Diborane as a reducing agent - VI the novel reduction of indole-1-carboxaldehydes to 1-methyl- indoles, di(indolyimethyl) ethers and indolylmethyl indolines
作者:Kshetra M. Biswas、Rabindranath Dhara、Sumita Roy、Haimanti Mallik
DOI:10.1016/s0040-4020(01)98809-x
日期:——
ether() and the indolenine () as the minor products, except . This appears to be the first report on the formation of symmetric ethers in the borane/THF reduction of an oxygen function. The formation of and from and implies that electrophilic substitution takes place primarily at position 3 of 3-substituted indoles, did not form the corresponding probably because of steric hindrance. These results are
用硼烷/ THF还原吲哚-1-甲醛(- )可以以42-91%的收率得到1-甲基吲哚()以及不对称的二(吲哚基甲基)醚()和吲哚基甲基二氢吲哚()。次要产品为ether()和indolenine(),但除外。这似乎是关于氧官能团的硼烷/ THF还原中形成对称醚的第一个报道。的形成和从和意味着电取代主要发生在3-取代的吲哚3位,不形成相应的可能是因为位阻。讨论了有关硼烷/ THF还原的机理,不同产物的来源以及3-取代吲哚中的亲电子取代的结果。