Synthesis of Indazolones via Friedel–Crafts Cyclization of Blocked (Masked) <i>N</i>-Isocyanates
作者:Eslam B. Elkaeed、Jing An、André M. Beauchemin
DOI:10.1021/acs.joc.7b01607
日期:2017.9.15
are rare amphoteric reagents with high, but underdeveloped synthetic potential. Herein, we study the formation of indazolones by Friedel–Crafts cyclization of N-isocyanates usingblocked (masked) N-isocyanate precursors: the effect of the masking group and the reaction scope have been delineated. Substrate synthesis has also been improved using a reported copper-catalyzed coupling of arylbismuth(V) reagents