Catalytic Enantioselective Conjugate Addition of Carbamates
摘要:
Catalytic, asymmetric conjugate addition of carbamates to enoyl systems has been realized for the first time, providing a two-step access to virtually enantiopure N-protected beta-amino acids.
Catalytic Enantioselective Conjugate Addition of Carbamates
作者:Claudio Palomo、Mikel Oiarbide、Rajkumar Halder、Michael Kelso、Enrique Gómez-Bengoa、Jesús M. García
DOI:10.1021/ja047004e
日期:2004.8.1
Catalytic, asymmetric conjugate addition of carbamates to enoyl systems has been realized for the first time, providing a two-step access to virtually enantiopure N-protected beta-amino acids.
Palladium-Catalyzed Oxidative Cyclizations: Synthesis of Dihydropyranones and Furanones
good yields. The Pd(II)-mediated oxidative cyclization was expanded to α-hydroxyenones leading to furan-3(2H)-one derivatives, which include natural product bullatenone and a known precursor of geiparvarin. The sole product of the oxidative cyclization of α,β-dihydroxyenone was a five-membered furan-3(2H)-one derivative, suggesting that the ring closure of these diols is both chemo- and regioselective