Catalytic enantioselective synthesis of chiral spirocyclic 1,3-diketones <i>via</i> organo-cation catalysis
作者:Xiao-Yan Zhang、Ya-Ping Shao、Bao-Kuan Guo、Kun Zhang、Fu-Min Zhang、Xiao-Ming Zhang、Yong-Qiang Tu
DOI:10.1039/d1cc05205e
日期:——
provides convenient access to a range of enantioenriched spirocyclic 1,3-diketones in moderate to high yields and enantioselectivities and features a broad substrate scope in terms of enol lactones. The catalytic capability of this triazolium salt catalyst is also demonstrated in this enantioselective transformation, which could inspire its further application.
An example of asymmetric Steglich-type rearrangement of enol lactones is reported. This highly enantioselective acyl transfer reaction is catalyzed by chiral isothiourea at ambient temperature and provides a useful synthetic approach to access enantioenriched spirotricyclic β,β′-diketones from a broad range of indanone or tetralone-derived lactones. Preliminary mechanistic studies suggest the initial