A Convenient and Asymmetric Protocol for the Synthesis of Natural Products Containing Chiral Alkyl Chains via Zr-Catalyzed Asymmetric Carboalumination of Alkenes. Synthesis of Phytol and Vitamins E and K
摘要:
[GRAPHICS]A convenient and asymmetric protocol for the synthesis of chiral oligoisoprenoids is described. Typically, a C-14 vitamin E side chain 5 was synthesized in 47% yield over four steps. Isomeric purity of 5 was upgraded to > 99% R at C-2 and 97% R at C-6 by the statistical formation of stereoisomeric p-phenylenebisurethanes and their diastereomeric separation. In addition, phytol and vitamin K were synthesized in 21% and 28% overall yields, respectively, over five steps from 1.
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯醛或β-羟基异丁酸中合成维生素E的外消旋或光学活性形式,包括在这种合成过程中的中间体。
Synthesis of vitamin E
申请人:Hoffman-La Roche Inc.
公开号:US04151205A1
公开(公告)日:1979-04-24
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯醛或β-羟基异丁酸中合成光学活性或外消旋形式的维生素E,包括在这个合成中的中间体。
Protected alcohols
申请人:Hoffmann-La Roche Inc.
公开号:US04191842A1
公开(公告)日:1980-03-04
A synthesis of vitamin E in racemic or optically active forms from methacryolein or beta-hydroxyisobutyric acid including intermediates in this synthesis.
从甲基丙烯酰或β-羟基异丁酸中合成光学活性或外消旋形式的维生素E,包括在此合成过程中的中间体。
A novel approach to produce natural vitamin E making use of an asymmetric synthesis
申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP0320777A2
公开(公告)日:1989-06-21
A new approach to produce vitamin E in optically active pure form involving an asymmetric synthesis and novel intermediates therein.
生产纯光学活性维生素 E 的新方法,涉及不对称合成及其新型中间体。
Synthetic studies on (2R,4'R,8'R)-.alpha.-tocopherol. An approach utilizing side chain synthons of microbiological origin
作者:Noal Cohen、Wayne F. Eichel、Rocco J. Lopresti、Christian Neukom、Gabriel Saucy