Leaving Group and Regioselectivity Switches in the Aminoalkylation Reaction of Indoles and Related Heterocycles with α-Amido Sulfones
作者:Gonzalo Blay、Rosa M. Girón、Marc Montesinos-Magraner、José R. Pedro
DOI:10.1002/ejoc.201300369
日期:2013.6
The regioselective aminoalkylation of indoles and related heterocycles with α-amido sulfones under basic conditions has been studied. The reaction that employed the MeMgBr/MgBr2 system provided high yields of 3-(1-carbamoylalkyl)indoles. On the other hand, the reaction that used Cs2CO3 afforded 1-(1-carbamoylalkyl)indoles exclusively in high yields. The first reaction constitutes a switch of the leaving
研究了在碱性条件下用 α-酰氨基砜对吲哚和相关杂环进行区域选择性氨烷基化。采用 MeMgBr/MgBr2 系统的反应提供了高产率的 3-(1-氨基甲酰基烷基)吲哚。另一方面,使用 Cs2CO3 的反应仅以高产率提供 1-(1-氨基甲酰基烷基)吲哚。与之前报道的吲哚和 α-酰氨基砜之间的反应相比,第一个反应构成了 α-酰氨基砜的离去基团的转换,后者提供了 3-(1-芳基磺酰基烷基)吲哚。第二个反应构成了区域选择性的转换。还研究了从吡咯和 7-氮杂吲哚开始的这些 C-和 N-氨基烷基化的延伸。结构多样的氨基烷基化吲哚、吡咯、