(R)-(+)-N-Methylbenzoguanidine ((R)-NMBG) catalyzed kinetic resolution of racemic secondary benzylic alcohols with free carboxylic acids by asymmetric esterification
作者:Kenya Nakata、Isamu Shiina
DOI:10.1039/c1ob05736g
日期:——
the kinetic resolution of racemic secondary benzylic alcohols in the presence of achiral carboxylic acids and pivalic anhydride. The use of a tertiary amine in this reaction is not necessary to attain good chemical yields of the products. It was determined that diphenylacetic acid could be employed as the most suitable acyl donor for achieving a high enantioselectivity for the kinetic resolution of
(R)-(+)- N-甲基苯并胍((R)-NMBG)被发现可作为有效的酰基转移催化剂,用于在非手性羧酸和非手性羧酸存在下动力学拆分外消旋仲苄醇。新戊酸酐。为了获得产物的良好化学收率,在该反应中使用叔胺不是必需的。确定二苯乙酸可以用作最合适的酰基供体,以实现对C-1位具有正常脂族烷基链的外消旋仲苄醇的动力学拆分的高对映选择性。另一方面,较少受阻的羧酸,例如3-苯基丙酸,作为在C-1位具有支链脂族烷基链的外消旋仲苄醇的动力学拆分的更好的酰基供体。