To further improve the enantioselectivity, a variety of more readily available chiral monoenes 5 were also examined (Figure 1). In comparison to chiral diene 3c , chiral monoene 5a gave a little higher conversion. The substituents at the 3,3’-position of binaphthyl framework (5b -e ) were found to influence the enantioselectivity obviously, but could not afford better results. When chiral monoene 5f bearing two different substituents at the 3,3’-position of the chiral framework was utilized, the desired product 4a was obtained in 91% conversion with 65% ee. The chiral framework had an impact on both reactivity and enantioselectivity. H8-BINOL-derived chiral monoene5g gave a similar result with 5a . While 1,1’-spirobiindane chiral framework (5h ) yielded a slightly higher ee with a little drop of conversion.