It has been established that a cationic rhodium(I)/(R)-BINAP complex catalyzes the asymmetric [2 + 2 + 2] cycloaddition of unsymmetrical α,ω-diynes with acenaphthylene at room temperature to give the corresponding chiral multicyclic compounds with high yields and ee values. Interestingly, enantioselectivity highly depended on the structures of α,ω-diynes used. The structural requirements of α,ω-diynes
现已确定,阳离子
铑(I)/(R)-BINAP配合物在室温下催化不对称的α,ω-二炔与a烯的不对称[2 + 2 + 2]环加成反应,得到相应的手性
多环化合物产量和ee值。有趣的是,对映选择性高度取决于所用的α,ω-二炔结构。高对映体选择性的α,ω-二炔的结构要求与我们先前报道的阳离子
铑(I)/(R)-Difluorphos络合物催化的α,ω-二炔的不对称[2 + 2 + 2]环加成反应相反。
茚。