First stereocontrolled acetylation of a hydroxypropargylpiperidone by lipase CALB
作者:Gliseida Z. Melgar、Edison P. Wendler、Alcindo A. dos Santos、André L.M. Porto
DOI:10.1016/j.tetasy.2010.07.024
日期:2010.9
kinetic resolution process using the lipase from Candida antarctica. Lipase CALB has been shown to efficiently catalyse the stereocontrolled acetylation of hydroxypropargylpiperidones rac-3 by promoting stereodiscrimination at the carbinolic centre. The enzymatic catalytic processes allow the separation of the (S,R)- and (S,S)-3 diastereoisomers into the corresponding acetates produced as a (R,S)- and
Hydroxypropargylpiperidones外消旋- 1 - 3分别有效地一锅三组分偶合反应而获得; 然后使用南极假丝酵母的脂肪酶通过动力学拆分过程获得了对映体富集的炔丙基哌啶酮。脂肪酶CALB已被证明可通过促进在碳氢化合物中心的立体区分而有效催化羟基炔丙基哌啶酮rac - 3的立体控制乙酰化。酶催化过程允许(S,R)-和(S,S)-3的分离非对映异构体变成相应的乙酸酯,以(R,S)-和(R,R)-6非对映异构体对的形式产生。根据Kaslauzkas规则,CALB能够区分rac - 3的第二个(R)-对映异构体的立体中心。脂肪酶不能区分偏远的立体成因中心。获得的功能化的对映体富集的非对映异构体是有机合成中的重要组成部分。