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Volumn 11, Issue 14, 2009, Pages 3148-3151

Stereoselective quaternary center construction via atom-transfer radical cyclization using silicon tethers on acyclic precursors

Author keywords

[No Author keywords available]

Indexed keywords

ALLYL COMPOUND; SILICON; VINYL DERIVATIVE;

EID: 67650293064     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol901126y     Document Type: Article
Times cited : (12)

References (52)
  • 1
    • 0001521888 scopus 로고
    • For reviews, see: a
    • For reviews, see: (a) Fuji, K. Chem. Rev. 1993, 93, 2037.
    • (1993) Chem. Rev , vol.93 , pp. 2037
    • Fuji, K.1
  • 23
    • 67650332341 scopus 로고    scopus 로고
    • A ratio of 4:1 in favor of syn was obtained when R2 is a methyl and the allylation reaction done in refluxing hexanes see ref 8b, In the case of R2, H, the ratio obtained was 6:1. The secondary hydroxyl group had to be protected in this case in a borinate and a monodentate Lewis acid used to activate the ester, Cardinal-David B. Ph.D. Thesis, Université de Montréal, 2008
    • 2 = H, the ratio obtained was 6:1. The secondary hydroxyl group had to be protected in this case in a borinate and a monodentate Lewis acid used to activate the ester. (Cardinal-David B. Ph.D. Thesis, Université de Montréal, 2008).
  • 45
    • 33845183013 scopus 로고
    • For references on the β-silicon effect (also called silicon hyperconjugation, see: a
    • For references on the β-silicon effect (also called silicon hyperconjugation), see: (a) Ibrahim, M. R.; Jorgensen, W. L. J. Am. Chem. Soc. 1989, 111, 819.
    • (1989) J. Am. Chem. Soc , vol.111 , pp. 819
    • Ibrahim, M.R.1    Jorgensen, W.L.2
  • 49
    • 67650332340 scopus 로고    scopus 로고
    • The optimization of this reaction was initially performed in benzene to avoid benzylic bromination. However, few reactions done in toluene demonstrate that good yields and excellent diastereoselectivites can be obtained which represent a great alternative to benzene (entries 1, 4, 5, 7, and 8 in Table 1 and entry 2 in Table 2).
    • The optimization of this reaction was initially performed in benzene to avoid benzylic bromination. However, few reactions done in toluene demonstrate that good yields and excellent diastereoselectivites can be obtained which represent a great alternative to benzene (entries 1, 4, 5, 7, and 8 in Table 1 and entry 2 in Table 2).
  • 50
    • 67650289087 scopus 로고    scopus 로고
    • The cyclic intermediates are unstable on silica. The allylated or vinylated products were observed in these cases
    • The cyclic intermediates are unstable on silica. The allylated or vinylated products were observed in these cases.
  • 51
    • 67650329290 scopus 로고    scopus 로고
    • See the Supporting Information
    • See the Supporting Information.
  • 52
    • 67650292344 scopus 로고    scopus 로고
    • See the Supporting Information for more details on the proof of structure of intermediates 48, 50, and 52a,b
    • See the Supporting Information for more details on the proof of structure of intermediates 48, 50, and 52a,b.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.