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Volumn 71, Issue 17, 2006, Pages 6374-6381

Electrochemically induced cascade reaction for the assembly of libraries of biologically relevant 1,4-benzoxazine derivatives

Author keywords

[No Author keywords available]

Indexed keywords

CASCADE REACTION; CYCLIC TRANSITION; CYCLOADDITION; METAL FREE CONDITIONS;

EID: 33747445490     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo060452f     Document Type: Article
Times cited : (49)

References (54)
  • 1
    • 9644303130 scopus 로고    scopus 로고
    • and references therein
    • For a recent review on biologically active 1,4-benzoxazine derivatives, see the following: (a) Achari, B.; Mandal, S. B.; Dutta, P. K.; Chowdhury, C. Synlett 2004, 2449 and references therein.
    • (2004) Synlett , pp. 2449
    • Achari, B.1    Mandal, S.B.2    Dutta, P.K.3    Chowdhury, C.4
  • 10
    • 0013611759 scopus 로고    scopus 로고
    • Schaumann, E.; Ed.; Georg Thieme: Stuttgart, Germany
    • See also (b) Teller, J. In Houben-Weyl Methods of Organic Chemistry; Schaumann, E.; Ed.; Georg Thieme: Stuttgart, Germany, 1997; Vol. E 9a, p 141.
    • (1997) Houben-Weyl Methods of Organic Chemistry , vol.E 9A , pp. 141
    • Teller, J.1
  • 11
    • 84943425073 scopus 로고
    • Katritzky, A. R.; Rees, C. W. Eds.; Oxford
    • (c) Sainsbury, M. In Comprehensive Heterocyclic Chemistry; Katritzky, A. R.; Rees, C. W. Eds.; Oxford, 1984; Vol. 3, p 995.
    • (1984) Comprehensive Heterocyclic Chemistry , vol.3 , pp. 995
    • Sainsbury, M.1
  • 12
    • 45449097286 scopus 로고
    • For reviews on hetero Diels-Alder reactions see (a) Boger, D. L. Tetrahedron 1983, 39, 2869.
    • (1983) Tetrahedron , vol.39 , pp. 2869
    • Boger, D.L.1
  • 37
  • 43
    • 33747431251 scopus 로고    scopus 로고
    • note
    • Bromosubstituted aromatic rings are particularly attractive in diversity-oriented synthesis because they can be easily transformed into differently substituted aromatics by cross-coupling reactions.
  • 44
    • 33747440045 scopus 로고    scopus 로고
    • note
    • As shown in Figure 3, in both compounds, a strong intramolecular hydrogen bond is established between the hydroxyl groups O9-H and the oxygen atoms O10 (for 3f, distances O9⋯O10 = 2.547(3) Å, O9-H = 1.27, HO9⋯O10 = 1.47 Å, angle O-H⋯O = 136.2°; for 3h, distances 09⋯O10 = 2.603(3) Å, O9-H = 1.16, HO9⋯O10 = 1.59 Å, angle O-H⋯O = 141.2°), leading to respective shorter bonds C5-OH of 1.360(3) and 1.354(3) Å, and longer bonds C11-O10 of 1.247(3) and 1.245(3) Å. Torsion angle values and mean plane calculations show that the oxazine rings are in a half-chair conformation with atoms C2 and C3 deviated by, respectively, -0.349(3) and 0.435(2) Å in 3f and by -0.373(2) and 0.446-(2) Å in 3h, from the mean plane of the other four atoms. The mean planes of the benzoxazine and the phenyl ring at C11 are tilted by 132.5° in 3f and 101.5° in 3h.
  • 45
    • 33747446282 scopus 로고    scopus 로고
    • note
    • For the two enantiomers, torsion angle and mean plane calculations show that the oxazine rings exhibit a nearly C3 envelope conformation, with atom C3 deviated by -0.629(1) Å in 5e and -0.690(2) Å in 5f from the mean plane of the other five atoms. In 5f. the nitro group lies in the mean plane of the benzoxazine (torsion angles C5-C6-N9-O10 = 5.7-(3)°, C7-C6-N9-O11 = 4.6(3)°). However, differences appear at the C2 atom where the morpholine ring is fixed in an axial position (H2 atom being equatorial) in 5e, while it is the opposite in 5f. Moreover, the cyclohexyl group at C3 is orientated differently.
  • 47
    • 0002016858 scopus 로고    scopus 로고
    • and references therein
    • For a review on cycloaddition reactions of o-quinone heterodienes see Nair, V.; Kumar, S. Synlett 1996, 1143 and references therein.
    • (1996) Synlett , pp. 1143
    • Nair, V.1    Kumar, S.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.