Tandem Condensation/Rearrangement Reaction of 2-Aminohetarene<i>N</i>-Oxides for the Synthesis of Hetaryl Carbamates
作者:Dmitry M. Bystrov、Egor S. Zhilin、Leonid L. Fershtat、Anna A. Romanova、Ivan V. Ananyev、Nina N. Makhova
DOI:10.1002/adsc.201800407
日期:2018.8.17
A new approach to hetaryl carbamates through a tandem condensation/rearrangement reaction of 2‐aminohetarene N‐oxides was developed. The developed reaction is suitable for both five‐ and six‐membered heterocycles and proceeds through the condensation of 2‐aminohetarene N‐oxide with trimethyl orthoformate followed by intramolecular N‐oxide oxygen transfer. For five‐membered hetarene N‐oxides (furoxans)
通过2-氨基戊烯N-氧化物的串联缩合/重排反应,开发了一种氨基甲酸杂芳基酯的新方法。发达的反应适用于五元和六元杂环,并通过2-氨基戊烯N-氧化物与原甲酸三甲酯的缩合反应进行,然后进行分子内N-氧化物氧转移。对于五元戊烯氮氧化物(呋喃喃),分子内的重排由氰化物阴离子催化,而对于六元戊烯氮氧化物(嗪),路易斯酸催化就足够了。所开发的方案的特征在于操作简单和高效率,从而以良好和高收率得到氨基甲酰基衍生物。