syntheses of a library of novel dihydrothiophenone-engrafted dispiro oxindole/indenoquinoxaline-pyrrolidine/pyrrolothiazole/indolizine hybrid heterocycles have been realized through a chemo-, regio-, and stereoselective multicomponent 1,3-dipolarcycloaddition strategy.
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。
Synthesis of highly functionalized 2-thiaspiro[4.5]deca-6,8-dienes via atom efficient tandem Michael addition/Thorpe–Ziegler cyclization
two-component reaction of 2,4-bis((Z)-arylidene)dihydrothiophen-3(2H)-ones and 2-(1-arylethylidene)malononitriles proceeded through tandem chemoselective Michael addition-tautomerization-Thorpe-Ziegler cyclization sequence of reactions in a single step affording novel 2-thiaspiro[4.5]deca-6,8-dienes in quantitative yields.