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。