Facile Synthesis of 2,2-Diacyl Spirocyclohexanones via an N-Heterocyclic Carbene-Catalyzed Formal [3C + 3C] Annulation
作者:Yaru Gao、Dehai Liu、Zhenqian Fu、Wei Huang
DOI:10.1021/acs.orglett.8b03892
日期:2019.2.15
A novel strategy for the construction of 2,2-diacyl spirocyclohexanones 3 has been demonstrated on the basis of an NHC-catalyzed [3C + 3C] annulation of potassium 2-oxo-3-enoates with 2-ethylidene 1,3-indandiones. Furthermore, enantioenriched 3 was obtained in good to excellent yields with good enantioselectivities when chiral N-heterocyclic carbene (NHC) was employed. Notably, ring opening of the
为2,2-二酰基spirocyclohexanones建设的新策略3已经证明钾2-氧-3- enoates与2-亚乙基-1,3- indandiones一个NHC催化[3C + 3C]环的基础上。此外,当使用手性N-杂环卡宾(NHC)时,以良好的对映选择性良好地获得优异的对映体富集的3。值得注意的是,所得的2,2-二酰基螺环己酮3与肼的开环导致邻苯二氮酮的形成具有良好至优异的产率。