Synthesis of novel dihydronaphthothiazine S,S -dioxides by intramolecular sulfonylamidomethylation of 2-naphthylmethanesulfonamides using Amberlyst XN-1010
作者:Leandro D. Sasiambarrena、Alicia S. Cánepa、Rodolfo D. Bravo
DOI:10.1016/j.tetlet.2015.11.042
日期:2015.12
We describe herein an efficient synthetic method for novel dihydronaphthothiazines S,S-dioxides by aromatic intramolecular sulfonylamidomethylation of 2-naphthylmethanesulfonamides with s-trioxane using Amberlyst XN-1010 as acid heterogeneous catalyst. Cyclization of the formed sulfonyliminium ion occurred with high regioselectivity and in excellent yields. (C) 2015 Elsevier Ltd. All rights reserved.