It is presented that hexahydro-1,5-methano[4,3-b]indoles were efficiently synthesized in high yields (up to 89% yield) through the cyclization reaction of starting tetrahydrocarbazoles bearing a monoalkylaminocarbonylmethyl moiety at the C-2 position mediated by 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ). A mechanistic proposal is also given that mainly includes two cascade reactions: (i) formation
结果表明,通过在C-2位介导的具有单烷基
氨基羰基甲基部分的起始四氢
咔唑的环化反应,可以高收率(高达89%的收率)有效地合成六氢-1,5-甲基[4,3- b ]
吲哚。 2,3-二
氯-5,6-二
氰基苯并醌(
DDQ)。一种机械的提案也考虑到主要包括两个级联反应:(ⅰ)通过的四氢
咔唑功能和(ii)
DDQ介导的脱氢形成插烯
亚胺阳离子的帧内-分子和合成选择性地将酰胺官能团作为亲核试剂添加到
乙烯基亚胺基阳离子上。此外,该环化反应已成功地用于(±)-精
氨酸(一种Asperspermatan骨架型
生物碱)的正式全合成中。