Facile Preparation of 3,4-Dihydro-2,1-benzothiazine
2,2-Dioxides and Related Reaction with 1,3-Diiodo-5,5-dimethylhydantoin
under Photochemical Conditions
作者:Hideo Togo、Atsushi Moroda、Shusuke Furuyama
DOI:10.1055/s-0028-1216725
日期:——
3,4-Dihydro-2,1-benzothiazine 2,2-dioxides were easily obtained in good yields by the reaction of N-methyl 2-arylethane-sulfonamides with 1,3-diiodo-5,5-dimethylhydantoin (D1H) under irradiation with a tungsten lamp. When N-benzyl 2-phenylethane-sulfonamide was treated with DIH under the same conditions, the corresponding N-benzyl 3,4-dihydro-2,1-benzothiazine 2,2-dioxide was obtained in good yield
通过 N-甲基 2-芳基乙烷-磺酰胺与 1,3-二碘-5,5-二甲基乙内酰脲 (D1H) 在下反应,3,4-二氢-2,1-苯并噻嗪 2,2-二氧化物很容易以良好的收率获得用钨灯照射。N-苄基2-苯基乙磺酰胺在相同条件下用DIH处理,以良好的收率得到相应的N-苄基3,4-二氢-2,1-苯并噻嗪2,2-二氧化物,N-苄基在 Pd(OH) 2 存在下用氢气处理很容易去除基团。另一方面,在钨灯照射下用 DIH 处理 N-3-芳基丙基三氟甲磺酰胺以良好的产率提供相应的 N-三氟甲磺酰基-1,2,3,4-四氢喹啉。