A series of propanones containing combinations of aryloxy and alkoxy substituents at the 1- and 3-positions were reduced to the alcohols via asymmetric transfer hydrogenation using a tethered Ru(II)/TsDPEN catalyst. The enantioselectivities of the reductions reveal a complex pattern of electronic and steric effects which, when used in a matched combination, can lead to the formation of products of
使用束缚的Ru(II)/ TsDPEN催化剂,通过不对称转移氢化,将一系列在1-位和3-位含有芳氧基和烷氧基取代基的
丙烷组合还原为醇。还原的对映选择性揭示了电子和空间效应的复杂模式,当以匹配的组合使用时,可导致从这一极富挑战性的底物形成高达68%ee(84:16 er)的产物。