Rhodium-Catalyzed Asymmetric [2 + 2 + 2] Cycloaddition of α,ω-Diynes with Unsymmetrical 1,2-Disubstituted Alkenes
作者:Yukimasa Aida、Haruki Sugiyama、Hidehiro Uekusa、Yu Shibata、Ken Tanaka
DOI:10.1021/acs.orglett.6b01116
日期:2016.6.3
bisphosphine complex catalyzes the asymmetric [2 + 2 + 2] cycloaddition of α,ω-diynes with electron-rich and unstrained unsymmetrical 1,2-disubstituted alkenes to give chiral multicyclic compounds with good yields and ee values. Interestingly, enantioselectivity highly depends on the structures of α,ω-diynes used presumably due to the presence of two distinct reaction pathways.
现已确定,阳离子铑(I)/轴向手性联芳基双膦配合物可催化α,ω-二炔与不饱和电子的不对称[2 + 2 + 2]环加成反应,并带有不饱和的不对称1,2-二取代烯烃,从而得到手性具有良好收率和ee值的多环化合物。有趣的是,对映选择性很大程度上取决于所使用的α,ω-二炔结构,这是由于存在两个不同的反应途径。