The stereoselectivity of the title reactions due to a hindering amino group in α-asymmetric aminoketones (1 and 2) and to an asymmetric center far away from the reaction center in β-(methylpiperidino)-ketones (11–14) has been studied. The aminoalcohols obtained (3–8 and 15–22) have been separated in most cases and the relative configurations attributed by NMR. Based on diastereomeric ratios, a N-coordinated
标题反应由于立体选择性阻碍在α-不对称
氨基酮(
氨基1和2)和一个不对称中心远离反应中心在β-(甲基
哌啶) -酮(11 - 14)进行了研究。获得(
氨基醇3 - 8和15 - 22)已经在大多数情况下,用NMR归属的相对构型被分离。基于非对映体比率,已经提出了N配位的环状过渡态,并且至少对于β-
氨基酮体系上的格氏反应是有效的。