Hydroalkylation leading to heterocyclic compounds. Part 1: New strategies for the synthesis of polysubstituted 2H-pyran-2-ones
作者:Wei-Bing Liu、Huan-Feng Jiang、Chun-Li Qiao
DOI:10.1016/j.tet.2008.12.069
日期:2009.3
Polysubstituted 2H-pyran-2-ones and 5,6-dihydro-2H-pyran-2-ones were synthesized via the MCRs initiated by the hydroalkylation of alkynoates with activated methylenes. Under the optimized reaction conditions, the desired products were obtained in 47–88% isolated yields. The experimental results showed that the groups on activated methylenes act important roles in the nucleophilic attack fashion.
经由MCR合成多取代的2 H-吡喃-2-酮和5,6-二氢-2 H-吡喃-2-酮,所述MCR是通过炔烃与活化的亚甲基的加氢烷基化反应而引发的。在优化的反应条件下,所需产物的分离产率为47-88%。实验结果表明,活化亚甲基上的基团以亲核攻击方式起着重要作用。