Efficient synthesis of new imidazo[1,2-b][1,2]benzothiazine 4,4-dioxide derivatives via lateral lithiation of N-mesitylenesulfonyl hydantoins
作者:Yakdhane Kacem、Béchir Ben Hassine
DOI:10.1016/j.tetlet.2012.08.008
日期:2012.10
commercial α-amino acids, undergo lateral lithiation with an excess of lithium diisopropylamide and tetramethylethylenediamine in the presence of trimethylsilyl chloride to provide new imidazo[1,2-b][1,2]benzothiazin-2-one 4,4-dioxide derivatives in yields ranging from 44–65%.
N-均三甲磺酰基乙内酰脲易于购自商业α-氨基酸,在三甲基甲硅烷基氯的存在下,用过量的二异丙基氨基锂和四甲基乙二胺进行侧向锂化反应,以提供新的咪唑并[1,2- b ] [1,2]苯并噻嗪-2 -一种4,4-二氧化物衍生物,产率为44–65%。