乙酰乙酰苯胺类化合物导向的2,2-二溴乙酰苯胺衍生物的合成

An Efficient Access to α-Dibromosubstituted Arylamides from β-Keto Arylamides

以N-溴代丁二酰亚胺(NBS)为溴源,醋酸为催化剂和溶剂,经过活泼亚甲基的两次连续的溴化,羰基的质子化和碳碳键的断裂等过程合成了2,2-二溴乙酰苯胺衍生物.该方法具有操作简便、反应条件温和和高效等特点.所有反应都能以极高的收率得到相应的目标产物.

A remarkably simple, mild and efficient approach for carbon-carbon bond cleavage of β-keto amides using N-bromobutanimide（NBS） as the bromine source and acetic acid as the catalyst to construct α-dibromosubstituted arylamides is achieved. Moreover, tandem carbon-bromine bond formation, followed by protonation of carbonyl and cleavage of C—C bond in one pot has also been demonstrated. All the reactions were carried out under extremely mild conditions and provided almost quantitative yields of the products.