Palladium-catalyzed asymmetric decarboxylative lactamization of gamma-methylidene-delta-valerolactones with isocyanates: conversion of racemic lactones to enantioenriched lactams.
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.
Shintani
Ryo
R
Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan. shintani@kuchem.kyoto-u.ac.jp
Park
Soyoung
S
Shirozu
Fumitaka
F
Murakami
Masataka
M
Hayashi
Tamio
T