Enantioselective synthesis of Bakuchiol using diazosulfonate C–H insertion to install the quaternary center
作者:Joseph P. Bequette、Christian S. Jungong、Alexei V. Novikov
DOI:10.1016/j.tetlet.2009.09.147
日期:2009.12
Bakuchiol was prepared from commercial (-)-citronellol using the diazosulfonate C-H insertion to control the regioselectivity and install the quaternary center. (C) 2009 Elsevier Ltd. All rights reserved.
Asymmetric Construction of All-Carbon Quaternary Stereocenters by Chiral-Auxiliary-Mediated Claisen Rearrangement and Total Synthesis of (+)-Bakuchiol
An asymmetricClaisenrearrangement using Oppolzer’s camphorsultam was developed. Under thermal conditions, a geraniol-derived substrate underwent the rearrangement with good stereoselectivity. The absolute configuration of the newly formed all-carbonquaternary stereocenter was confirmed by the total synthesis of (+)-bakuchiol from the rearrangement product.