Competitive Reaction Pathways in the Nucleophilic Substitution Reactions of Aryl Benzenesulfonates with Benzylamines in Acetonitrile
作者:Jin Heui Choi、Byung Choon Lee、Hai Whang Lee、Ikchoon Lee
DOI:10.1021/jo0161835
日期:2002.2.1
The reactions of aryl benzenesulfonates (YC6H4SO2OC6H4Z) with benzylamines (XC6H4CH2NH2) in acetonitrile at 65.0 degrees C have been studied. The reactions proceed competitively by S-O (kS-O) and C-O (kC-O) bond scission, but the former provides the major reaction pathway. On the basis of analyses of the Hammett and Brönsted coefficients together with the cross-interaction constants rho(XY), rho(YZ)
catalyzed N-alkylation of benzamides and sulfonamides with alcohols via borrowing hydrogen catalysis is illustrated. Various primary alcohols, including benzyl, heteroaryl, and aliphatic alcohols, were alkylated in good to excellent yields. To shed light on the mechanistic details, several control studies and deuterium labeling experiments were performed. Mechanisticstudies underpin that the reaction is going
说明了通过借氢催化有效的钌掺杂水滑石催化苯甲酰胺和磺酰胺与醇的 N-烷基化。各种伯醇,包括苄基醇、杂芳基醇和脂肪醇,都以良好的收率进行了烷基化。为了阐明机械细节,进行了几项对照研究和氘标记实验。机理研究表明,该反应是通过借氢途径而不是 S N 1 型机理进行的。该反应可以很容易地扩大规模,而不会对产率产生任何不利影响。该催化剂还能够直接由2-氨基苯甲酰胺和醇合成喹唑啉酮。成功的可回收性和高反应性突出了催化剂的实际适用性。