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Volumn 69, Issue 11, 2004, Pages 3857-3865

Enantioselective total synthesis of (+)-brefeldin A and 7-epi-brefeldin A

Author keywords

[No Author keywords available]

Indexed keywords

ETHERS; REACTION KINETICS; REDUCTION; SOLUBILITY; SYNTHESIS (CHEMICAL); TITANIUM COMPOUNDS;

EID: 2442645214     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo049971d     Document Type: Article
Times cited : (45)

References (117)
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    • note
    • (a) We attempted to convert the acyl-thiazolidinethione 7b into the corresponding methyl ester or aldehyde as reported (ref 18b) by Crimmins. Testing the two conversions (using MeOH/imidazole or DIBAL-H to cleave the thiazolidinethione auxiliary) on 7b resulted in neither 33 (at low temperatures no reactions occurred, while at higher temperatures a complicated product mixture was obtained) nor 34 (extremely slow, with prolonged reaction/more forcing conditions leading to substantial amounts of diol 11), suggesting that the facile cleavage of the thiazolidinethione observed by Crimmins might be applicable only to those nonhindered acyl-thiazolidinethiones.
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    • (b) We tried (Scheme 8) to convert diol 11 into di-TBS ether 35 and further oxidize the primary TBS using QFC (quinolinium fluoro-chromate, cf.: Murugensan, V.; Pandurangan, A. Ind. J. Chem. 1992, 31 (B), 377) preferentially in the presence of a secondary one. Unfortunately again, we failed to obtain any 36.
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    • note
    • 42a and 42b (propane-1,3-dithol and bis-ethanethiol protected counterparts of 36) were synthesized from TBS ethers 40a/40b (derived from aldols 7c/7d) via alcohols 41a/41b. For structures and reaction details, see the Experimental Section in the Supporting Information.
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    • note
    • The stereogenic center at C-15 in this work was derived from a chiral epoxide of >99% ee (by chiral HPLC analysis) obtained by using Jacobsen HKR. For detailed information, see the Experimental Section, Part Two in the Supporting Information.
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    • note
    • The yield for introduction of the BFA lower chain via a Michael addition was usually in the range of 70-80%. See: (a) Reference 13 above (80%).
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    • See e.g.: (a) Reference 51
    • See e.g.: (a) Reference 51.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.