Regio- and Enantioselective Rhodium-Catalyzed Allylic Alkylation of Racemic Allylic Alcohols with 1,3-Diketones
作者:Sheng-Biao Tang、Xiao Zhang、Hang-Fei Tu、Shu-Li You
DOI:10.1021/jacs.8b05126
日期:2018.6.20
Highly regio- and enantioselective rhodium-catalyzed allylicalkylation of 1,3-diketones with racemic secondary allylic alcohols is reported. In the presence of a Rh-catalyst derived from the Carreira (P, olefin)-ligand and TFA as an additive, chiral branched α-allylated 1,3-diketones could be obtained in good to excellent yields, with excellent regio- and enantioselectivity ( b/ l > 19/1, 86-98% ee)
Asymmetric and diastereodivergent approach to key intermediates for the synthesis of homopumiliotoxin 223G and epiquinamide isomer
作者:Le Anh Tuan、Hyeyoung Pyeon、Guncheol Kim
DOI:10.1016/j.tetlet.2009.10.098
日期:2010.1
A stereoselective reaction followed by a sequential cyclization route has been used in the divergent synthesis of 1-hydroxyquinolizidione isomers. Sharpless asymmetric dihydroxylation afforded hydroxyl lactone and the following mesylation provided the required precursor for cyclization. (C) 2009 Elsevier Ltd. All rights reserved.