A Stereoselective Cyclization Strategy for the Preparation of γ-Lactams and Their Use in the Synthesis of α-Methyl-β-Proline
作者:Souvik Banerjee、Justin Smith、Jillian Smith、Caleb Faulkner、Douglas S. Masterson
DOI:10.1021/jo3015903
日期:2012.12.7
A straightforward stereoselective and enantiodivergent cyclization strategy for the construction of γ-lactams is described. The cyclization strategy makes use of chiral malonic esters prepared from enantiomerically enriched monoesters of disubstituted malonic acid. The cyclization occurs with the selective displacement of a substituted benzyl alcohol as the leaving group. A Hammett study illustrates
描述了构建γ-内酰胺的直接立体选择性和对映异构环化策略。环化策略利用由对映异构体富集的二取代丙二酸单酯制备的手性丙二酸酯。通过选择性取代取代的苯甲醇作为离去基团来发生环化。Hammett的研究表明环化是在电子控制下进行的。所得的γ-内酰胺可以容易地转化为新的脯氨酸类似物。