New planar chiral P,N-ligands containing tricarbonyl(arene)chromium for enantioselective asymmetric hydroboration of styrenes |
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| Affiliation: | 1. Dipartimento di Chimica “Ugo Schiff”, Università degli Studi di Firenze, via della Lastruccia 3-13, Sesto Fiorentino, FI, Italy;2. Consorzio Interuniversitario Reattività Chimica e Catalisi (CIRCC), via Celso Ulpiani 27, 70126 Bari, Italy;3. IENI-CNR and INSTM, Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy;4. Istituto di Chimica dei Composti OrganoMetallici (ICCOM) CNR, via Madonna del Piano 10, 50019 Sesto Fiorentino, FI, Italy;5. Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca'' Foscari Venezia, via Torino 155, 30170 Venezia Mestre, Italy;6. SCSOP, Via Bornò 5, 23896 Sirtori, LC, Italy |
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| Abstract: | Optically active (1,2-disubstituted arene) chromium tricarbonyl complexes 2A–2D with a pyridyl and a phosphorus group in the two ortho benzylic positions have been stereoselectively synthesized from a commercially available (+)-(4,6-O-benzylidene)methyl-α-d-glucopyranoside. These chromium complexes have been used as chiral ligands in the preparation of rhodium catalysts for the hydroboration of styrene derivatives. High enantioselectivities were observed in the hydroboration of vinylarenes. |
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