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Volumn , Issue 13, 2007, Pages 2077-2080

Nickel-catalyzed cross-coupling reactions of aryltitanium(IV) alkoxides with aryl halides

Author keywords

Cross coupling; Nickel; Organotitanium reagents

Indexed keywords

ARYLTITANIUM ALKOXIDE; HALIDE; HETEROCYCLIC COMPOUND; NICKEL; UNCLASSIFIED DRUG;

EID: 34548166571     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2007-984906     Document Type: Article
Times cited : (27)

References (34)
  • 1
    • 20544450502 scopus 로고    scopus 로고
    • 2nd ed, de Meijere, A, Diederich, F, Eds, Wiley-VCH: Weinheim
    • (a) Metal-Catalyzed Cross-Coupling Reactions, 2nd ed.; de Meijere, A.; Diederich, F., Eds.; Wiley-VCH: Weinheim. 2004.
    • (2004) Metal-Catalyzed Cross-Coupling Reactions
  • 22
    • 34548168297 scopus 로고    scopus 로고
    • The NHC ligand itself is generated by deprotonation with the organometallic reagent. See also references above.
    • (e) The NHC ligand itself is generated by deprotonation with the organometallic reagent. See also references above.
  • 24
    • 27644540188 scopus 로고    scopus 로고
    • Polar solvents such as NMP, NEP (N-ethyl-2-pyrrolidinone), DMPU or DME were not effective as co-solvents, as it is known in other cross-coupling reactions. See also: Gavryushin, A.; Kofink, C.; Manolikakes, G.; Knochel, P. Org. Lett. 2005, 7, 4871.
    • Polar solvents such as NMP, NEP (N-ethyl-2-pyrrolidinone), DMPU or DME were not effective as co-solvents, as it is known in other cross-coupling reactions. See also: Gavryushin, A.; Kofink, C.; Manolikakes, G.; Knochel, P. Org. Lett. 2005, 7, 4871.
  • 33
    • 34548151788 scopus 로고    scopus 로고
    • Not using NMP leads to heterogeneous reactions and lower yields
    • Not using NMP leads to heterogeneous reactions and lower yields.
  • 34
    • 34548186896 scopus 로고    scopus 로고
    • Typical Procedure for the Cross-Coupling Reaction; Preparation of Biphenyl-4-carboxylic Acid Ethyl Ester (3a, A flame-dried flask equipped with a magnetic stirring bar, an argon inlet, and a septum was charged with a Ti(OEt)4 solution (1.0 mL, 1.5 M in THF, First phenyl-magnesium chloride (0.84 mL, 1.79 M in THF) was added dropwise at 0°C. then Ni(acac)2 (1.3 mg, 0.005 mmol, ligand 4 (2.1 mg, 0.005 mmol) and 4-bromobenzoic acid ethyl ester (2a; 229 mg, 1.00 mmol) were added. The reaction mixture was stirred for 3 h at r.t. Then the mixture was quenched with a sat. NH4Cl solution and extracted with Et2O. Column chromatography (pentane-Et2O, 9:1) of the crude residue yielded 3a as colorless solid 215 mg, 95
    • 2O, 9:1) of the crude residue yielded 3a as colorless solid (215 mg, 95%).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.