2. Debate teórico-conceptual
2.1. La configuración de la actividad informal
Synthesis of Compound 3.1a.Poly(ethylene glycol) monomethylether (PEGMME) (2000
g/mol) (5.00 g, 2.5 mmol, 1.0 equiv) and succinic anhydride (2.50 g, 25 mmol, 10 equiv) were dissolved in 50 mL of dry CH2Cl2 and stirred at room temperature for 5 min. NEt3
(7.0 mL, 50 mml, 20 equiv) and DMAP (0.32 g, 2.5 mmol, 1 equiv) were added and the solution was refluxed at 45˚C for 24 h. The reaction mixture was diluted with CH2Cl2 and
poured over 1:1 1M HCl:brine. The product was re-extracted from the aqueous layer 5 times using CH2Cl2. The combined organic layers were dried over MgSO4, filtered, and
concentrated in vacuo. The crude product was then dissolved in 10 mL of DMF and dialyzed against DMF for 24 h (1 L, 1 solvent change) using a regenerated cellulose membrane (3500 g/mol MWCO). The contents of the dialysis membrane were then concentrated in vacuo and lyophilized to afford compound 3.1a (4.12 g, 78%). 1H NMR (CDCl3, 600 MHz): δ 4.28-4.23 (m, 2H), 3.89-3.43 (m, 170H), 3.37 (s, 3H), 2.68-2.58
(m, 6H).
Synthesis of Compound 3.1b.Compound 3.1b was synthesized using an identical
procedure to 3.1a except that 5000 g/mol molecular weight PEGMME was used in place of 2000 g/mol molecular weight PEGMME. The quantities of reagents used were
PEGMME (5000 g/mol) (4.99 g, 1.0 mmol, 1.0 equiv), succinic anhydride (1.00 g, 10 mmol, 10 equiv), NEt3 (2.0 mL, 20 mmol, 20 equiv), and DMAP (0.13 g, 1 mmol, equiv).
The crude product was purified through dialysis against DMF using a regenerated
cellulose membrane (3500 g/mol MWCO) and lyophilized to afford compound 3.1a (4.34 g, 85%). 1H NMR (CDCl
3, 600 MHz): δ 4.25-4.22 (m, 2H), 3.81-3.44 (m, 574H), 3.36 (s,
3H), 2.66-2.58 (m, 6H).
Synthesis of Compound 3.2a. Compound 3.1a (2.96 g, 1.41 mmol, 1.0 equiv) was
dissolved in 30 mL of dry CH2Cl2. Pyridine (3.10 mL, 28.2 mmol, 20 equiv) and 4-
nitrophenyl chloroformate (2.85 g, 14.2 mmol, 10 equiv) were successively added and the solution was stirred at room temperature for 24 h. The reaction mixture was diluted with CH2Cl2 and poured over 1:1 1M HCl:brine. The product was re-extracted from the
aqueous layer 5 times using CH2Cl2. The combined organic layers were dried over
MgSO4, filtered, and concentrated in vacuo to a volume of approximately 5 mL. The
crude product was then precipitated out of 300 mL of cold Et2O to afford 3.2a (2.80 g,
89%). 1H NMR (CDCl3, 600 MHz): δ 8.24 (m, 2H), 7.28 (m, 2H), 4.29-4.23 (m, 2H),
3.83-3.40 (m, 180H), 3.65 (s, 3H), 2.92-2.85 (m, 2H), 2.81-2.74 (m, 2H). MS (MALDI- TOF) [M+Na]+: 1904.9.
Synthesis of Compound 3.2b. Compound 3.2b was synthesized using an identical
procedure to 3.2a. The quantities of reagents used were 3.1b (4.08 g, 0.80 mmol, 1 equiv), 4-nitrophenyl chloroformate (1.61 g, 8.0 mmol, 10 equiv), and pyridine (1.74 mL, 16.0 mmol, 20 equiv). The crude product was precipitated out of 500 mL of cold Et2O to
afford 3.2b (3.85 g, 92%). 1H NMR (CDCl3, 600 MHz): δ 8.25 (m, 2H), 7.29 (m, 2H),
4.28-4.26 (m, 2H), 3.77-3.48 (m, 591H), 3.36 (s, 3H), 2.92-2.88 (m, 2H), 2.81-2.76 (m, 2H).
