Industrially important triaryl phosphites, traditionally prepared from PCl3, have been synthesized by a diphenyl diselenide-catalyzed one-step procedure involving white phosphorus and phenols, which provides a halogen- and transition metal-free way to these compounds. Subsequent oxidation of triaryl phosphites produces triaryl phosphates and triaryl thiophosphates. Phosphorotrithioates are also prepared
申请人:UNIVERSITY COURT OF THE UNIVERSITY OF ST ANDREWS
公开号:US20140228563A1
公开(公告)日:2014-08-14
Cis and trans ruthenium complexes that can be used as catalysts for ring opening metathesis polymerisation (ROMP) are described. The complexes are generally square pyramidal in nature, having two anionic ligands X. Corresponding cationic complexes where one or both of the anionic ligands X are replaced by a non-co-ordinating anionic ligand are also described. Polymers such as polydicyclopentadiene (PDCPD) can be prepared using the catalysts.
[EN] SYNTHESIS OF CEPHALOSPORIN COMPOUNDS<br/>[FR] SYNTHÈSE DE COMPOSÉS DE CÉPHALOSPORINE
申请人:MERCK SHARP & DOHME
公开号:WO2016025839A1
公开(公告)日:2016-02-18
Provided herein is a method for the synthesis of cephalosporin antibiotic compounds comprising a palladium-catalyzed coupling reaction. Provided herein are methods for the synthesis of cephalosporin compounds of formula (I) employing a palladium-catalyzed alkylation reaction, as well as compositions related to the same. In an aspect, provided herein is a method for preparing a compound of formula (II), or a salt thereof, comprising the step of admixing, e.g., reacting, a compound of formula (III), or a salt thereof, with a nucleophile (Nuc) in the presence of reagents comprising: (a) a palladium source; and (b) a palladium-binding ligand, to form a compound of formula (II), or a salt thereof.