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Volumn 48, Issue 27, 2007, Pages 4669-4673

Palladium-complex-catalyzed regioselective Markovnikov addition reaction and dehydrogenative double phosphinylation to terminal alkynes with diphenylphosphine oxide

Author keywords

Diphenylphosphine oxide; Homogeneous catalysis; Hydrophosphinylation; Palladium

Indexed keywords

1,2 DIPHENYLPHOSPHINYL 1 ALKENE; ALKENE DERIVATIVE; ALKYNE DERIVATIVE; DI(O TOLYL) PHENYLPHOSPHINE; DIPHENYLPHOSPHINE OXIDE; OXIDE; PALLADIUM 1,2 BIS(DIPHENYLPHOSPHINO)ETHANE; PALLADIUM COMPLEX; PHOSPHINE DERIVATIVE; PROPIONITRILE; UNCLASSIFIED DRUG;

EID: 34249865379     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2007.05.039     Document Type: Article
Times cited : (36)

References (82)
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    • Quite recently Oshima and co-workers reported an elegant radical reaction involving chlorodiphenylphosphine, diphenylphosphine, triethylamine, and a terminal alkyne leading to a 1,2-bis(diphenylphosphino)alkene, which could be readily oxidized with hydrogen peroxide to furnish a 1,2-bis(diphenylphosphinyl)alkene. See:
    • Quite recently Oshima and co-workers reported an elegant radical reaction involving chlorodiphenylphosphine, diphenylphosphine, triethylamine, and a terminal alkyne leading to a 1,2-bis(diphenylphosphino)alkene, which could be readily oxidized with hydrogen peroxide to furnish a 1,2-bis(diphenylphosphinyl)alkene. See:. Sato A., Yorimitsu H., and Oshima K. Angew. Chem., Int. Ed. 44 (2005) 1694
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    • note
    • In view of possible oligomerization of 1a, we used a slight excess of 1a. For clearer understanding of the reaction profile forming both single and double phosphinylated products (3a, 4a, 5a, and 6a), however, the product yields in this particular reaction were tentatively calculated based on the quantity of 1a charged.
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    • note
    • The higher branch-selectivity in this experiment (100 °C), as compared with the branch-selectivity (<5%) observed at 70 °C suggests that the higher reaction temperature is also a factor that enhances the branch-selectivity. See Ref. 7b.
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    • note
    • Conversions of diphenylphosphine oxide in the reactions run in n-octane and ethanol were only 40% and 18%, respectively.
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    • note
    • 3 and column chromatography using hexane/ethyl acetate (1/1) afforded 3a in 83% yield.
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    • note
    • Despite the low yield of 4k, 5k, and 6k were not formed at all. We thank reviewers who recommended us to examine the reaction of trimethylsilylacetylene, which displayed the exceptional behavior.
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    • Secondary phosphine oxides exist in two tautomeric isomers, P(O)H and P(OH), the former being dominant in the equilibrium. See:. Bailey W.J., and Fox R.B. J. Org. Chem. 28 (1963) 531
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    • note
    • Obtained from a mixture resulting from an uncatalyzed reaction of (p-tolylethynyl)diphenylphosphine oxide (8) with 2 run at 100 °C for 3 h in toluene (vide infra).
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    • note
    • In the present reaction of p-tolylacetylene, we do have detected a trace of (p-tolylethynyl)diphenylphosphine oxide.
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    • For mechanistic aspects of apparent trans-insertion, see:. Nakamura A., and Otsuka S. J. Mol. Catal. 1 (1975/76) 285
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.