Synthesis of Compound 3.4a. Compound 3.2a (2.72 g, 1.22 mmol, 1.0 equiv) was
dissolved in 30 mL of dry CH2Cl2. NEt3 (3.40 mL, 24.4 mmol, 20 equiv) and 3.3 (2.95 g,
12.4 mmol, 10 equiv) were successively added and the solution was stirred at room temperature for 24 h. The reaction mixture was diluted with CH2Cl2 and poured over 1:1
Cl2. The combined organic layers were dried over MgSO4, filtered, and concentrated in
vacuo to a volume of approximately 5 mL. The crude product was then precipitated out
of 300 mL of cold Et2O to afford 3.4a (2.17 g, 77%). 1H NMR (CDCl3, 600 MHz): δ 7.28
(m, 2H), 7.01 (m, 2H), 4.69 (s, 2H), 4.27-4.21 (m, 2H), 3.86-3.41 (m, 190H), 3.35 (s, 3H), 2.88-2.82 (m, 2H), 2.78-2.70 (m, 2H). MS (MALDI-TOF) [M+Na]+: 2092.2.
Synthesis of Compound 3.4b. Compound 3.4b was synthesized using an identical
procedure to 3.4a. The quantities of reagents used were 3.2b (4.08 g, 0.80 mmol, 1 equiv), 3.3 (1.88 g, 7.8 mmol, 10 equiv) and NEt3 (2.20 mL, 15.7 mmol, 20 equiv). The
crude product was precipitated out of 400 mL of cold Et2O to afford 3.4b (3.47 g, 86%). 1H NMR (CDCl
3, 600 MHz): δ 7.30 (m, 2H), 7.03 (m, 2H), 4.70 (s, 2H), 4.28-4.24 (m,
2H), 3.82-3.47 (m, 590H), 3.37 (s, 3H), 2.89-2.84 (m, 2H), 2.78-2.74 (m, 2H).
Synthesis of Compound 3.5a. Compound 3.4a (2.12 g, 0.91 mmol, 1.0 equiv) was
dissolved in 25 mL of 1% HCl in 3:1 EtOH:CH2Cl2 and stirred at room temperature for 1
h. The reaction mixture was diluted with CH2Cl2 and poured over saturated NaHCO3. The
product was re-extracted from the aqueous layer 5 times using CH2Cl2. The combined
organic layers were dried over MgSO4, filtered, and concentrated in vacuo to a volume of
approximately 5 mL. The crude product was then precipitated out of 300 mL of cold Et2O
to afford 3.5a (1.50 g, 75%). 1H NMR (CDCl3, 600 MHz): δ 7.36 (m, 2H), 7.06 (m, 2H),
4.65 (s, 2H), 4.29-4.23 (m, 2H), 3.83-3.40 (m, 181H), 3.36 (s, 3H), 2.90-2.83 (m, 2H), 2.79-2.73 (m, 2H). MS (MALDI-TOF) [M+Na]+: 2066.1.
Synthesis of Compound 3.5b. Compound 3.5b was synthesized using an identical
procedure to 3.5a. The quantities of reagents used were 3.4b (3.54 g, 0.67 mmol, 1 equiv). The crude product was precipitated out of 400 mL of cold Et2O to afford 3.5b
(2.84 g, 81%). 1H NMR (CDCl3, 600 MHz): δ 7.29 (m, 2H), 7.02 (m, 2H), 4.70 (s, 2H),
4.28-4.23 (m, 2H), 3.81-3.45 (m, 558H), 3.36 (s, 3H), 2.89-2.83 (m, 2H), 2.79-2.72 (m, 2H).
Synthesis of Compound 3.6a. Compound 3.5a (0.50 g, 0.23 mmol, 1.0 equiv) was
dissolved in 8 mL of dry CH2Cl2. Pyridine (0.40 mL, 4.6 mmol, 20 equiv) and 4-
reaction mixture was stirred at room temperature for 24 h. The reaction mixture was diluted with CH2Cl2 and poured over 1:1 1M HCl:brine. The product was re-extracted
from the aqueous layer 5 times using CH2Cl2. The combined organic layers were dried
over MgSO4, filtered, and concentrated in vacuo to a volume of approximately 3 mL. The
crude product was then precipitated out of 80 mL of cold Et2O to afford 3.6a (0.44 g,
86%). 1H NMR (CDCl
3, 600 MHz): δ 8.26 (m, 2H), 7.45 (m, 2H), 7.37 (m, 2H), 7.14 (m,
2H), 5.27 (s, 2H), 4.29-4.24 (m, 2H), 3.84-3.41 (m, 191H), 3.37 (s, 3H), 2.92-2.84 (m, 2H), 2.80-2.73 (m, 2H). MS (MALDI-TOF) [M+Na]+: 2231.2.
