Catalytic substitution/cyclization sequences of <i>O</i>-substituted Isocyanates: synthesis of 1-alkoxybenzimidazolones and 1-alkoxy-3,4-dihydroquinazolin-2(1<i>H</i>)-ones
作者:Qiang Wang、Jing An、Howard Alper、Wen-Jing Xiao、André M. Beauchemin
DOI:10.1039/c7cc07926e
日期:——
used in organic synthesis, given their tendency to undergo side reactions (e.g., trimerization). Herein, we show that masked (blocked) O-isocyanate precursors allow one-pot or cascade reaction sequences featuring base-catalyzed substitution with 2-iodoanilines and 2-iodobenzylamines followed by copper-catalyzed cyclization, to form benzimidazolones and 3,4-dihydroquinazolin-2(1H)-ones. This work shows