A tertiary amine catalyzed carbocyclization sequence to furnish spirocyclo hexene systems having vicinal quaternary stereocenters
作者:Jindian Duan、Fangyi Cao、Xiaoqin Wang、Cheng Ma
DOI:10.1039/c2cc37297e
日期:——
of enolates can be formed stepwise from enolisable 1,3-dicarbonyl-substituted propene systems in the presence of catalytic amounts of 1,4-diazabicyclo[2.2.2]octane (DABCO) to accomplish a highly selective carbocyclization with beta,gamma-unsaturated alpha-keto esters, giving functionalized spiroketones with vicinal quaternary stereocenters.
可以在催化量的1,4-二氮杂双环[2.2.2]辛烷(DABCO)存在下,由可烯丙基的1,3-二羰基取代的丙烯系统逐步形成两种类型的烯醇化物,从而实现具有β,γ的高选择性碳环化反应-不饱和的α-酮酸酯,可得到具有邻近四元立体中心的功能化螺酮。