Synthesis of Compound 3.6b. Compound 3.6b was synthesized using an identical
procedure to 3.6a. The quantities of reagents used were 3.5b (0.99 g, 0.19 mmol, 1 equiv), pyridine (0.31 mL, 3.8 mmol, 20 equiv), and 4-nitrophenyl chloroformate (0.38 g, 1.9 mmol, 10 equiv). The crude product was precipitated out of 100 mL of cold Et2O to
afford 3.6b (0.85 g, 83%).1H NMR (CDCl3, 600 MHz): δ 8.25 (m, 2H), 7.44 (m, 2H),
7.36 (m, 2H), 7.13 (m, 2H), 5.26 (s, 2H), 4.28-4.23 (m, 2H), 3.84-3.41 (m, 566H), 3.35 (s, 3H), 2.90-2.84 (m, 2H), 2.79-2.73 (m, 2H).
Synthesis of Polymer 3.7a. Activated monomer 2.1c19 (1.02 g, 2.0 mmol, 1.0 equiv) was
dissolved in 3 mL of 1:1 TFA:CH2Cl2 and stirred at room temperature for 2 h. The
solvent was then removed under a stream of nitrogen in the fume hood prior to subjecting the reaction mixture three times to a repeat cycle of dilution with CH2Cl2 followed by
concentration under reduced pressure to remove residual TFA and provide the
deprotected monomer 2.5.19 End-cap 3.6a (0.22 g, 0.10 mmol, 0.05 equiv) was added and the resulting mixture was dissolved in 8 mL of anhydrous toluene and stirred at room temperature for 5 min. NEt3 (1.4 mL, 10 mmol, 5.0 equiv) and DMAP (62 mg, 0.50
mmol, 0.25 equiv) were sequentially added and the solution was then cooled to -15˚C and stirred for 24 h. The solution was then warmed to room temperature and stirred for an additional 36 h. The reaction mixture was diluted with CH2Cl2 and poured over 1:1 1 M
citric acid:brine and extracted from the aqueous layer 5 times with CH2Cl2. The
combined organic layers were then washed with saturated NaHCO3 and extracted from
the aqueous layer an additional 5 times with CH2Cl2. The combined organic layers were
in 2 mL of DMF and dialyzed against DMF for 24 h (200 mL, 1 solvent change) using a regenerated cellulose membrane (25000 g/mol MWCO). The contents of the dialysis membrane were then concentrated in vacuo and lyophilized to afford polymer 3.7a (0.29 g, 40%). 1H NMR indicated a degree of polymerization of ∼ 18 by integrating the
benzylic peak against the PEG end-cap. 1H NMR (CDCl3, 600 MHz): δ 7.44-7.28 (br,
36H), 7.14-7.00 (br, 35H), 5.16-5.04 (m, 35 H), 4.29-4.25 (m, 2H), 3.81-3.40 (m, 369H), 3.38 (s, 4H), 3.21-2.84 (m, 102H), 2.80-2.74 (m, 2H).SEC: Mn=3600g/mol, Mw=5290
g/mol, PDI=1.47 (PEG standards).
