chiral amino alcohols 3a-e has been prepared from natural amino acid L-cysteine. These compounds have been used as chiral ligands for borane reduction of ketones and for diethylzinc addition to aldehydes. In the reduction of ketones, 3b-e have been used as the substitute of (R)-prolinol to provide (S)-alcohols in good yields and modest enantioselectivity (30–50% ee). In the diethylzinc addition to aldehydes
从天然
氨基酸L-半胱氨酸制备了一系列新的手性
氨基醇3a-e。这些化合物已用作手性
配体,用于酮的
硼烷还原和除醛以外的
二乙基锌。在还原酮中,3b-e已被用作(R)-脯
氨醇的替代品,以高收率和适度的对映选择性(30–50%ee)提供(S)醇。除醛中的
二乙基锌外,3b-e以优异的产率和中等至良好的对映选择性(60-80%ee)促进了(S)醇的形成。