A direct and metal free one-pot method has been developed for the stereoselectivesynthesis of tetrahydropyrimidinone derivatives from a vinyl arene and formaldehyde using a tartaric acid–dimethylurea (TA : DMU) melt as a green reaction medium. The substrate scope of this method is very general and the tetrahydropyrimidinone (THPM) derivatives are synthesized in good yields with a high degree of diastereoselectivity
Nickel-catalyzed Heck reaction of cycloalkenes using aryl sulfonates and pivalates
作者:Jianrong Steve Zhou、Xiaolei Huang、Shenghan Teng、Yonggui Robin Chi
DOI:10.1039/d1cc00634g
日期:——
Nickel-catalyzed Heck reaction of cycloalkenes delivers unusual conjugated arylated isomers. Nickel(0) catalysts ligated by chelating dialkylphosphines effectively activate not only aryl triflates as electrophiles, but also less reactive aryl mesylates, tosylates and pivalates. The omission of bases allows nickel hydride species to exist long enough to perform in situ olefin isomerization of initial
Preparation and chemistry of vinyl triflates. 16. Mechanism of alkylation of aromatic substrates
作者:Peter J. Stang、Albert G. Anderson
DOI:10.1021/ja00473a033
日期:1978.3
Achieving Vinylic Selectivity in Mizoroki-Heck Reaction of Cyclic Olefins
作者:Xiaojin Wu、Yunpeng Lu、Hajime Hirao、Jianrong Steve Zhou
DOI:10.1002/chem.201204427
日期:2013.5.3
In Heck reactions of cyclicolefins, the products usually have aryl groups that end up at the allylic and/or homoallylic position. We herein report new selectivity that adds aryl groups to the vinylic position. Cyclicolefins of various ring size worked well. The desired isomers were produced by palladium–hydride‐catalyzed isomerization of the initial products. Thus, a specific catalyst must be used
Process for the manufacture of new carboxylic acids
申请人:Ciba-Geigy AG
公开号:US04115416A1
公开(公告)日:1978-09-19
.alpha.-Phenoxyacetic acids, in which the .alpha.-position is substituted by an alkyl residue with 5 to 12 carbon atoms and the phenyl residue is substituted by a cycloaliphatic hydrocarbon residue which is unsaturated in the 1-position and is only singly unsaturated, and their esters and amides are useful as hypolipidaemic agents.