One-Pot Hydrogen Peroxide and Hydrohalic Acid Induced Ring Closure and Selective Aromatic Halogenation To Give New Ring-Fused Benzimidazoles
作者:Michael Gurry、Martin Sweeney、Patrick McArdle、Fawaz Aldabbagh
DOI:10.1021/acs.orglett.5b01317
日期:2015.6.5
A new series of selectively dichlorinated and dibrominated five- to eight-membered-ring [1,2-a]-fused benzimidazoles and [1,4]oxazino[4,3-a]benzimidazoles are synthesized in mostly high yields of >80% using the reaction of hydrogen peroxide and hydrohalic acid with commercially available o-cyclic amine substituted anilines. Domestic bleach with HCl can also be used for a one-pot ring closure and chlorination
合成了一系列新的选择性二氯化和二溴化的五至八元环[1,2- a ]稠合的苯并咪唑和[1,4]恶嗪[4,3- a ]苯并咪唑,其大部分收率> 80使用过氧化氢和氢卤酸与可商购的o-环胺取代的苯胺的反应,得到%。含HCl的家用漂白剂也可用于一锅闭环和氯化。