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Volumn 20, Issue 24, 2009, Pages 2835-2844

Synthesis of β,γ-disubstituted-γ-lactones through a Johnson-Claisen rearrangement: a short route to xylobovide, nor-canadensolide, canadensolide, sporothriolide and santolinolide

Author keywords

[No Author keywords available]

Indexed keywords

ALLYL ALCOHOL; CANADENSOLIDE; GAMMA LACTONE DERIVATIVE; LACTONE; NATURAL PRODUCT; SANTILINOLIDE; SPOROTHRIOLIDE; UNCLASSIFIED DRUG; XYLOBOVIDE;

EID: 74049121614     PISSN: 09574166     EISSN: 1362511X     Source Type: Journal    
DOI: 10.1016/j.tetasy.2009.11.018     Document Type: Article
Times cited : (20)

References (52)
  • 36
    • 74049123774 scopus 로고    scopus 로고
    • note
    • Enantiomeric excess was determined by chiral HPLC. Column: Chiralpak IA No. IA00CE-KL063, eluent: n-hexane/i-PrOH (95:5), flow rate: 0.5 mL/min, UV detector: 240 nm.
  • 45
    • 74049129307 scopus 로고    scopus 로고
    • note
    • 1H NMR of the mixture. Here anti/syn refers to the C3/C4 relative configuration of protons. (b) The reaction was not continued over 4 h so as to avoid the formation of higher amounts of the anti-diastereomer. When the reaction was carried out over shorter periods, lower yields were obtained with no change in the anti/syn ratio.
  • 46
    • 74049092224 scopus 로고    scopus 로고
    • note
    • The relative configuration of 20a and 20b is based on the comparison of the chemical shifts of Hb protons in the lactones. In 20a, the Hb proton is syn to the vinyl group and is shielded to δ 4.12 as compared to Hb (δ 4.38) in 20b.{A figure is presented}
  • 47
    • 74049156763 scopus 로고    scopus 로고
    • note
    • The syn-geometry in 20b is further confirmed after the ozonolysis reaction by the fact that it cyclizes to give the γ-(lactone-lactol) intermediate 6b (Scheme 3).
  • 48
    • 74049132480 scopus 로고    scopus 로고
    • note
    • 5i,5s
  • 49
    • 74049161941 scopus 로고    scopus 로고
    • note
    • 3CN, NaH/THF and NaHMDS/THF were attempted to epimerize the -carbon centre of aldehyde 24, but they failed to produce 6c.
  • 51
    • 15944379143 scopus 로고    scopus 로고
    • Gao, D.; O'Doherty, G. A. Org. Lett. 2005, 7, 1069. (b) Gao, D.; O'Doherty, G. A. J. Org. Chem. 2005, 70, 9932. (c) The enantiomeric excess reported in the synthesis of 26 is only 85% ee. Hence the compound 26 prepared from (R,R)-diethyl tartrate was used further.
    • (a) Gao, D.; O'Doherty, G. A. Org. Lett. 2005, 7, 1069. (b) Gao, D.; O'Doherty, G. A. J. Org. Chem. 2005, 70, 9932. (c) The enantiomeric excess reported in the synthesis of 26 is only 85% ee. Hence the compound 26 prepared from (R,R)-diethyl tartrate was used further.
  • 52
    • 74049158221 scopus 로고    scopus 로고
    • note
    • 5o


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.