A universal allyl linker for solid-phase synthesis
作者:Xiaohu Zhang、Roger A. Jones
DOI:10.1016/0040-4039(96)00714-9
日期:1996.5
We report synthesis of a universalallyllinker for solid-phasesynthesis, 9-O-(4,4′-Dimethoxytrityl)-10-undecenoic (3), that has a reactive terminal double bond. Since allyl cleavage occurs under conditions orthogonal to those used during the solid-phasesynthesis and deprotection of DNA or RNA fragments, this linker extends the range of post-synthetic manipulations that can be carried out without
allylic alcohols of ω‐alkenoic acids and derivatives thereof are highly important building blocks for the synthesis of biologically active compounds. The direct enantioselective CH oxidation of linear terminal olefins offers the shortest route toward these compounds, but known synthetic methods are limited and suffer from low selectivities. Described herein is an enzymatic approach using the P450
The present invention provides an efficient synthetic method of &agr;-ketol unsaturated fatty acid having a double bond at a &bgr;-position to the ketone group thereof. It comprises the steps of: preparing compound (4) by reacting monosubstituted acetylene (2) with epoxide (3); and preparing &agr;-ketol unsaturated fatty acid (1) from said compound (4) as shown in Reaction Formula 1:
1
wherein R
1
represents an alkyl group of 1-18 carbon atoms or an aliphatic hydrocarbon group of 2-18 carbon atoms having 1-5 double or triple bonds at given positions; R
2
represents a protecting group for a hydroxyl group; R
3
represents a protecting group for a carboxyl group; R is identical to R
1
or, when R
1
has one or more triple bonds, represents an aliphatic hydrocarbon group in which each triple bond of R
1
is converted to a double bond; and A represents an alkylene group of 1-18 carbon atoms.
Oxidation of 10-undecenoic acid by cytochrome P450BM-3 and its Compound I transient
作者:Xiaohong Chen、Zhi Su、John H. Horner、Martin Newcomb
DOI:10.1039/c1ob06035j
日期:——
Oxidations of 10-undecenoicacid by cytochrome P450BM-3 and its Compound I transient were studied. The only product formed in Compound I oxidations was 10,11-epoxyundecanoic acid, whereas the enzyme under turnover conditions gave the epoxide and 9-hydroxy-10-undecenoic acid in a 10 : 90 ratio. Kinetic studies at 0 °C of oxidations by Compounds I formed by MCPBA oxidation and by a photo-oxidation pathway
METHOD OF SYNTHESIZING ALPHA-KETOL UNSATURATED FATTY ACID
申请人:Shiseido Co., Ltd.
公开号:EP1357106A1
公开(公告)日:2003-10-29
The present invention provides an efficient synthetic method of α-ketol unsaturated fatty acid having a double bond at a β-position to the ketone group thereof. It comprises the steps of: preparing compound (4) by reacting monosubstituted acetylene (2) with epoxide (3); and preparing α -ketol unsaturated fatty acid (1) from said compound (4) as shown in Reaction Formula 1:
wherein R1 represents an alkyl group of 1-18 carbon atoms or an aliphatic hydrocarbon group of 2-18 carbon atoms having 1-5 double or triple bonds at given positions; R2 represents a protecting group for a hydroxyl group; R3 represents a protecting group for a carboxyl group; R is identical to R1 or, when R1 has one or more triple bonds, represents an aliphatic hydrocarbon group in which each triple bond of R1 is converted to a double bond; and A represents an alkylene group of 1-18 carbon atoms.