Arenesulfonylation of dl-serine, l-proline, l-threonine, and dl-methionine in systems 1,4-dioxane—water and propan-2-ol—water
作者:N. V. Kalinina、T. P. Kustova、L. B. Kochetova
DOI:10.1007/s11172-010-0186-0
日期:2010.5
3-nitrobenzenesulfonyl chloride in water (40%)—1,4-dioxane and water (40%)—isopropanol mixed solvents was studied spectrophotometrically at 298 K. The main reactive form of α-amino acids is shown to be anionic. Under conditions of arenesulfonylation, the basicity of α-amino acids is crucial in determining the reaction rate. Arenesulfonylation rate constants are 20—50 times lower than the constants of N-acylation of
dl-丝氨酸、l-脯氨酸、l-苏氨酸和 dl-蛋氨酸与 3-硝基苯磺酰氯在水 (40%)-1,4-二恶烷和水 (40%)-异丙醇混合溶剂中的相互作用动力学研究在 298 K。 α-氨基酸的主要反应形式显示为阴离子。在芳烃磺酰化条件下,α-氨基酸的碱性对于决定反应速率至关重要。芳烃磺酰化速率常数比相同 α-氨基酸与苯甲酰氯的 N-酰化常数低 20-50 倍,比它们与苯甲酸 4-硝基苯酯反应的速率常数高 104-105 倍。