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Volumn 50, Issue 17, 1994, Pages 5169-5180

Diels-Alder reactions with 2-methylpyridazin-3(2H)-ones bearing electron-withdrawing substituents at the 4- or 5-position

Author keywords

[No Author keywords available]

Indexed keywords

PYRIDAZINE DERIVATIVE;

EID: 0028204794     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(01)90427-2     Document Type: Article
Times cited : (5)

References (34)
  • 12
    • 84986464142 scopus 로고
    • 1,3-Dipolar Cycloadditions of 2-Diazopropane to 1-Phenyl-bis-s-triazolo[4,3-b:3′,4′-f]pyridazine. The Synthesis of 11,11-Dimethyl-11H-pyrazolo [3,4-d]bis-s-triazolo[4,3-b:3′,4′-f]pyridazines, Derivatives of a Novel Heterocyclic System
    • and references cited therein
    • (1986) Synthesis , pp. 78
    • Furlan1    Stanovnik2    Tisler3
  • 15
    • 84913990559 scopus 로고    scopus 로고
    • Very recently, after the completion of our work, two communications of other workers
  • 17
    • 0000965847 scopus 로고
    • Kinetic and Theoretic Aspects of Regiochemistry in the Reaction of 4,5-Dihalo-3(2H)-pyridazinones with Benzylamines
    • have appeared in which three substituted pyridazinones have been used as dienophiles to give mainly the aromatized phthalazinones and only in one case was the initial Diels-Alder adduct isolated.
    • (1993) HETEROCYCLES , vol.36 , pp. 1975
    • Mátyus1    Fuji2    Tanaka3
  • 19
    • 84913990557 scopus 로고    scopus 로고
    • Only one enantiomer is represented for racemic compounds of type 6, 7, 9, and 10.
  • 20
    • 84913990556 scopus 로고    scopus 로고
    • 1H-NMR spectrum of the crude reaction mixture, the N-methyl protons for the major endo-isomer (δ 3.32) are shielded relative to those of the minor exo-isomer (δ 3.42); the same order is observed for the H-4 protons, major δ 7.01, minor δ 7.20.
  • 21
    • 84913990555 scopus 로고    scopus 로고
    • Similar isomerization of 9′b was not attempted because of the difficulty of obtaining pure samples of this isomer.
  • 22
    • 84913990554 scopus 로고    scopus 로고
    • 2c,d in related adducts of other heterocylic dienophiles. In agreement with this structural assignment are the values of the coupling constants of H-4a in 9″c, noticeably different from those of 9b and 9'b (see table II), which suggests a different stereochemistry.
  • 30
    • 84981838661 scopus 로고
    • Heilmittelchemische Studien in der heterocyclischen Reihe. 5. Mitteilung. Pyridazine II. Eine neue Pyridazinsynthese
    • (1954) Helvetica Chimica Acta , vol.37 , pp. 134
    • Schmidt1    Druey2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.