Reactions of 2-(trimethylsilyloxy)furan 1 and aldehydes catalyzed by a chiral cationic Cr(salen) complex proceeded with remarkably improved enantioselectivity, when a secondary alcohol was added. The role of the alcohol is acceleration of the conversion of an intermediary 1-aldehyde adduct into the final product.
当添加仲醇时,2-(三甲基
硅氧基)
呋喃1和醛在手性阳离子Cr(salen)配合物的催化下进行反应,对映选择性显着提高。醇的作用是加速中间 1-醛加合物转化为最终产品。