Preparation and Some Reactions of 1H-1,4-Benzothiazine Ylides (= 1H-1,4-Benzothioniaazin-4-ide)
作者:George M. Iskander、Ibrahim E. Khawad、Ghariballa Yousif、Keith Fisher、C. Kay Fair、Elmer O. Schlemper
DOI:10.1002/hlca.19850680816
日期:1985.12.18
1H-1,4-benzothiazine ylides were obtained by alkylation of the corresponding 4H-1,4-benzothiazines 1. Ylides of type 2g–r showed slight [1,2] rearrangements upon thermolysis besides main dealkylation to 1 and olefin production. The ylides of this type underwent redox reactions when treated with hydrazine hydrate alone, giving 3,4-dihydro-2H-1,4-benzothiazines mainly, while ylides of type 2a–f failed
通过将相应的4 H -1,4-苯并噻嗪1 1烷基化,获得了一系列的十五个1 H -1,4-苯并噻嗪酰基化物。2g–r类型的叶立德在热解后显示出轻微的[1,2]重排,除了主要脱烷基为1和产生烯烃。当单独用水合肼处理时,该类型的酰基化物会发生氧化还原反应,主要生成3,4-二氢-2 H -1,4-苯并噻嗪,而2a–f类型的酰基化物则无法反应。