Novel synthesis of 3-pyrrole substituted ?-lactams via microwave-induced bismuth nitrate-catalyzed reaction
作者:Debasish Bandyopadhyay、Jessica Cruz、Bimal K. Banik
DOI:10.1016/j.tet.2012.06.009
日期:2012.12
Highly stereoselective synthesis of 3-pyrrole substituted β-lactams is accomplished. The first step involves the synthesis of 3-phthalimido substituted β-lactams following Staudinger cycloaddition reaction of acid chloride equivalent with imines. Synthesis of 3-amino β-lactams is achieved via the deprotection of phthalimido group with ethylenediamine. These 3-amino β-lactams are converted to a new
完成了3-吡咯取代的β-内酰胺的高度立体选择性合成。第一步涉及在酰基氯当量与亚胺的斯托丁格环加成反应之后,合成3-邻苯二甲酰亚胺基取代的β-内酰胺。3-氨基β-内酰胺的合成是通过用乙二胺将邻苯二甲酰亚胺基脱保护而实现的。这些3-氨基β-内酰胺在室温下以及使用微波诱导的硝酸铋催化的反应以优异的产率被转化为一系列新的N-取代的吡咯。用N- chrysenyl系统观察到反式吡咯取代的β-内酰胺的排他性形成。该方法对于合成外消旋以及光学纯的3-吡咯取代的β-内酰胺同样有效。