Synthesis of Polymer 3.7b. Activated monomer 2.1c19 (1.02 g, 2.0 mmol, 1.0 equiv) was
dissolved in 3 mL of 1:1 TFA:CH2Cl2 and stirred at room temperature for 2 h. The
solvent was then removed under a stream of nitrogen in the fume hood prior to subjecting the reaction mixture three times to a repeat cycle of dilution with CH2Cl2 followed by
concentration under reduced pressure to remove residual TFA and provide the
deprotected monomer 2.5.19 End-cap 3.6b (0.51 g, 0.10 mmol, 0.05 equiv) was added and the resulting mixture was dissolved in 8 mL of anhydrous toluene and stirred at room temperature for 5 min. NEt3 (1.4 mL, 10 mmol, 5.0 equiv) and DMAP (62 mg, 0.50
mmol, 0.25 equiv) were sequentially added and the solution was stirred at -15˚C for 24 h. The reaction was then warmed to room temperature and stirred for an additional 36 h. The reaction mixture was diluted with CH2Cl2 and poured over 1:1 1M citric acid:brine
and extracted from the aqueous layer 5 times with CH2Cl2. The combined organic layers
were then washed with saturated NaHCO3 and extracted from the aqueous layer an
additional 5 times with CH2Cl2. The combined organic layers were dried over MgSO4,
filtered, and concentrated in vacuo. The crude polymer was dissolved in 2 mL of DMF and dialyzed against DMF for 24 h (200 mL, 1 solvent change) using a regenerated cellulose membrane (25000 g/mol MWCO). The contents of the dialysis membrane were then concentrated in vacuo and lyophilized to afford polymer 3.7b (0.55 g, 51%). 1H
NMR indicated a degree of polymerization of ∼ 10 by integrating the benzylic peak against the PEG end-cap. 1H NMR (CDCl
3, 600 MHz): δ 7.41-7.27 (br, 20H), 7.12-7.00
3.16-2.83 (m, 56H), 2.79-2.74 (m, 2H). SEC: Mn=7170g/mol, Mw=8650g/mol,
PDI=1.21 (PEG standards).
Synthesis of Compound 3.11.Compound 3.835 (0.88 g, 2.9 mmol, 1.4 equiv) was
dissolved in 3 mL of 1:1 TFA:CH2Cl2 and stirred at room temperature for 2 h. The
solvent was then removed under a stream of nitrogen in the fume hood prior to subjecting the reaction mixture three times to a repeat cycle of dilution with CH2Cl2 followed by
concentration under reduced pressure to remove residual TFA and provide the Boc- deprotected compound 3.9. Compound 3.10 (2.0 mmol, 1.0 equiv) was added and the resulting mixture was dissolved in 10 mL of anhydrous toluene. DIPEA (1.80 mL, 10.3 mmol, 5.3 equiv) and DMAP (40 mg, 0.4 mmol, 0.2 equiv) were successively added to the reaction flask and the solution was stirred at room temperature overnight. The reaction mixture was diluted with CH2Cl2 and washed once with 1 M HCl, twice with 1
M Na2CO3, and once with brine. The organic layer was then dried over MgSO4, filtered,
and concentrated in vacuo. The resulting oil was purified through silica gel
chromatography (1:9 EtOAc:CH2Cl2) to afford compound 3.11 as a pale yellow oil (0.65
g, 71%). 1H NMR (CDCl3, 600 MHz): δ 8.49 (d, J=4.8, 1H), 7.74-7.59 (m, 2H), 7.29 (m,
2H), 7.12-7.09 (m, 1H), 7.08-7.00 (m, 2H), 4.71 (s, 2H), 3.76 & 3.66 (m, rotamers, 2H), 3.14 & 3.03 (m, rotamers, 3H), 3.10-3.03 (m, 2H), 0.93 (s, 9H), 0.09 (s, 6H). 13C NMR (CDCl3, 100 MHz): δ 159.8, (154.9 &154.7, rotamers), (150.2 & 149.9, rotamers), 138.5,
137.2, 127.0, 121.5, 121.4, (121.0 & 120.9, rotamers), (120.1 & 120.0, rotamers), 64.6, (49.0 & 48.4, rotamers),(36.6, 36.1, & 35.9, rotamers), 26.0, 18.5, -5.1. FT-IR
(νmax/cm−1): 2955, 2930, 2885, 2856, 1722, 1574, 1562, 1510. HRMS: calcd [M]+
(C22H32N2O3S2Si): 464.1624. Found (EI): 464.1619.
