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Volumn , Issue 7, 2004, Pages 1015-1020

Activated carbon-promoted oxidative aromatization of hantzsch 1,4-dihydropyridines and 1,3,5-trisubstituted pyrazolines using molecular oxygen

Author keywords

Activated carbon; Aromatization; Heterocycles; Oxidations; Pyrazolines; Pyridines

Indexed keywords

ACTIVATED CARBON; AROMATIZATION; OXIDATION;

EID: 2542504592     PISSN: 00397881     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2004-822343     Document Type: Article
Times cited : (139)

References (32)
  • 28
    • 2542419644 scopus 로고    scopus 로고
    • note
    • For example, the aromatization of pyrazoline 12 in MeCN and EtOH produced the corresponding pyrazole 18 only in low yield (1-33% yield). In the case of dihydropyridine, the use of MeCN and EtOH as a solvent was also ineffective.
  • 29
    • 0142026478 scopus 로고    scopus 로고
    • (a) Recently, we reported that substituted 9,10-dihydroanthracenes were aromatized to anthracenes in xylene under oxygen in the presence of activated carbon: Nakamichi, N.; Kawabata, H.; Hayashi, M. J. Org. Chem. 2003, 68, 8272.
    • (2003) J. Org. Chem. , vol.68 , pp. 8272
    • Nakamichi, N.1    Kawabata, H.2    Hayashi, M.3
  • 30
    • 0142106411 scopus 로고    scopus 로고
    • (b) We also reported that 2-arylbenzoxazoles were directly synthesized from substituted 2-amino-phenols and aldehydes by using activated carbon in xylene under oxygen: Kawashita, Y.; Nakamichi, N.; Kawabata, H.; Hayashi, M. Org. Lett. 2003, 5, 3713.
    • (2003) Org. Lett. , vol.5 , pp. 3713
    • Kawashita, Y.1    Nakamichi, N.2    Kawabata, H.3    Hayashi, M.4
  • 31
    • 2542471215 scopus 로고    scopus 로고
    • note
    • We used a mixture of o-, m-, and p-xylene.
  • 32
    • 2542426238 scopus 로고    scopus 로고
    • note
    • This conversion also proceeds efficiently in xylene instead of HOAc (for example, 81% yield for 7 h at 120°C, for substrate 12).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.