Regioselective oxidative cross-coupling of benzo[d]imidazo[2,1-b]thiazoles with styrenes: a novel route to C3-dicarbonylation
作者:Siddiq Pasha Shaik、Faria Sultana、A. Ravikumar、Satish Sunkari、Abdullah Alarifi、Ahmed Kamal
DOI:10.1039/c7ob01778b
日期:——
A novel I2 promoted, highly efficient metal-free and peroxide-free greener domino protocol for the C3-dicarbonylation of benzo[d]imidazo[2,1-b]thiazoles (IBTs) with styrenes has been developed via oxidative cleavage of the C(sp2)–H bond, followed by C3-nucleophilic attack of IBT and oxidation. Interestingly, under these conditions 2-(benzo[d]imidazo[2,1-b]thiazol-2-yl)aniline gave the benzo[4′,5′]thiazolo[2′
一种新的余2为苯并的C3-dicarbonylation [促进,高效金属和无过氧化物更环保的多米诺协议d ]咪唑并[2,1- b与苯乙烯]噻唑(IBTS)已经开发通过的氧化裂解C(sp 2)–H键,随后是IBT的C3亲核攻击和氧化。有趣的是,在这些条件下2-(苯并[ d ]咪唑并[ 2,1- b ]噻唑-2-基)苯胺得到苯并[4',5']噻唑并[2',3':2,3]咪唑[4,5- c ]喹啉衍生物通过C(sp 2的氧化裂解)–H键,然后进行Pictet–Spengler环化和芳构化。该方法除了具有更高的产率外,还具有广泛的底物范围,环保特性和高原子经济性的优点。