[CH3:1][S:2][C:3]1[S:4][C:5]([C:21]([OH:23])=O)=[C:6]2[CH2:14][CH2:13][C:12]3[CH:11]=[C:10]([C:15]4[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=4)[S:9][C:8]=3[C:7]=12.O1C=C[N:26]=C1Cl>O1CCCC1.CN(C)C=O>[CH3:1][S:2][C:3]1[S:4][C:5]([C:21]([NH2:26])=[O:23])=[C:6]2[CH2:14][CH2:13][C:12]3[CH:11]=[C:10]([C:15]4[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=4)[S:9][C:8]=3[C:7]=124,5-Dihydro-8-methylthio-2-phenylbenzo[2,1-c:3,4-b']dithiophene-6-carboxylic acid (0.50 g) was dissolved in tetrahydrofuran (10 ml); oxazolyl chloride (0.15 ml) and then N,N-dimethylformamide (one drop) were added. After the mixture was stirred at room temperature for 2 hours, it was concentrated under reduced pressure. The residue was dissolved in tetrahydrofuran (30 ml); concentrated aqueous ammonia (5 ml) was added. After the reaction mixture was stirred at room temperature for one hour, it was poured over water and extracted with chloroform-methanol. The organic layer was washed with water and dried (MgSO4), after which the solvent was distilled off to yield 4,5-dihydro-8-methylthio-2-phenylbenzo[2,1-c:3,4-b']dithiophene-6-carboxamide (0.28 g, 56%), which was recrystallized from ethanol. Melting point 192-193° C.
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