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Volumn 52, Issue 19, 1996, Pages 6665-6684

Synthesis of functionalized phenolic derivatives via the benzannulation of dienylketenes formed by a thermal Wolff rearrangement of α-diazo-β-keto compounds

Author keywords

[No Author keywords available]

Indexed keywords

PHENOL DERIVATIVE; PHOSPHONIC ACID DERIVATIVE;

EID: 0029932465     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/0040-4020(96)00318-3     Document Type: Article
Times cited : (25)

References (59)
  • 2
    • 0025976645 scopus 로고
    • For recent reviews, see: a) Adams, J.; Spero, D. M. Tetrahedron 1991, 47, 1765-1808.
    • (1991) Tetrahedron , vol.47 , pp. 1765-1808
    • Adams, J.1    Spero, D.M.2
  • 9
    • 0001740156 scopus 로고
    • Ketene Cycloadditions
    • b) Hyatt, J. A.; Raynolds, P. W. Ketene Cycloadditions, Org.React. 1994, 45, pp. 159-646.
    • (1994) Org.React. , vol.45 , pp. 159-646
    • Hyatt, J.A.1    Raynolds, P.W.2
  • 38
    • 85087324777 scopus 로고
    • We have recently applied this ketene aromatic annulation to the field of isoxazole chemistry: Chen, Y.P.; Chantegrel, B.; Deshayes, C. Heterocyles 1995, 41, 175-186.
    • (1995) Heterocyles , vol.41 , pp. 175-186
    • Chen, Y.P.1    Chantegrel, B.2    Deshayes, C.3
  • 40
    • 85030188671 scopus 로고    scopus 로고
    • note
    • For generality's sake the geometric isomers of compounds 2, 3 and 4 will be designed as cis or trans if the unsaturated moiety (β-positioned for 2 or δ-positioned for 3 and 4) and the carbonyl group are "cis"or "trans" with respect to the carbon-carbon double bond.
  • 41
    • 85030189442 scopus 로고    scopus 로고
    • note
    • The configuration of the α,β carbon-carbon double bond in compounds 2a-d was established by the chemical shift of the β-proton: 5.96-6.10 ppm for the cis isomer and 6.88-7.00 for the trans isomer (see ref. 12a). The cis configuration of compound 2e was established by the chemical shifts of its aromatic protons (7.12-7.36) which appeared similar to those of 2a-«s (7.15-7.38) and different from those of 2a-trans (7.25-7.41 and 7.69-7.77). The configuration of 2g-trans was established on the basis of the chemical shift.of its vinylic proton.
  • 42
    • 85030188488 scopus 로고    scopus 로고
    • note
    • Pure analytical samples for NMR spectroscopy of each stereoisomer of compounds 2, 3a and 4 were obtained by column chromatography. In the case of 2e only the cis isomer was obtained. In the case of 2g the cis isomer was formed in a very small amount and was not characterized; the sequence was then conducted on 2g-trans .
  • 44
    • 85030194057 scopus 로고    scopus 로고
    • note
    • The thermolysis of α-diazo-γ-methoxy-γ,δ-vinyl- β-ketophosphonates furnishes the corresponding cyclobutenones in good to moderate yields (see ref 15).
  • 49
    • 85030189755 scopus 로고    scopus 로고
    • note
    • This compound was obtained in a 88% yield by conducting the same reaction in benzene at 160 °C (autoclave) for 3 h.
  • 51
    • 85030189706 scopus 로고    scopus 로고
    • note
    • When a toluene solution of 4f-trans was heated in a high-pressure autoclave for 3 h at 200°C, this compound disappeared completely (TLC), but led only to tars.
  • 58
    • 85030190662 scopus 로고    scopus 로고
    • note
    • 1H-NMR spectra of crude products. When compounds 3 and 4 were prepared from a mixture of steroisomers of compounds 2, we observed no significative modification in this ratio, excepted for 4h after purification (see text).
  • 59
    • 85030188375 scopus 로고    scopus 로고
    • note
    • Caution! This compound is potentially explosive.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.