作者:Konstantin G. Nazarenko、Nataliya A. Shtil、Alexander N. Chernega、Miron O. Lozinskii、Andrey A. Tolmachev
DOI:10.1055/s-2004-822375
日期:——
A new approach for the synthesis of 2-hetaryl derivatives of 3-oxo-3,4-dihydro-2H-1,4-benzothiazines is described. 2-Chloro derivatives of 2a,b were reacted with electron-rich heterocycles 3-14 under basic catalysis (with a slight excess of Et3N) to provide the substitution products 16-36. In the reaction of 2b with 14 and 15, an intermolecular cyclization took place between the amino and ethoxycarbonyl groups, resulting in spiro compounds 35 and 36, respectively.
描述了一种合成3-氧-3,4-二氢-2H-1,4-苯并噻嗪的2-杂芳衍生物的新方法。2-氯衍生物2a和2b在碱性催化(略微过量的三乙胺)下与富电子的杂环化合物3-14反应,得到取代产物16-36。在2b与14和15的反应中,氨基和乙氧基羧基之间发生了分子间环化,分别生成了螺旋化合物35和36。