Highly site, regio-, and stereoselective multicomponent reaction of benzimidazole carbenes, isothiocyanates, and allenoates
作者:Bo Wang、Jia-Qi Li、Ying Cheng
DOI:10.1016/j.tetlet.2007.11.095
日期:2008.1
allenoates proceeded efficiently in a highly site, regio-, and stereoselective manner to produce predominantly spiro[benzimidazoline-2,3′-tetrahydrothiophene] derivatives. The reaction was proposed to occur via a tandem nucleophilic addition of carbenes to isothiocyanates followed by an unusual [3+2] cycloaddition to the less activated carbon–carbon double bond of allenoates.