Synthesis of Compound 3.12. Compound 3.11 (0.49 g, 1.1 mmol, 1 equiv) was dissolved
in 4 mL of 1% HCl in EtOH and stirred at room temperature for 1.5 h. The reaction mixture was diluted with CH2Cl2 and washed with saturated NaHCO3. The organic layer
was then dried over MgSO4, filtered, and concentrated in vacuo. The resulting oil was
purified through silica gel chromatography (2:3 EtOAc:CH2Cl2) to afford compound 3.12
as a pale yellow oil (0.33 g, 88%). 1H NMR (CDCl3, 600 MHz): δ 8.48 (d, J=5.0, 1H),
3.77 & 3.67 (m, rotamers, 2H), 3.14 & 3.03 (m, rotamers, 3H), 3.09-3.03 (m, 2H). 13C NMR (CDCl3, 100 MHz): δ (159.7 & 159.5, rotamers), (154.9 & 154.6, rotamers),
(150.6 & 150.5, rotamers), 138.3, 137.2, 127.9, (121.7 &121.6, rotamers), (121.0 & 120.9, rotamers), (120.1 & 120.0, rotamers), 64.5, (48.9 & 48.3, rotamers), (36.5 & 36.0, rotamers), (35.9 & 35.5). FT-IR (νmax/cm−1): 2926, 2870, 1717, 1576, 1562, 1510.
HRMS: calcd [M]+ (C
16H18N2O3S2): 350.0759. Found (EI): 350.0768.
Synthesis of Compound 3.13. Compound 3.12 (0.25 g, 0.64 mmol, 1.0 equiv) was
dissolved in 4 mL of dry CH2Cl2. Pyridine (0.16 mL, 1.9 mmol, 2.0 equiv) and 4-
nitrophenyl chloroformate (0.26 g, 1.3 mmol, 2.0 equiv) were successively added to the reaction flask and the solution was stirred for 1.5 h at room temperature until completion as determined by TLC. The reaction mixture was diluted with CH2Cl2 and washed with
1M HCl followed by saturated NaHCO3. The organic layer was then dried over MgSO4,
filtered, and concentrated in vacuo. The resulting oil was purified through silica gel chromatography (CH2Cl2, then 1:9 EtOAc:CH2Cl2) to afford compound 3.13 as a pale
yellow oil (0.31 g, 92%). 1H NMR (CDCl3, 600 MHz): δ 8.46 (d, J=4.2, 1H), 7.70-7.59
(m, 2H), 7.45-7.39 (m, 2H), 7.35 (m, 2H), 7.15 (m, 2H), 7.13-7.07 (m, 2H), 5.25 (s, 2H), 3.77 & 3.66 (m, rotamers, 2H), 3.13 & 3.02 (m, roatmers, 3H), 3.08-3.03 (m, 2H).
13C NMR (CDCl
3, 100 MHz): (159.9 & 159.4, rotamers), 155.5, (154.5 & 154.2,
rotamers), 152.4, 151.9, (149.9 & 149.8, rotamers), 145.5, 137.1, 131.2, 130.0, 125.3, (122.1 &122.0, rotamers), 121.9, (121.0 & 120.9, rotamers), (120.1 & 120.0, rotamers), 70.4, (48.9 & 48.2, rotamers), (36.4 & 36.0, rotamers), (35.9 & 35.4, rotamers). FT-IR (νmax/cm−1): 3117, 3080, 3047, 2957, 2930, 1767, 1720, 1616, 1593, 1574, 1562, 1524.
HRMS: calcd [M]+ (C23H21N3O7S2): 515.0821. Found (EI): 515.0845.
Synthesis of Polymer 3.14. Activated monomer 2.1c19 (0.67 g, 1.3 mmol, 1.0 equiv) was
dissolved in 3 mL of 1:1 TFA:CH2Cl2 and stirred at room temperature for 2 h. The
solvent was then removed under a stream of nitrogen in the fume hood prior to subjecting the reaction mixture three times to a repeat cycle of dilution with CH2Cl2 followed by
concentration under reduced pressure to remove residual TFA and provide the
deprotected monomer 2.5.19 End-cap 3.13 (30 mg, 0.07 mmol, 0.05 equiv) was added and the resulting mixture was dissolved in 4.4 mL of anhydrous toluene and cooled to 0˚C.
