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Volumn 75, Issue 11, 2010, Pages 3831-3842

Ring-construction/stereoselective functionalization cascade: Total synthesis of pachastrissamine (Jaspine B) through palladium-catalyzed bis-cyclization of propargyl chlorides and carbonates

Author keywords

[No Author keywords available]

Indexed keywords

BENZAMIDES; BROMOALLENES; FUNCTIONALIZATIONS; FUNCTIONALIZED; LEAVING GROUPS; MARINE NATURAL PRODUCTS; PACHASTRISSAMINE (JASPINE B); PROPARGYL CHLORIDES; TETRA-HYDROFURAN; TOTAL SYNTHESIS;

EID: 77952967418     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo100544v     Document Type: Article
Times cited : (60)

References (126)
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    • Reaction of triflate 28 with 1.0 equiv of the allyl Grignard reagents gave the oxaazabicycloheptane 27 in 13% yield along with the recovery of the unchanged triflate 28 in 73% yield, without isolation of the intermediate 30. This is presumably due to a highly strained aminal structure of 30 and facile Grignard reaction to the iminium moiety of 31.
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    • 2 followed by initial intramolecular nucleophilic attack of a Boc group to the activated propargylic position would form bicyclic intermediate 40 through inversion of configuration. The second intermolecular nucleophilic attack of chloride anion via stereoinversion then gives syn-38.
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    • The relative configuration of syn-and anti-41 was determined by derivatization to the corresponding oxazolines or aziridines. The chloride syn-41 was subjected to NaH in DMF to give the oxazoline cis-42 (40) (7%) and aziridine cis-43 (41) (69%). In contrast, the reaction of anti-41 gave the oxazoline trans-42 (42) in 36% yield.
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    • The relative configuration of cis-42 was confirmed by comparison with the authentic sample prepared from the known alkynol syn-35. (23)
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    • The relative configuration of trans-42 was confirmed by comparison with the authentic sample prepared from the known alkynol anti-35. (23)
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    • The configuration of the bicyclic tetrahydrofuran 44 was determined by NOE analysis.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.