Selective esterifications of alcohols and phenols through carbodiimide couplingsElectronic supplementary information (ESI) available: the characterization of new compounds and literature references for known compounds. See http://www.rsc.org/suppdata/ob/b3/b312559a/
作者:Rimma Shelkov、Moshe Nahmany、Artem Melman
DOI:10.1039/b312559a
日期:——
Esterification of carboxylic acids capable of forming ketene intermediates upon treatment with carbodiimides permits the selective acylation of alcohols in the presence of phenols lacking strong electron-withdrawing groups. The selectivity of acylations involving highly acidic phenols could be reversed through the addition of catalytic amount of acid. Esterification of other carboxylic acids was found
在用碳二亚胺处理后能够形成烯酮中间体的羧酸的酯化反应可在缺乏强吸电子基团的酚存在下对醇进行选择性酰化。可以通过添加催化量的酸来逆转涉及高酸性酚的酰化反应的选择性。发现其他羧酸的酯化反应通过对称酸酐的形成进行,并提供相反的化学选择性。在这两种情况下,取代酚的相对酰化速率均与反应机理一致,该机理涉及酚盐阴离子攻击亲电子中间体(例如乙烯酮和对称酸酐),而碳二亚胺既用作活化剂,又用作碱性催化剂。