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Benincori T, Pilati T, Rizzo S, et al. 2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family. J Org Chem. 2005;70(14):5436-41doi: 10.1021/jo050390d.
Benincori, T., Pilati, T., Rizzo, S., Sannicolò, F., Burk, M. J., de Ferra, L., Ullucci, E., & Piccolo, O. (2005). 2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family. The Journal of organic chemistry, 70(14), 5436-41. https://doi.org/10.1021/jo050390d
Benincori, Tiziana, et al. "2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family." The Journal of organic chemistry vol. 70,14 (2005): 5436-41. doi: https://doi.org/10.1021/jo050390d
Benincori T, Pilati T, Rizzo S, Sannicolò F, Burk MJ, de Ferra L, Ullucci E, Piccolo O. 2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family. J Org Chem. 2005 Jul 08;70(14):5436-41. doi: 10.1021/jo050390d. PMID: 15989324.
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J Org Chem. 2005 Jul 08;70(14):5436-41. doi: 10.1021/jo050390d.

2,5-Dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene: first member of the hetero-DuPHOS family.

The Journal of organic chemistry

Tiziana Benincori, Tullio Pilati, Simona Rizzo, Franco Sannicolò, Mark J Burk, Lorenzo de Ferra, Elio Ullucci, Oreste Piccolo

Affiliations

  1. Dipartimento di Scienze Chimiche ed Ambientali, Università dell'Insubria, Via Valleggio, 11-22100-Como, Italy.

PMID: 15989324 DOI: 10.1021/jo050390d

Abstract

[reaction: see text] The 2,5-dimethyl-3,4-bis[(2R,5R)-2,5-dimethylphospholano]thiophene (UlluPHOS), a new thiophene-based analogue of (R,R)-1,2-bis(phospholano)benzene (Me-DuPHOS), was synthesized, geometrically and electronically characterized, and employed as ligand of Rh and Ru in some standard hydrogenation reactions of prostereogenic functionalized carbon-carbon and carbon-oxygen double bonds. The synthesis of UlluPHOS is much easier than that provided for Me-DuPHOS. UlluPHOS and Me-DuPHOS display very similar geometries, while the electronic availability of the former is higher than that exhibited by the latter. The Rh and Ru complexes of UlluPHOS produced excellent enantiomeric excesses (98.9-99.5%) in the hydrogenation of N-acetyl-alpha-enamino acids and reaction rates higher than those found when employing the analogous complexes of Me-DuPHOS.

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