Iodocyclization of <i>o</i>-Alkynylbenzamides Revisited: Formation of Isobenzofuran-1(3<i>H</i>)-imines and 1<i>H</i>-Isochromen-1-imines Instead of Lactams
作者:Claudine Schlemmer、Lars Andernach、Dieter Schollmeyer、Bernd F. Straub、Till Opatz
DOI:10.1021/jo3017378
日期:2012.11.16
The iodocyclization of o-allcynylbenzamides with various electrophiles has been reported to yield five- or six-membered lactams by nucleophilic attack of the amide nitrogen onto the triple bond. While the formation of an isobenzofuran-1(3H)-imine with two bulky substituents under Larock conditions was initially attributed to steric hindrance, we found out that cyclization via the amide oxygen is the rule rather than the exception. Thus, the structures of the products reported in the literature need to be revised.