The β-elimination reaction of methyl 3-chloroalaninate has been investigated in the absence and presence of pyridoxal methochloride (2) or pyridoxal (3). Apparently, compound 2 was about twice as effective as 3 in the catalytic reaction that proceeds via a Schiff base of substrate and 2 or 3. The pH-rate profiles for the catalytic reaction with 2 and 3 were analyzed in terms of ionization of the various
3-氯丙酸甲酯的 β-消除反应已在甲
氯吡哆醛 (2) 或
吡哆醛 (3) 存在和不存在的情况下进行了研究。显然,在通过底物和 2 或 3 的席夫碱进行的催化反应中,化合物 2 的效果大约是 3 的两倍。 根据各种离子的电离分析了与 2 和 3 的催化反应的 pH 速率曲线溶液中存在席夫碱物质。发现席夫碱的反应性随着分子电离的进行而降低。讨论了反应机理及其与
磷酸吡哆醛依赖性酶催化的相关性。