N-Glyoxyloyl-(2R)-bornane-10,2-sultam (1a) and (1R)-8-phenylmenthyl glyoxylate (1b) react stereoselectively with simple nitroalkanes giving diastereomeric nitroalcohols with high asymmetric induction. The glyoximide 1a is proved to be a highly efficient chiral inducer, superior to glyoxylate 1b. In all cases, the absolute configuration (2S) and relative configuration, syn for the major diastereoisomers
N-
乙醛酰-(2R)-
硼烷-10,2-sultam(1a)和(1 R)-8-苯基薄荷基
乙醛酸酯(1b)与简单的硝基
烷烃立体选择性地反应,得到具有高不对称诱导性的非对映体硝基醇。乙二
酰亚胺1a被证明是一种高效的手性诱导剂,优于
乙醛酸1b。在所有情况下,均确认了主要非对映异构体的绝对构型(2 S)和相对构型,syn。