Process for the preparation of 1-(4-fluorophenyl)-4(S)-(4-hydroxyphenyl)-azetidin-2-one
申请人:——
公开号:US20040254369A1
公开(公告)日:2004-12-16
A process for preparing a compound of the formula
1
comprising:
(a) formation of 3(S)-(4-hydroxyphenyl)-3-methanesulfonyloxy-propionic acid methyl ester compound of the formula
2
(b) cyclization of the product of Step (a) with 4-fluoroaniline to yield 1-(4-fluorophenyl)-4(S)-(4-hydroxyphenyl)-azetidin-2-one.
Process for the preparation of chiral azetidinones
申请人:Framroze Patel Bomi
公开号:US20070129540A1
公开(公告)日:2007-06-07
Processes for preparing compounds of formula I are disclosed comprising the steps of:
(a) forming of chiral propionic acid ester compounds of formula V.
(b) reacting compounds of formula V with aniline compounds to yield compounds of formula I
Vanillin biosynthetic pathway enzyme from Vanilla planifolia
申请人:——
公开号:US20030070188A1
公开(公告)日:2003-04-10
Novel compositions and methods for improving vanillin production in cultured
Vanilla planifolia
and in intact plants are provided. Transgenic cells and plants having improved vanillin production are also provided. Isolated 4-hydroxybenzaldehyde synthase enzyme and nucleic acids encoding the enzyme are further provided.