Water → HCID 67432761, compound

HRID 237218Notes

Reaction equation

HRID 237218 reaction equation
[Si:1]([O:8][C:9]1[CH:14]=[CH:13][C:12]([C:15]2[N:16]=[C:17]([C:22]3[S:32][C:25]4[C:26]5[S:31][CH:30]=[CH:29][C:27]=5[S:28][C:24]=4[CH:23]=3)[C:18]([NH2:21])=[N:19][CH:20]=2)=[CH:11][CH:10]=1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[Si:33]([O:40][C:41]1[CH:46]=[CH:45][C:44]([CH2:47][C:48](Cl)=[O:49])=[CH:43][CH:42]=1)([C:36]([CH3:39])([CH3:38])[CH3:37])([CH3:35])[CH3:34].O>CN(C)C1C=CN=CC=1.N1C=CC=CC=1>[Si:33]([O:40][C:41]1[CH:42]=[CH:43][C:44]([CH2:47][C:48]([NH:21][C:18]2[C:17]([C:22]3[S:32][C:25]4[C:26]5[S:31][CH:30]=[CH:29][C:27]=5[S:28][C:24]=4[CH:23]=3)=[N:16][C:15]([C:12]3[CH:11]=[CH:10][C:9]([O:8][Si:1]([C:4]([CH3:6])([CH3:7])[CH3:5])([CH3:2])[CH3:3])=[CH:14][CH:13]=3)=[CH:20][N:19]=2)=[O:49])=[CH:45][CH:46]=1)([C:36]([CH3:39])([CH3:38])[CH3:37])([CH3:35])[CH3:34]

Participants

6

Reactant 3

HCID 962WaterHCID 121887072-[4-(Tert-butyldimethylsilyloxy)phenyl]acetyl chlorideHCID 67430411HCID 67430411, compound

Product 1

HCID 67432761HCID 67432761, compoundYield 20.9%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 1049PyridineSolvent

Conditions

Temperature
50 °C

Procedure

Under an argon atmosphere, to a mixture of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(thieno[3,2-b:2′,3′-d]thiophen-2-yl)pyrazin-2-amine (7l) (370 mg, 746 μmol) and 4-(dimethylamino)pyridine (14.8 mg, 121 μmol) dissolved in anhydrous pyridine (15 mL) was added 2-[4-(tert-butyldimethylsilyloxy)phenyl]acetyl chloride (10) prepared above at 0° C. and the mixture was heated with stirring at 50° C. for 20 hours. After cooling to room temperature, to this was added water and the product was extracted with ethyl acetate (100 mL×3). The combined organic extract was washed successively with water (200 mL) and brine (200 mL), followed by drying over anhydrous sodium sulfate. After filtration and concentration under reduced pressure, the residue was purified by column chromatography (silica gel 50 g, n-hexane/ethyl acetate=3/1). The resulting solid was recrystallized (n-hexane/ethyl acetate) to give Compound 11l (116 mg, 156 μmol, 20.9%) as a brown solid. Rf=0.19 (n-hexane/ethyl acetate=3/1); 1H NMR (400 MHz, DMSO-d6) δ 0.16 (s, 6H), 0.21 (s, 6H), 0.93 (s, 9H), 0.94 (s, 9H), 3.68 (s, 2H), 6.78-6.88 (AA′BB′, 2H), 6.94-7.06 (AA′BB′, 2H), 7.20-7.30 (AA′BB′, 2H), 7.47 (d, 1H, J=5.2 Hz), 7.65 (s, 1H), 7.75 (d, 1H, J=5.2 Hz), 8.06-8.14 (AA′BB′, 2H), 8.93 (s, 1H), 10.72 (s, 1H); IR (KBr, cm−1) 530, 602, 644, 700, 779, 837, 922, 1072, 1171, 1265, 1361, 1447, 1504, 1603, 1657, 2857, 2928, 2955, 3208.

Workup

  1. customprepared above at 0° C.
  2. temperaturethe mixture was heated
  3. temperatureAfter cooling to room temperature
  4. extractionthe product was extracted with ethyl acetate (100 mL×3)
  5. extractionThe combined organic extract
  6. washwas washed successively with water (200 mL) and brine (200 mL)
  7. dry with materialby drying over anhydrous sodium sulfate
  8. filtrationAfter filtration and concentration under reduced pressure
  9. customthe residue was purified by column chromatography (silica gel 50 g, n-hexane/ethyl acetate=3/1)
  10. customThe resulting solid was recrystallized (n-hexane/ethyl acetate)

Sources & evidence

ORD record
ord-c0235be3b9134af8af52adbe991281c3
Source dataset
uspto-grants-2014_02
Patent number
US08642281B2

Reaction notes

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