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Volumn 71, Issue 16, 2006, Pages 5930-5935

Ring expansion of functionalized octahydroindoles to enantiopure cis-decahydroquinolines

Author keywords

[No Author keywords available]

Indexed keywords

DERIVATIVES; ISOMERS; REACTION KINETICS; SYNTHESIS (CHEMICAL);

EID: 33746876014     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo060592p     Document Type: Article
Times cited : (28)

References (52)
  • 1
    • 4544253397 scopus 로고    scopus 로고
    • and references therein
    • Pu, X.; Ma, D. Angew. Chem., Int. Ed. 2004, 43, 4222-4225 and references therein.
    • (2004) Angew. Chem., Int. Ed. , vol.43 , pp. 4222-4225
    • Pu, X.1    Ma, D.2
  • 30
    • 0003098583 scopus 로고
    • For some applications in natural products synthesis, see (a) Harding, K. E.; Burks, S. R. J. Org. Chem. 1984, 49, 40-44.
    • (1984) J. Org. Chem. , vol.49 , pp. 40-44
    • Harding, K.E.1    Burks, S.R.2
  • 40
    • 0036817159 scopus 로고    scopus 로고
    • For a review on the synthesis of six-membered nitrogen-containing compounds via aziridinium intermediates, see Cossy, J.; Gomez Pardo, D. Chemtracts 2002, 15, 579-605.
    • (2002) Chemtracts , vol.15 , pp. 579-605
    • Cossy, J.1    Gomez Pardo, D.2
  • 43
    • 33746900376 scopus 로고    scopus 로고
    • note
    • Using LS-Selectride as the reducing agent, ketone 7 furnished stereoselectively alcohol 10a.
  • 44
    • 33746865233 scopus 로고    scopus 로고
    • note
    • The chemical shift of H-3a and H-7a appears more deshielded in the exo derivatives than in the endo compounds, due to the syn relationship of the nitrogen lone pair with both protons in the exo series (Figure 2).
  • 46
    • 33746933399 scopus 로고    scopus 로고
    • note
    • 13C NMR data, see Supporting Information, Table 2. (Diagram presented)
  • 47
    • 33746916739 scopus 로고    scopus 로고
    • note
    • The use of microwave conditions did not give satisfactory results either.
  • 48
    • 33746889379 scopus 로고    scopus 로고
    • note
    • 13C NMR spectrum of the reaction mixture. For NMR data of 9b-12b, see Supporting Information. (Diagram presented)
  • 49
    • 33746896145 scopus 로고    scopus 로고
    • note
    • There are scarcely any examples of ring enlargement via aziridinium ions from secondary alcohols, and they are always of the benzylic type (see refs 9b and 10b,c).
  • 50
    • 33746890474 scopus 로고    scopus 로고
    • note
    • 3N, then AgOAc.
  • 51
    • 33746892565 scopus 로고    scopus 로고
    • note
    • The use of silver trifluoroacetate instead of silver acetate slightly increased the yield of the expanded compound, which gave alcohol 21 (58%) after a basic workup (see Scheme 6).
  • 52
    • 33746908118 scopus 로고    scopus 로고
    • note
    • The use of tetrabutylammonium acetate did not improve the course of the reaction. From 9a, a mixture of acetates 17 (38%) and 9c (34%) were isolated, whereas from 10a-12a, more complex reaction mixtures were formed with the decahydroquinolines 18, 19, and 20 being obtained in a yield lower than 10%.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.