Enantiomerically pure cyclopalladated diazaphospholidineстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Enantiomerically pure (S)-2-(anilinomethyl)pyrrolidine (S)-2 was obtained from (S)-proline using a modified four-step procedure in a total yield of 56%. Diamine (S)-2 was converted to diazaphospholidine (S)-1 using oTolP(NMe2)2. The enantiomeric purity of ligand (S)-1 and diamine (S)-2 was determined by 31P and 1H NMR spectroscopy, respectively, using a CN-palladacycle for their chiral derivatization. Direct cyclopalladation of (S)-1, using Pd(OAc)2 in toluene under mild conditions regioselectively afforded the cyclopalladated
complex with the (sp2)C–Pd bond. The aromatic C–H bond activation was confirmed by NMR spectral data and X-ray diffraction study of the PPh3 derivative of the new P*,C*,N*-chiral phosphapalladacycle