作者:Remir G. Kostyanovsky、Vladimir F. Rudchenko、Oleg A. D'yachenko、Ivan I. Chervin、Aleksandr B. Zolotoi、Lev O. Atovmyan
DOI:10.1016/s0040-4020(01)99484-0
日期:1979.1
R-(+)-phenylethylammonium salts was completely separated into the enantiomeric salts (+10 and −10). Esterification and amidation of these salts afforded antipodes 2 S-( +12) and 2 R-( −12) containing only a nitrogen asymmetric center. Optical purities of the products were established on the basis of their NMR spectra with shift-reagent. Molecular and crystal structure as well as an absolute configuration of +10 were
已经阐明了1-烷氧基异恶唑烷-3,3-二羧酸酯(1)的酰胺化的反式立体特异性。单酯4的碱性水解产生了盐6,其在以S(-)和R -(+)-苯基乙基铵盐的形式进行离子交换后被完全分离成对映体盐(+10和-10)。这些盐的酯化和酰胺化得到仅含有氮不对称中心的对映体2 S -(+12)和2 R -(-12)。产物的光学纯度是基于其具有位移试剂的NMR光谱确定的。通过X射线分析检测到分子和晶体结构以及+10的绝对构型。