A new procedure for the synthesis of 4-substituted-2H-1,2,3-benzothiadiazine 1,1-dioxides via directed ortho-lithiation of N1-arylsulfonylhydrazonates
作者:Yakdhane Kacem、Béchir Ben Hassine
DOI:10.1016/j.tetlet.2013.05.082
日期:2013.7
N1-Arylsulfonylhydrazonates, which are readily available from commercial N1-arylsulfonylhydrazides, undergo directed ortho-lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine to provide new 2H-1,2,3-benzothiadiazine 1,1-dioxide derivatives in yields ranging from 43% to 85%.
N 1-芳基磺酰肼盐,可容易地从商业上的N 1-芳基磺酰基酰肼获得,将其与过量的二异丙基氨基锂和四甲基乙二胺进行定向邻位锂化,以提供新的2 H -1,2,3-苯并噻二嗪1,1-二氧化物衍生物范围从43%到85%。