Novel chiral dithioethers derived from l-tartaric acid
摘要:
The synthesis of a new family of systematically modified chiral dithioethers to be used as ligands is described. Phenylthioether derivative 5 and fluorine-containing dithioether ligands 6-8 and 13-15 were prepared by direct reaction of phenylthiol and o-, m- or p-fluorophenylthiol with two different ditriflate derivatives based on the L-tartaric skeleton. The chiral ditriflate 12 containing a dioxolane moiety was reacted with ethane- and propanedithiol. producing cyclic dithioethers 16 and 17, respectively, in good yields (approximate to 50%). The analogous ditriflate 4 with benzyl ether protecting groups, having a skeleton without restricted rotation, gave the thiolane 9 as the main product. (C) 2002 Elsevier Science Ltd. All rights reserved.
Palladiumallylic systems containing modular chiral dithioether ligands were chosen as catalysts for a systematic study of homodonor ligands in allylicalkylation reactions. For this purpose, new type-DMPS (4−6) and -DEGUS (8, 9) ligands were synthesized. Dithioethers 4−6 afforded high activities and excellent selectivities in all Pd-catalyzed allylic reactions. Particularly the Pd/6 catalytic system
Novel chiral dithioethers derived from l-tartaric acid
作者:Leticia Flores-Santos、Erika Martin、Montserrat Diéguez、Anna M. Masdeu-Bultó、Carmen Claver
DOI:10.1016/s0957-4166(01)00504-3
日期:2001.11
The synthesis of a new family of systematically modified chiral dithioethers to be used as ligands is described. Phenylthioether derivative 5 and fluorine-containing dithioether ligands 6-8 and 13-15 were prepared by direct reaction of phenylthiol and o-, m- or p-fluorophenylthiol with two different ditriflate derivatives based on the L-tartaric skeleton. The chiral ditriflate 12 containing a dioxolane moiety was reacted with ethane- and propanedithiol. producing cyclic dithioethers 16 and 17, respectively, in good yields (approximate to 50%). The analogous ditriflate 4 with benzyl ether protecting groups, having a skeleton without restricted rotation, gave the thiolane 9 as the main product. (C) 2002 Elsevier Science Ltd. All rights reserved.
Cationic Iridium Complexes with Chiral Dithioether Ligands: Synthesis, Characterisation and Reactivity under Hydrogenation Conditions
作者:Leticia Flores‐Santos、Erika Martin、Ali Aghmiz、Montserrat Diéguez、Carmen Claver、Anna M. Masdeu‐Bultó、Miguel Ángel Muñoz‐Hernández
DOI:10.1002/ejic.200400828
日期:2005.6
S-inversion in complexes 8 and 9. The solid-statestructure of complex 10b shows only one diastereomer with the sulfur substituents in a relative anti disposition and in an overall configuration of SCSCSSSS at the coordinated dithioether ligand. Iridium complexes containing seven- and six-membered metallacycles (6b–d, 7b,c, 10a,b) react with the substrate through S-ligand substitution, and the rate of