Distorted amides as models for activated peptide N-C(O) units. 3. Synthesis, hydrolytic profile, and molecular structure of 2,3,4,5-tetrahydro-2-oxo-1,5-propanobenzazepine
作者:Q. P. Wang、A. J. Bennet、Robert Stanley Brown、B. D. Santarsiero
DOI:10.1021/ja00015a033
日期:1991.7
attendent rehybridization of the N from sp 2 to sp 3 and a slight pyramidalization of the (N)(C)C=O unit. Based on the solvent kinetic isotope effects, pH/rate profiles, and activation parameters, a unified mechanism for H 3 O + - and OH − -promoted hydrolysis of these anilides is proposed. The effect of varying [acetate] in catalyzing the hydrolysis of 1b and 1c in H 2 O and D 2 O as a funciton of pL
合成了一种扭曲的酰胺(2,3,4,5-四氢-2-oxo-1,5-propanobenzazepine (1d),并通过 X 射线衍射确定了其结构。将 1d 的酰胺单元与未扭曲的酰胺单元进行比较对溴-N,2-二甲基乙酰苯胺 (3b) 和更多扭曲的 2,3,4,5-四氢-2-oxo-1,5-ethanobenzazepine (1b) 和 3,4-dihydro-2-oxo-1, 4-丙喹啉 (1c). 渐进性扭曲表现为 NC(O) 键的延长、C=O 键的轻微缩短以及 NC(O) 单元的扭曲以及 N 的伴随再杂化sp 2 到 sp 3 和 (N)(C)C=O 单元的轻微金字塔化。基于溶剂动力学同位素效应、pH/速率曲线和活化参数,H 3 O + - 和 OH 的统一机制- - 建议促进这些苯胺的水解。研究和分析了不同 [乙酸盐] 在催化 H 2 O 和 D 2 O 中作为 pL 函数的 1b 和