A microwave-assisted chemoselective synthesis of novel pyrazolo[3,4-b]thieno[3,4-e]pyridines has been achieved via tandem Michael addition–cyclization–tautomerization–oxidative aromatization sequence of reactions. Compounds with ortho-substituted phenyl rings exhibited axial chirality due to restricted rotation around C–C single bond.
通过串联迈克尔加成-环化-互变异构-氧化芳构化反应序列,实现了新型吡唑并[3,4- b ]噻吩并[3,4- e ]吡啶的微波辅助化学选择性合成。带有邻位取代苯环的化合物由于绕C–C单键的旋转受到限制而显示出轴向手性。