反应详情

A solution of 4-methyl-7-[methyl(2-thienylsulfonyl)amino]-1H-indole-2-carbothioamide (1.62 g), ethyl but-2-ynoate (1.2 mL) and tributylphosphine (1.1 mL) in a mixed solvent of tetrahydrofuran (30 mL)-toluene (20 mL) was stirred at room temperature for 4 hr. The reaction solution was concentrated under reduced pressure, and the obtained residue was subjected to silica gel column chromatography (ethyl acetate:hexane=10:90-35:65). The obtained crystals were crystallized from ethyl acetate-hexane to give the title compound (1.35 g, yield: 64%) as pale-yellow crystals. MS:478(MH+). melting point 109-110° C.

1. concentrationThe reaction solution was concentrated under reduced pressure
2. customThe obtained crystals were crystallized from ethyl acetate-hexane