메뉴 건너뛰기




Volumn 47, Issue 9, 2006, Pages 1371-1374

Novel and stereocontrolled asymmetric synthesis of a new naturally occurring styryllactone, (+)-cardiobutanolide

Author keywords

Cardiobutanolide; Glucuronolactone; Grignard addition; Stereoselective reduction; Styryllactone

Indexed keywords

BUTYROLACTONE; CARDIOBUTANOLIDE; UNCLASSIFIED DRUG;

EID: 31444435075     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2005.12.113     Document Type: Article
Times cited : (23)

References (43)
  • 26
    • 0026758501 scopus 로고
    • T.K.M. Shine, H.C. Tsui, and Z.H. Zhou Tetrahedron 48 1992 8659 Absolute configurations of these styryl groups are in accord with those of all suggested biogenetic precursors and allowed to propose the absolute configurations of related cytotoxic styryllactones and strucutures of potential biosynthetic intermediates not identified so far, see: Ref. 4q
    • (1992) Tetrahedron , vol.48 , pp. 8659
    • Shine, T.K.M.1    Tsui, H.C.2    Zhou, Z.H.3
  • 32
    • 31444450223 scopus 로고    scopus 로고
    • note
    • Similar carbohydrate-derived starting materials were also applied to the total synthesis of related styryllactones. For example, see: Ref. 4o. Direct treatment of 9 according to the following reaction sequence cited in Scheme 1 yielded only intractable materials at the final step of acetonide-deprotection.
  • 33
    • 31444435540 scopus 로고    scopus 로고
    • note
    • It is not necessarily to determine the absolute configuration at this anomer center, since the lactol function should be oxidized to the corresponding lactone at the final stage for the synthesis of 1.
  • 36
    • 31444456184 scopus 로고    scopus 로고
    • note
    • The absolute configuration of the newly created stereogenic center of 13b was easily characterized to be R after derivatization via the mesylate 19 to the corresponding cis-epoxide 20 as shown below.
  • 37
    • 0002793868 scopus 로고
    • b) was 4.38 Hz, which indicates the epoxide in 20 occupy the cis-relation;
    • b) was 4.38 Hz, which indicates the epoxide in 20 occupy the cis-relation; see: K. Tanaka, H. Horiuchi, and H. Yoda J. Org. Chem. 54 1989 63
    • (1989) J. Org. Chem. , vol.54 , pp. 63
    • Tanaka, K.1    Horiuchi, H.2    Yoda, H.3
  • 39
    • 31444454838 scopus 로고    scopus 로고
    • note
    • Compound 13a was also estimated to have the same configuration based on the similarity of its spectral data to those of 13b.
  • 40
    • 31444455495 scopus 로고    scopus 로고
    • note
    • When reduction of the labile hemiketal intermediate derived from 12b was carried out under slightly different conditions (change of the reduction temperature from -40 to -20°C), the reaction occurred with unsatisfactory stereoselectivity to give the mixture of the two diastereomers (13b : 14b = 86:14). It is consequently apparent that stereochemical outcome in these reactions strongly depends on the two factors; (a) steric bulkiness of the protecting groups in 12 and (b) reduction temperature of the hemiketal intermediates. These results can be explained that the reaction would proceed simply in terms of the thermodynamically more stable Cram's non-chelation transition structure.
  • 41
    • 31444432975 scopus 로고    scopus 로고
    • note
    • The absolute R-configuration of the generated stereogenic center was determined unambiguously based on its spectral data of synthetic (+)-1.
  • 42
    • 31444433841 scopus 로고    scopus 로고
    • note
    • 3-mediated six-membered metal-chelate structure due to the bottom-face shielding effect of the three large functional groups described below.
  • 43
    • 0030605868 scopus 로고    scopus 로고
    • The same type of transition metal halide-promoted six-membered chelating reactions have already been demonstrated in this laboratory with high stereoselectivity; see: H. Yoda, T. Nakajima, and K. Takabe Tetrahedron Lett. 37 1996 5531
    • (1996) Tetrahedron Lett. , vol.37 , pp. 5531
    • Yoda, H.1    Nakajima, T.2    Takabe, K.3


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.