Vinylic, allylic and homoallylic oxidations of alkenes via π- and σ-organopalladium complexes
作者:N.Yu. Kozitsyna、M.N. Vargaftik、I.I. Moiseev
DOI:10.1016/s0022-328x(99)00521-5
日期:2000.1
alkenes via intermediate organopalladiumcomplexes are discussed. The oxidation of propylene, hex-1-ene and cyclohexene by PdII acido complexescontaining achiral, racemic and chiral carboxylate ligands was first studied in a series of solvents other than acetic acid. Significant changes in the selectivity of the PdII-promoted reaction with changes in the solvent nature and ligand chirality were observed
Stereoselectivity in the Synthesis of Enol Esters from Chloromercurio Aldehydes and Acyl Chlorides
作者:Wakichi Fukuda、Hozumi Sato、Hiroshi Kakiuchi
DOI:10.1246/bcsj.59.751
日期:1986.3
Reactions of chloromercurio aldehydes with acylchlorides gave a variety of (Z)- and (E)-enol esters. The Z/E ratio of the enol esters is dependent on the structure of chloromercurio aldehydes but independent of that of acylchlorides. Z-Rich enol esters were prepared by acylation of 2-chloromercurio aldehydes derived from propanal, butanal, and 2-phenylethanal, while E-rich 1-acyloxy-1,3-butadiene
elimination. Two types of catalytically relevant species were identified, and the reactivities of these species, combined with the results of the kinetic studies, suggest that the rate-limiting step is the exchange of the COD ligand with the alkenyl ester. On the basis of the elucidated mechanism, the first catalytic coupling reaction using aromatic C–H bonds with C–O bonds of ethers was also developed
The Conversion of Glucose into an Early Zincophorin Synthon
作者:Jozua F. Bocysen、Cedric W. Holzapfel
DOI:10.1080/00397919508011759
日期:1995.5
stereoselective introduction of carbon nucleophiles at the 4- and 1-positions of a suitable pseudoglycal is shown to be an efficient route to the chiral 1,4-disubstituted tetrahydropyran (2), an early zincophorin synthon.