Palladium-Catalyzed Asymmetric Decarboxylative Lactamization of γ-Methylidene-δ-valerolactones with Isocyanates: Conversion of Racemic Lactones to Enantioenriched Lactams
作者:Ryo Shintani、Soyoung Park、Fumitaka Shirozu、Masataka Murakami、Tamio Hayashi
DOI:10.1021/ja807662b
日期:2008.12.3
A palladium-catalyzed asymmetric decarboxylative reaction of racemic gamma-methylidene-delta-valerolactones with aryl isocyanates has been developed to give enantioenriched 3,3-disubstituted 2-piperidones. High enantioselectivity has been achieved by tuning the ester group on substrate and the substituents of phosphoramidite ligand.
钯催化的外消旋 γ-亚甲基-δ-戊内酯与芳基异氰酸酯的不对称脱羧反应得到了对映体富集的 3,3-二取代 2-哌啶酮。通过调整底物上的酯基和亚磷酰胺配体的取代基,实现了高对映选择性。