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Ji Y, Plata RE, Regens CS, Hay M, Schmidt M, Razler T, Qiu Y, Geng P, Hsiao Y, Rosner T, Eastgate MD, Blackmond DG. Mono-Oxidation of Bidentate Bis-phosphines in Catalyst Activation: Kinetic and Mechanistic Studies of a Pd/Xantphos-Catalyzed C-H Functionalization. J Am Chem Soc 2015; 137:13272-81. [PMID: 26461028 DOI: 10.1021/jacs.5b01913] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Kinetic, spectroscopic, crystallographic, and computational studies probing a Pd-catalyzed C-H arylation reaction reveal that mono-oxidation of the bis-phosphine ligand is critical for the formation of the active catalyst. The bis-phosphine mono-oxide is shown to be a hemilabile, bidentate ligand for palladium. Isolation of the oxidative addition adduct, with structural elucidation by X-ray analysis, showed that the mono-oxide was catalytically competent, giving the same reaction rate in the productive reaction as the Pd(II)/xantphos precursor. A dual role for the carboxylate base in both catalyst activation and reaction turnover was demonstrated, along with the inhibiting effect of excess phosphine ligand. The generality of the role of phosphine mono-oxide complexes in Pd-catalyzed coupling processes is discussed.
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Affiliation(s)
- Yining Ji
- Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - R Erik Plata
- Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Christopher S Regens
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Michael Hay
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Michael Schmidt
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Thomas Razler
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Yuping Qiu
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Peng Geng
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Yi Hsiao
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Thorsten Rosner
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Martin D Eastgate
- Chemical Development, Bristol-Myers Squibb , One Squibb Drive, New Brunswick, New Jersey 08903, United States
| | - Donna G Blackmond
- Department of Chemistry, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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Affiliation(s)
- Vladimir V Grushin
- Central Research and Development, E I DuPont de Nemours & Co, Inc, Experimental Station, Wilmington, Delaware 19880-0328, USA
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Perera SD, Shaw BL, Thornton-Pett M. Crystal structure of [{Mo(=O)Cl2(O = PPh2C10H15 = NH)}2O]. A binuclear oxygen-bridged oxomolybdenum(V) complex containing chelating imino-phosphine oxide ligands. Inorganica Chim Acta 1995. [DOI: 10.1016/0020-1693(95)04492-r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Boorman P, Kraatz HB, Parvez M. Synthesis and characterization of the molybdenum(IV) oxo-selenolate complex [MoO(Ph2P(O)CH2CH2P(Ph)CH2CH2PPh2)(Se-2,4,6-(CH3)3C6H2)2]. Polyhedron 1993. [DOI: 10.1016/s0277-5387(00)84974-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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