A one-pot, non-catalytic approach to 1,2,4-benzothiadiazine-1,1-dioxides
作者:Artem Cherepakha、Vladimir O. Kovtunenko、Andrey Tolmachev、Oleg Lukin
DOI:10.1016/j.tet.2011.06.063
日期:2011.8
three factors: (i) the nature of the o-halogen, (ii) the electronic character of the benzene ring substituent, and (iii) the steric load around the amidine unit. O-Fluorobenzenesulfonyl chlorides bearing methylcarboxyl- or nitro-group and o-chloro- and o-bromobenzenesulfonyl chlorides bearing nitro-group are reactive enough to give the desired 1,2,4-benzothiadiazine-1,1-dioxides in a one-pot base-promoted