New access to 1,3-dialkyl-2,3-dihydro-2-imino-1H-imidazoles and their application to the first total synthesis of naamine B, a marine 2,3-dihydro-2-imino-1,3-dimethyl-1H-imidazole alkaloid
作者:Ikuo Kawasaki、Seikou Nakamura、Satomi Yanagitani、Akiko Kakuno、Masayuki Yamashita、Shunsaku Ohta
DOI:10.1039/b108762b
日期:2001.11.29
1,3-Dialkyl-2,3-dihydro-2-imino-1H-imidazole derivatives are synthesized in 49–86% yield by treatment of 1,3-dialkyl-2-(phenylsulfanyl)imidazolium salts with primary carbamates or amides in the presence of a base such as LDA or NaH, and the first total synthesis of naamine B, a marine 2-imino-2,3-dimethyl-1,3-dihydro-1H-imidazole alkaloid, is achieved by application of this reaction as a key step.
在 LDA 或 NaH 等碱存在下,用伯氨基甲酸酯或酰胺处理 1,3-二烷基-2,3-二氢-2-亚氨基-1H-咪唑鎓盐,可合成 1,3-二烷基-2,3-二氢-2-亚氨基-1H-咪唑衍生物,收率为 49-86%、并以该反应为关键步骤,首次全合成了呐胺 B(一种海洋 2-亚氨基-2,3-二甲基-1,3-二氢-1H-咪唑生物碱)。