Enantioselective synthesis of 3,4-dihydropyran derivatives via a Michael addition reaction catalysed by chiral pybox–diph–Zn(ii) complex
作者:Sumit K. Ray、Subhrajit Rout、Vinod K. Singh
DOI:10.1039/c3ob40246k
日期:——
An enantioselective Michael addition of cyclic 1,3-dicarbonyls to 2-enoylpyridine N-oxides catalyzed by a chiral pyboxâdiphâZn(II) complex has been developed. The corresponding Michael adducts have been obtained in high yields with up to >99% ee. The Michael adduct has been transformed to biologically active 2,4-disubstituted hexahydroquinoline. A plausible transition-state model has been proposed to explain the stereochemical outcome of the reaction.
在手性吡蚜二锌(II)配合物的催化下,开发出了环状 1,3-二羰基与 2-烯酰吡啶 N-氧化物的对映选择性迈克尔加成反应。相应的迈克尔加合物产量很高,ee高达99%以上。迈克尔加合物已转化为具有生物活性的 2,4-二取代六氢喹啉。提出了一个合理的过渡态模型来解释反应的立体化学结果。