Minor Enantiomer Recycling: Application to Enantioselective Syntheses of Beta Blockers
作者:Ye-Qian Wen、Robin Hertzberg、Inanllely Gonzalez、Christina Moberg
DOI:10.1002/chem.201303890
日期:2014.3.24
Continuous recycling of the minor product enantiomer obtained from the acetylcyanation of prochiral aldehydes provided access to highly enantiomerically enriched products. Cyanohydrin derivatives, which under normal conditions are obtained with modest or poor enantiomeric ratios, were formed with high enantiomeric purity by using a reinforcing combination of a chiral Lewis acid catalyst and a biocatalyst
从手性醛的乙酰氰化获得的次要产物对映异构体的连续再循环提供了高度对映异构体富集的产物的获得。通过使用手性路易斯酸催化剂和生物催化剂的增强组合,以高对映体纯度形成在正常条件下以适中或较差的对映体比例获得的氰醇衍生物。通过两步程序,将最初获得的产物转化为β-肾上腺素能拮抗剂(S)-丙醇,(R)-二氯异丙基肾上腺素和(R)-nethalalol。