NEt3 (0.92 mL, 6.6 mmol, 5.0 equiv) and DMAP (33 mg, 0.27 mmol, 0.2 equiv) were
sequentially added and the solution was stirred at 0˚C for 8h, let warm to room temperature, and stirred an additional 16 h. The solvent was then evaporated under reduced pressure and the crude polymer was dissolved in 2 mL of DMF and dialyzed against DMF for 24 h (200, mL, 1 solvent change) using a regenerated cellulose membrane (12000-14000 g/mol MWCO). The contents of the dialysis membrane were then concentrated in vacuo and lyophilized to afford polymer 3.14 (0.21 g, 60%). 1H
NMR indicated a degree of polymerization of ∼ 25 by integrating the benzylic peak against the thiopyridyl end-cap. 1H NMR (CDCl3, 400 MHz): δ 8.46 (d, J=5.3, 1H), 7.70-
7.59 (m, 2H), 7.40-7.27 (br, 48H), 7.11-6.99 (br, 50H), 5.14-5.01 (m, 48H), 3.62-3.37 (m, 94H), 3.75 & 3.65 (m, rotamers, 2H), 3.16-2.83 (m, 209H). SEC: Mn=3150g/mol,
Mw=5440g/mol, PDI=1.73 (PEG-PEO standards). Mn=5580g/mol, Mw=9720g/mol,
PDI=1.74 (PEG-PEO standards).
Synthesis of Polymer 3.16. Poly(ethylene glycol) thioacetate derivative (5000 g/mol)
3.1736,37 (20 mg, 4 µmol, 0.6 equiv) was dissolved in 2 mL of 1:2 freshly distilled
CH2Cl2:MeOH and cooled to 0˚C. Polymer 3.14 (30 mg, 7 µmol, 1.0 equiv) and NaOMe
(6 mg, 0.1 mmol, 16 equiv) were added and the solution was stirred at 0˚C for 8 h and then stirred an additional 8 h at room temperature. The crude reaction mixture was concentrated in vacuo and then dissolved in CH2Cl2 and washed with a 1:1 mixture of 1
M HCl:brine. The product was re-extracted from the aqueous layer an additional 5 times with CH2Cl2. The combined organic layers were dried over MgSO4, filtered, and
concentrated in vacuo. The crude product was dissolved in 2 mL of DMF and dialyzed against DMF for 24 h (200 mL, 1 solvent change) using a regenerated cellulose
membrane (12000-14000 g/mol MWCO). The contents of the dialysis membrane were then concentrated in vacuo and lyophilized to afford polymer 3.16 (37 mg, 57%). 1H NMR indicated a degree of polymerization of ∼ 28 by integrating the benzylic peak against the PEG end-cap. 1H NMR (CDCl
3, 600 MHz): δ 7.39-7.27 (br, 56H), 7.11-6.95
(br, 56H), 5.16-5.02 (m, 57H), 3.78-3.41 (m, 644H), 3.37 (s, 3H), 3.16-2.84 (m, 179H). SEC: Mn=5200g/mol, Mw=7330g/mol, PDI=1.41 (PEG-PEO standards).
Synthesis of Compound 3.18. Compound 3.1738(0.40 g, 2.9 mmol, 1.0 equiv) and NEt3
(0.70 mL, 9.5 mmol , 3.3 equiv) were added to 10 mL of dry CH2Cl2 cooled to 0˚C. 4-
Nitrophenyl chloroformate (0.65 g, 3.2 mmol, 1.1 equiv) dissolved in 5 mL of CH2Cl2
was added dropwise to the reaction mixture over 20 min. The solution was warmed to room temperature and stirred an additional 1.5 h until completion as determined by TLC. Freshly distilled triethylene glycol monomethyl ether (0.36 mL, 1.3 mmol, 0.45 equiv) was added and the reaction was stirred for 30 min to quench the remaining 4-nitrophenyl chloroformate. The reaction mixture was diluted with CH2Cl2 and washed with 1 M HCl.
The organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The crude
solid was purified through silica gel chromatography (1:49 EtOAc:CH2Cl2) to afford 3.18
as a white solid (0.71 g, 80%). 1H NMR (CDCl3, 600 MHz): δ 8.28 (m, 2H), 7.45 (m,
2H), 7.37 (m, 2H), 7.23 (m, 2H), 4.44 (s, 2H), 3.37 (s, 3H). 13C NMR (CDCl3, 100 MHz): δ 155.3,151.0,150.1,145.6,128.9, 125.4, 121.8, 120.7, 73.9, 58.3. FT-IR (νmax/cm−1):
2928, 2854, 1763, 1726, 1618, 1595, 1526. HRMS: calcd [M]+ (C15H13NO6): 303.0743.
