Synthesis of 3-Amino-1,2,4-benzothiadi- azine 1,1-Dioxides via a Tandem Aza-Wittig/Heterocumulene Annulation
作者:Christopher Blackburn、Abe Achab、Amy Elder、Shomir Ghosh、Jianping Guo、Geraldine Harriman、Matthew Jones
DOI:10.1021/jo051843h
日期:2005.11.1
polymer-supported triphenylphosphine affords the corresponding iminophosphoranes. Subsequent reaction with isocyanates gives 3-amino-1,2,4-benzothiadiazine 1,1-dioxides in high yields and purities. The reaction has been successfully applied to the synthesis of derivatives with various substituents at the 2- and 3-positions and in the benzenoid ring.