Rapid, enantioselective synthesis of the C1–C13 fragment of biselyngbyolide B
作者:Rakesh G. Thorat、Andrew M. Harned
DOI:10.1039/c7cc08004b
日期:——
A rapid synthesis of the C1–C13 fragment of biselynbyolide A and B is reported. The judicious use of catalytic transformations for C–C bond formation and stereocenter generation greatly minimizes the use of protecting groups and oxidation state changes, as compared to previously reported routes to similar fragments.
A newseries of sulfonated triarylphosphines with a strong π-acceptor character were synthesized by direct sulfonation of trifluoromethylated neutral phosphines. Due to the deactivating character of the trifluoromethyl group, high oleum concentration and the use of boric acid to prevent phosphine oxidation were required for the sulfonation step. The new sulfonated phosphines are water-soluble and more
New Tetraphosphorus Ligands for Highly Linear Selective Hydroformylation of Allyl and Vinyl Derivatives
作者:Chaoxian Cai、Shichao Yu、Bonan Cao、Xumu Zhang
DOI:10.1002/chem.201201396
日期:2012.8.6
New tetraphosphorusligands have been developed and applied in the rhodium‐catalyzedregioselectivehydroformylation of a variety of functionalized allyl and vinyl derivatives. Remarkably high linear selectivity was obtained by these tetraphosphorusligands. The ligand that bears strong electron‐withdrawing 2,4‐difluorophenyl groups is the most effective one in affording linear aldehydes. The Rh/tetraphosphorus
Chiral Phosphine−Phosphite Ligands with a Substituted Ethane Backbone. Influence of Conformational Effects in Rhodium-Catalyzed Asymmetric Olefin Hydrogenation and Hydroformylation Reactions
catalysts for the hydrogenation of methyl (Z)-α-acetamidocinnamate (MAC) and dimethyl itaconate. The catalyst comparison indicates that, for the two substrates, product configuration is determined by the configuration of the phosphite. Regarding matching and mismatchingeffects in these hydrogenations, small effects were observed in the reduction of MAC, while for the itaconate the bigger difference between
[EN] NOVEL DIAZAPHOSPHOLANE LIGANDS FOR ASYMMETRIC CATALYSIS<br/>[FR] NOUVEAUX LIGANDS DIAZAPHOSPHOLANE POUR CATALYSE ASYMETRIQUE
申请人:DOW CHEMICAL CO
公开号:WO2006026489A1
公开(公告)日:2006-03-09
This invention relates to a asymmetric hydroformylation processes in which a prochiral or chiral olefin is reacted with carbon monoxide and hydrogen in the presence of an optically active metal-ligand complex catalyst to produce an optically active aldehyde or a product derived from an optically active aldehyde.