Methyl 2-isocyano-3-[3 (1H)-indolyl] acrylate (1) was synthesized in 73-75% yield by the reaction of 3-(aminomethylene)-3H-indoles (5) with methyl α-isocyanoacetate (3) in pyridine or dimethylformamide, while the reaction in methanol afforded selectively 2-(aminomethyleneamino)-3-[3 (1H)-indolyl] acrylates (6a-e) in 63-100% yields. The mechanisms of formation of 1 and 6 are discussed. Both 1 and 6a-e were hydrolyzed to N-formyl-α, β-dehydrotryptophan (8) and/or its methyl ester (2).
3-(aminomethylene)-3H-indoles (5) 与 α-isocyanoacetate (3) 甲基在
吡啶或二甲基甲酰胺中反应合成了 2-异
氰基-3-[3 (1H)-indolyl]
丙烯酸甲酯 (1),收率为 73-75%;而在
甲醇中反应则可选择性地得到 2-(aminomethyleneamino)-3-[3 (1H)-indolyl]
丙烯酸酯 (6a-e),收率为 63-100%。本文讨论了 1 和 6 的形成机理。1 和 6a-e 都被
水解为 N-甲酰基-α,β-脱氢色
氨酸(8)和/或其甲酯(2)。