Tandem Oxidation of Allylic and Benzylic Alcohols to Esters Catalyzed by N-Heterocyclic Carbenes
作者:Brooks E. Maki、Audrey Chan、Eric M. Phillips、Karl A. Scheidt
DOI:10.1021/ol062940f
日期:2007.1.1
N-heterocyclic carbenes catalyze the oxidation of allylic, propargylic, and benzylic alcohols to esters with manganese(IV) oxide in excellent yields. A variety of ester derivatives can be synthesized, including protected carboxylates. This one-pot tandem oxidation represents the first organocatalytic oxidation of alcohols to esters. Saturated esters can also be accessed from aldehydes using this method
N-杂环卡宾以极高的收率催化氧化烯丙基,炔丙基和苄基醇,使其与氧化锰(IV)形成酯。可以合成多种酯衍生物,包括被保护的羧酸盐。这种一锅式串联氧化代表了醇到酯的第一次有机催化氧化。也可以使用这种方法从醛中获得饱和酯。通过利用手性催化剂,酰基-杂偶氮中间体成为手性酰化剂,其可以使内消旋1,2-二醇脱对称。[反应:请参见文字]。