The [2,3]Wittig rearrangement of 2-alkenyloxyacetic acids and its applications to the stereocontrolled synthesis of β, γ-unsaturated aldehydes and conjugated dienoic acids
Dianions generated from 2-alkenyloxyacetic acids readily undergo the [2,3]sigmatropic rearrangement uhich can constitute the versatile synthetic sequences for the stereocontrolled synthesis of β,γ-unsaturated aldehydes and conjugated dienoic acids.
PROCESSES FOR CONVERSION OF BIOLOGICALLY DERIVED MEVALONIC ACID
申请人:Visolis, Inc.
公开号:US20160145227A1
公开(公告)日:2016-05-26
The invention relates to a process comprising reacting mevalonic acid, or a solution comprising mevalonic acid, to yield a first product or first product mixture, optionally in the presence of a solid catalyst and/or at elevated temperature and/or pressure. The invention further relates to a process comprising: (a) providing a microbial organism that expresses a biosynthetic mevalonic acid pathway; (b) growing the microbial organism in fermentation medium comprising suitable carbon substrates, whereby biobased mevalonic acid is produced; and (c) reacting said biobased mevalonic acid to yield a first product or first product mixture.
3,3-Disubstituted prop-2-enoic acids were selectively prepared in good yields under mild experimental conditions via palladium-catalysed cross-coupling of 3-substituted 3-iodobut-2-enoic acids with miscellaneous organometallic reagents using dichlorobis(acetonitrile)palladium(II) as catalyst and DMF as solvent.
Stereospecific synthesis of (Z) or (E)-3-methylalk-2-enoic acids
作者:Mohamed Abarbri、Jean-Luc Parrain、Alain Duchêne
DOI:10.1016/0040-4039(95)00285-k
日期:1995.4
The palladiumcatalysed coupling of organozinc or organotin reagents with 3-iodobut-2(or 3)-enoic acid is stereoselective and affords Z(or E)-3-methylalk-2-enoic acids. The method was applied to the synthesis of the E and Z stereoisomers of ocimenones and pseudo-tagetones.
A variety of substituted 5-alkyl(aryl)idene- and 5-[iodoalkyl(aryl)idene]-1H-pyrrol-2(5H)-ones were readily prepared with good yields under very mild reaction conditions by the iodocyclization of (2Z,4E)-dienamides and (Z)-alk-2-en-4-ynamides with iodine monochloride. 3-Ylidene-isoindolin-1-ones were also synthesized in moderate to good yields under the same conditions. The methodology proceeded with total regioselectivity in all cases and was applied to the synthesis of new unsaturated lactam compounds.