Preparation of Carbamates, Esters, Amides, and Unsymmetrical Ureas via Brønsted Acid-Activated <i>N</i>-Acyl Imidazoliums
作者:Rebecca B. Watson、Todd W. Butler、Jacob C. DeForest
DOI:10.1021/acs.oprd.0c00445
日期:2021.3.19
acid–activated N-acyl imidazoliums as versatile intermediates in carbonyl transformations. The efficient and scalable procedure was validated on a diverse set of carbamates, esters, amides, and unsymmetrical ureas (21 examples, up to 91% yield). Additionally, we exemplify this method on multikilogram scale for the synthesis of an electron-deficient carbamate.
我们报道了布朗斯台德酸活化的N-酰基咪唑在羰基转化中作为通用中间体的应用。在各种氨基甲酸酯,酯,酰胺和不对称脲上验证了有效且可扩展的程序(21个实例,产率高达91%)。此外,我们以多千克规模为例来说明这种方法,用于合成电子缺陷型氨基甲酸酯。