反应详情

A 2.00 g (12.69 mmoles) sample of 3-methoxy-2-thiophenecarboxylic acid (prepared according to Gronowitz, S., Arkiv. for Kemi. 12:239 (1958)) was reacted with 10 ml of thionyl chloride according to Example 32. Evaporation of excess thionyl chloride left 2.17 g of 3-methoxy-2-thiophenecarbonyl chloride as a crystalline solid, m.p. 86°-88° C. The acid chloride was coupled to 2.16 g (10.24 mmoles) of 5-chloro-2-oxindole-1-carboxamide in the presence of 3.30 g (27 mmoles) 4-(N,N-dimethylamino)pyridine according to the procedure in Example 32. Aqueous acid quench followed by filtration gave a yellow solid which was purified by recrystallization to give 1.04 g (2.96 mmoles, 29% yield) of 5-chloro-3-(3-methoxy-2-thenoyl)-2-oxindole-1-carboxamide as a yellow solid, m.p. 272°-274° C. (acetic acid).

1. customEvaporation of excess thionyl chloride
2. waitleft 2.17 g of 3-methoxy-2-thiophenecarbonyl chloride as a crystalline solid, m.p. 86°-88° C
3. customAqueous acid quench
4. filtrationfollowed by filtration
5. customgave a yellow solid which
6. customwas purified by recrystallization