Staudinger and retro-Staudinger reactions. The dichloro-β-lactam moiety as a useful handle for the synthesis of 4-aryl-2H-1,3-benzothiazine 1,1-dioxides
作者:Lajos Fodor、Péter Csomós、Antal Csámpai、Pál Sohár
DOI:10.1016/j.tetlet.2010.04.051
日期:2010.6
obtained via Staudinger reaction of 4-aryl-2H-1,3-benzothiazines, proved to be a useful protecting strategy for the synthesis of 4-aryl-2H-1,3-benzothiazine 1,1-dioxides. After oxidation of the 1,1-dichloroazeto[2,1-c][1,3]-benzothiazin-2-ones, the thiazine ring could be recovered selectively and in good yield by treatment with base. Thus, novel 4-aryl-2H-1,3-benzothiazine 1,1-dioxides were obtained
通过4-芳基-2 H -1,3-苯并噻嗪的斯托丁格反应获得的二氯-β-内酰胺环被证明是合成4-芳基-2 H -1,3-苯并噻嗪1的有用保护策略。,1-二氧化物。将1,1-二氯氮杂并[2,1- c ] [1,3]-苯并噻嗪-2-酮氧化后,可通过碱处理选择性地回收噻嗪环,并以良好的收率回收。因此,有效地获得了新型的4-芳基-2 H -1,3-苯并噻嗪1,1-二氧化物。