First enantiopure imine CN-palladacycle of non-metallocenic planar chirality with the [2.2]paracyclophane backboneстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Herein the preparation of a planar chiral imine CN-palladacycle free of redox activity is reported. The direct cyclopalladation of a [2.2]paracyclophane-derived imine (HL) afforded the racemic dimer {Pd(eta2-L)(myu-Cl)}2 1; its ortho-palladated structure was confirmed by spectroscopic (1H and 31P NMR) data for mononuclear derivatives and the X-ray study of the phosphane adduct (eta2-L)PdCl(PPh3) 4. Both the (Spl,Spl)- and (Rpl,Rpl)-enantiomers of dimer 1 were isolated by the diastereoselective decoordination of the (RC)-valinate auxiliary ligand (Val) from the adduct (eta2-L)Pd(kappa2-Val) 5 using column chromatography on silica gel. The absolute configuration of these new CN-palladacycles was established by the independent
synthesis of the (Rpl,Rpl)-enantiomer of dimer 1 from the preresolved (Spl)-4-formyl[2.2]paracyclophane.