Intramolecular Aza-Anti-Michael Addition of an Amide Anion to Enones: A Regiospecific Approach to Tetramic Acid Derivatives
作者:Xihe Bi、Jingping Zhang、Qun Liu、Jing Tan、Bing Li
DOI:10.1002/adsc.200600542
日期:2007.10.8
A novel intramolecular aza-anti-Michael addition was disclosed in the one-pot reactions between 3-oxobutanamides and aryl (heteroaryl) aldehydes under basic conditions, in which amide anions regiospecifically attacked the α-carbon of an enone fragment, providing a new route to biologically important tetramic acid derivatives. An explanation for the unexpected regioselectivity is proposed based on the
在碱性条件下,在3-氧代丁酰胺与芳基(杂芳基)醛的一锅反应中公开了一种新颖的分子内氮杂-抗-迈克尔加成反应,其中酰胺阴离子区域特异性地攻击烯酮片段的α-碳,提供了一条新途径生物重要的四酸衍生物。基于实验和理论计算的结果,提出了对意外的区域选择性的解释,这归因于(1)共轭和刚性分子骨架,以及(2)亲核位点和烯酮α-碳的邻近效应。