作者:Jamilah N. Hankins、Michele Gouws、Amir Mahajer、Ethan S. Kim、Kevin P. Gwaltney、John Haseltine
DOI:10.1016/j.tetlet.2012.03.017
日期:2012.5
fifteen amidoesters derived from β-aminoalcohols were solvolyzed at the ester group in mildly basic methanol-d4. All trials showed pseudo-first-order kinetics by 1H NMR. The rate constants are about 2 to 140-fold larger than those found with simple alkyl esters. The least bulky N-acyl groups generally sponsor the largest rate constants, and strongly so in two cases, but apparently not as a result of
为了更好地了解此类系统的反应性,将15种衍生自β-氨基醇的酰胺基酯在弱碱性甲醇d 4中的酯基处溶剂化。所有试验均通过1 H NMR显示出伪一级动力学。速率常数比简单烷基酯的速率常数大约2至140倍。最小体积的N-酰基基团通常提供最大的速率常数,在两种情况下强烈如此,但是显然不是由于酰胺基团和酯基团之间的空间拥挤程度较小所致。对于那些在酰胺键上倾向于抗构象的酰胺基酯,速率常数也更大。