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Volumn 131, Issue 32, 2009, Pages 11402-11406

Regiospecific and stereoselective syntheses of (±) morphine, codeine, and thebaine via a highly stereocontrolled intramolecular 4 + 2 cycloaddition leading to a phenanthrofuran system

Author keywords

[No Author keywords available]

Indexed keywords

[4 + 2] CYCLOADDITION; REGIOSPECIFIC; STEREOSELECTIVE FORMATION; STEREOSELECTIVE SYNTHESIS; TOTAL SYNTHESIS;

EID: 68949112541     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja9038505     Document Type: Article
Times cited : (73)

References (73)
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    • For several excellent recent reviews related to morphine biological action, biogenesis, total syntheses, and various approaches, see, inter alia
    • For several excellent recent reviews related to morphine (biological action, biogenesis, total syntheses, and various approaches, see, inter alia: Blakemore, P. R.; White, J. D. Chem. Commun. 2002, 1159-1168.
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    • The star performers in the team of molecular acrobats are undoubtedly the alkaloids of the morphine group. Robinson, R. Proc. R. Soc. London 1947, B135, xiv.
    • "The star performers in the team of molecular acrobats are undoubtedly the alkaloids of the morphine group." Robinson, R. Proc. R. Soc. London 1947, B135, xiv.
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    • Experimental details of the synthesis of 1,3-pentadienecarbinol 5 from the benzofurancarboxaldehyde 10 are described in the Supporting Information, as is the X-ray of the acetate of Diels-Alder adduct 6. That X-ray showed that selective formation of a specific diastereomer of the secondary hydroxyl in ring B of 6 had taken place. This is potentially useful because, even though that hydroxyl would have to be removed at some future point, it means that one could select the correct enantiomer of starting carbinol 5 to produce either enantiomer of the synthetic alkaloid. We did not take advantage of that possibility because enantioinduction was not a goal of our work. The synthetic substances synthesized in this work are racemic: the structural drawings in this work indicate their relative stereochemistry
    • Experimental details of the synthesis of 1,3-pentadienecarbinol 5 from the benzofurancarboxaldehyde 10 are described in the Supporting Information, as is the X-ray of the acetate of Diels-Alder adduct 6. That X-ray showed that selective formation of a specific diastereomer of the secondary hydroxyl in ring B of 6 had taken place. This is potentially useful because, even though that hydroxyl would have to be removed at some future point, it means that one could select the correct enantiomer of starting carbinol 5 to produce either enantiomer of the synthetic alkaloid. We did not take advantage of that possibility because enantioinduction was not a goal of our work. The synthetic substances synthesized in this work are racemic: the structural drawings in this work indicate their relative stereochemistry.
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    • Actually, because the enol ether system precursor of the acetaldehyde chain is itself an (operationally irrelevant) E/Z mixture, convergence to a single ketone was cleanly observable only after hydrolysis of enol ether 17 to the related aldehyde.
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    • As described in the Supporting Information, the 61% yield in that oxidation with tert-butyl hydroperoxide/selenium dioxide in methylene dichloride was obtained only in the presence of a small amount of water. The observed regiochemistry may reflect the smaller structural distortion required for that transition state over the alternative. See also ref 1v.
    • As described in the Supporting Information, the 61% yield in that oxidation with tert-butyl hydroperoxide/selenium dioxide in methylene dichloride was obtained only in the presence of a small amount of water. The observed regiochemistry may reflect the smaller structural distortion required for that transition state over the alternative. See also ref 1v.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.