关键词: 氨基酸, 质谱法, 乙酯, 氨基酸, 酯, 元素分析, 红外分光光度法, 盐酸, 质子磁共振谱法, 苯 P

The reaction of benzenecarboximidate I with aldehydes RCHO (R = H, Et, Pr, Bu, CH2CHMe2) under phase-transfer conditions gave diastereoisomeric pairs of oxazolines II. II are intermediates in the synthesis of b-hydroxy a-amino acids. Thus, cis-II can be cleaved by aqueous HCl to give erythro acids III, whereas the cleavage of trans-II will give threo acids IV.

Key words: AMINO ACID, AMINO ACID, ESTERS, MASS SPECTROGRAPHY, ETHYL ESTER, ELEMENTAL ANALYSIS, PROTON MAGNETIC RESONANCE SPECTROMETRY, INFRARED SPECTROPHOTOMETRY, HYDROCHLORIC ACID, BENZENE P