Intramolecular sulphonyl-amidomethylation. Part I. Cyclization of benzylsulphonamides
作者:Orfeo O. Orazi、Renée A. Corral、Rodolfo Bravo
DOI:10.1002/jhet.5570230620
日期:1986.11
strong acid media is a synthetically useful route to 3,4-dihydro-1H-2,3-benzothiazine 2,2-dioxides III. With insufficient acid strength or reaction time, kinetic products IV and VI are obtained; the latter compounds can be converted into the thermodynamic products III under stronger conditions. The reactions proceed via imine VII or iminium VIII compounds as common intermediates.
在强酸介质中苄基磺酰胺与醛的环化是合成3,4-二氢-1 H -2,3-苯并噻嗪2,2-二氧化物III的合成途径。在不足的酸强度或反应时间的情况下,获得了动力学产物IV和VI。后者的化合物可以在更强的条件下转化为热力学产物III。反应通过亚胺VII或亚胺VIII化合物作为常见中间体进行。