A pool of water-compatible catalysts, namely dialkyl-(S)-prolinols, has been developed for the enantioselective direct vinylogous Michael addition reaction of vinylmalononitriles to α,β-unsaturated aldehydes in aqueous medium. In many cases, the products can be obtained in almost optically pure form (>96% ee) after a single recrystallization.
已经开发了
水相容性催化剂的池,即二烷基-(S)-脯
氨醇,用于在
水性介质中
乙烯基丙二腈向α,β-不饱和醛的对映选择性直接
乙烯基类Michael加成反应。在许多情况下,单次重结晶后,几乎可以得到光学上纯净的形式(> 96%ee)的产品。