A study on the substituent effects of norbornadiene derivatives in iridium-catalyzed asymmetric [2 + 2] cycloaddition reactions
作者:Jun Hu、Qingjing Yang、Lu Yu、Jianbin Xu、Shanshan Liu、Chao Huang、Lin Wang、Yongyun Zhou、Baomin Fan
DOI:10.1039/c3ob27382b
日期:——
Employing a series of norbornadiene derivatives as substrates, the effects of various substituents on the Ir-catalyzed asymmetric [2 + 2] cycloaddition reactions with arylacetylenes were studied. It was found that the atom forming the short bridge chain had a great effect on the enantioselectivity of the reaction. Heteroatoms, such as oxygen and nitrogen, always resulted in excellent enantioselectivity