Selectivity in Garratt−Braverman Cyclization: An Experimental and Computational Study
作者:Manasi Maji、Dibyendu Mallick、Sayantan Mondal、Anakuthil Anoop、Subhendu Sekhar Bag、Amit Basak、Eluvathingal D. Jemmis
DOI:10.1021/ol102861j
日期:2011.3.4
Bispropargylsulfones equipped with aromatic rings of dissimilar nature were synthesized. Underbasicconditions, these sulfones isomerized to the bisallenic sulfones, creating a competitive scenario between two alternate Garratt−Braverman (GB) cyclizationpathways. The observed product distribution ruled out the involvement of any ionic intermediate and supported the diradical mechanism with greater