Found (EI): 303.0749.
Synthesis of Compound 3.19.Compound 3.9 was synthesized using the same procedure
outlined above. Compound 3.9 (0.24 g, 0.77 mmol, 1.5 equiv) and compound 3.18 (0.16 g, 0.51 mmol, 1.0 equiv)were dissolved in 5 mL of dry toluene. DIPEA (0.42 mL, 3.9 mmol, 5.0 equiv) and DMAP (20 mg, 0.15 mmol, 0.30 equiv) were successively added to the reaction flask and the solution was stirred at room temperature overnight. The
reaction mixture was then diluted with CH2Cl2 and washed with 1M HCl, followed by 1
M Na2CO3 and brine. The organic layer was dried over MgSO4, filtered, and concentrated
in vacuo. The resulting oil was purified through silica gel chromatography (3:20
EtOAc:CH2Cl2) to afford 3.19 as a pale yellow oil (0.13 g, 70%). 1H NMR (CDCl3, 600
MHz): δ 8.48 (d, J=5.3, 1H), 7.72-7.59 (m, 2H), 7.33-7.28 (m, 2H), 7.13-7.06 (m, 2H), 7.06-7.02 (d, J=8.0, 1H), 4.43 (s, 2H), 3.76 & 3.66 (m, rotamers, 2H), 3.36 (s, 3H), 3.14 & 3.02 (rotamers, 3H), 3.09-3.03 (m, 2H).13C NMR (CDCl
3, 100 MHz): δ (159.7 &
159.4, rotamers), (154.7 & 154.5, rotamers), 150.7, (149.8, & 149.7, rotamers), 137.1, 135.3, 128.6, 121.6, (121.0 & 120.9, rotamers), (120.0 & 119.9, rotamers), 74.1, (48.9 & 48.3, rotamers), (36.5 & 36.0, rotamers), (35.8, & 35.5, rotamers). FT-IR (νmax/cm−1):
2926, 2854, 2822, 1722, 1574, 1562, 1510. HRMS: calcd [M]+ (C17H20N2O3S2):
364.0915. Found (EI): 364.0916.
Synthesis of Compound 3.21.Compound 3.20 (0.14 g, 0.76 mmol, 1.5 equiv) and
compound 3.18 (0.15 g, 0.50 mmol, 1.0 equiv)were dissolved in 3 mL of dry toluene. DIPEA (0.26 mL, 1.5 mmol, 3.0 equiv) and DMAP (13 mg, 0.11 mmol, 0.21 equiv) were successively added to the reaction flask and the solution was stirred at room temperature overnight. The reaction mixture was then diluted with CH2Cl2 and washed with 1M HCl,
followed by 1 M Na2CO3 and brine. The organic layer was dried over MgSO4, filtered,
and concentrated in vacuo. The resulting oil was purified through silica gel
chromatography (3:20 EtOAc:CH2Cl2) to afford 3.20 as a pale yellow oil (0.16 g, 92%). 1H NMR (CDCl
3, 600 MHz): 7.32-7.28 (m, 2H), 7.10-7.05 (m, 2H), 4.42 (s, 2H), 3.61-
3.39 (m, methylenes, rotamers, 4H), 3.37-3.34 (m, 3H), 3.11 & 3.02 (rotamers, 3H), 2.94- 2.86 (m, rotamers, 3H), 1.50-1.40 (m, 9H).13C NMR (CDCl3, 100 MHz): δ (155.9, 155.7,
& 155.5, rotamers), (154.9 & 154.6, rotamers), (150.9 & 150.8, rotamers), (135.2 & 135.1, rotamers), 128.6, (121.8 & 121.6, rotamers), (79.9, 79.7, 79.6, & 79.5, rotamers), 74.1, 58.0, (47.4, 47.2, 47.0, 46.8, 46.6, 46.5, CH2 rotamers), (35.4 & 35.2, rotamers),
(34.7 & 34.6, rotamers), 28.4. FT-IR (νmax/cm−1): 2976, 2930, 1722, 1693, 1510. HRMS:
calcd [M]+ (C18H28N2O5): 352.1998. Found (EI): 352.1996.