Organocatalytic Decarboxylative Borylation of Cyclopropane <i>N</i>-Hydroxyphthalimide Esters
作者:Yevhen Krokhmaliuk、Ihor Kleban、Yuliya V. Rassukana、Oleksandr O. Grygorenko
DOI:10.1021/acs.joc.3c02247
日期:2024.2.16
A convenient protocol for the two-step organocatalytic decarboxylative borylation of 1,1-disubstituted, 1,2-disubstituted, and bicyclic cyclopropane carboxylic acids via the corresponding N-hydroxyphthalimide esters is described, using tert-butyl or ethyl isonicotinate as an inexpensive and readily available catalyst. The scope of the method was demonstrated, being limited mainly by electron-poor substrates
描述了通过相应的N-羟基邻苯二甲酰亚胺酯对 1,1-二取代、1,2-二取代和双环环丙烷羧酸进行两步有机催化脱羧硼基化的简便方案,使用异烟酸叔丁酯或异烟酸乙酯作为廉价且容易获得的催化剂。该方法的范围得到了证明,主要受到贫电子基板的限制。反应序列显示出良好的可扩展性(高达 51.5 g)和出色的反式非对映选择性(对于 1,2-二取代底物的情况)。因此,所提出的方法是其他现有(即金属催化)硼脱羧方法的非常有前途的替代方法。