Selectively esterified: Primary alcohols react with dioxygen as a benign oxidant in a palladium‐catalyzed oxidativeesterification (see scheme). The corresponding aldehydes and esters are formed highly selectively depending on the catalyst system. The reactions take place in the presence of commercially available ligands without the need for additional organic hydrogen acceptors.
Cesium Carbonate Catalyzed Esterification of <i>N</i>-Benzyl-<i>N</i>-Boc-amides under Ambient Conditions
作者:Danfeng Ye、Zhiyuan Liu、Hao Chen、Jonathan L. Sessler、Chuanhu Lei
DOI:10.1021/acs.orglett.9b02513
日期:2019.9.6
We report a general activated amide to ester transformation catalyzed by Cs2CO3. Using this approach, esterification proceeds under relatively mild conditions and without the need for a transition metal catalyst. This method exhibits broad substrate scope and represents a practical alternative to existing esterification strategies. The synthetic utility of this protocol is demonstrated via the facile synthesis of crown ether derivatives and the late-stage modification of a representative natural product and several sugars in reasonable yields.