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Volumn , Issue 9, 2008, Pages 1507-1509

Combined metalation-cross coupling strategies: A synthesis of schumanniophytine by a key biaryl O-carbamate remote anionic fries rearrangement

Author keywords

C C coupling; Directed remote metalation; Metalation; Total synthesis

Indexed keywords


EID: 53849146742     PISSN: 1434193X     EISSN: 10990690     Source Type: Journal    
DOI: 10.1002/ejoc.200701116     Document Type: Article
Times cited : (22)

References (40)
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    • The isolation, structural elucidation, and bioassays of schumanniophytine stimulated the synthesis of heterocycles containing combined chromone-pyridine systems, but studies of their bioactivities were apparently not pursued, see: O. H. Hishmat, N. M. A. El-Ebrashi, Sh. E. El-Naem, Synthesis 1982, 1075-1077.
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    • For the scope of such directed remote metalation (DreM) reactions in context of the synthetically useful and mechanistically interesting complex induced proximity effect (CIPE) concept, see: M. C. Whisler, S. MacNeil, V. Snieckus, P. Beak, Angew. Chem. Int. Ed. 2004, 43, 2206-2225.
    • For the scope of such directed remote metalation (DreM) reactions in context of the synthetically useful and mechanistically interesting complex induced proximity effect (CIPE) concept, see: M. C. Whisler, S. MacNeil, V. Snieckus, P. Beak, Angew. Chem. Int. Ed. 2004, 43, 2206-2225.
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    • For recent reviews on the DoM reaction and its connection to cross-coupling chemistry, see: a) T. Macklin, V. Snieckus in Handbook of C-H Transformations (Ed.: G. Dyker), Wiley-VCH, Weinheim, 2005, vol. 1, pp. 106-118;
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    • Handling and purification of this material proved difficult and was an unpleasant odiferous experience
    • Handling and purification of this material proved difficult and was an unpleasant odiferous experience.
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    • The hindrance is corroborated by the need to use -100°C temperatures for the TESCl reaction owing to its slower reactivity over TMSCl, which thus allowed the faster (intramolecular) anionic ortho-Fries rearrangement to occur, see ref.[8
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    • The migration was conveniently followed by React IR by observing the disappearance of the carbamoyl group (ν=1725 cm-1) and the appearance of the amide carbonyl group stretching frequencies (ν=1635 cm -1, the latter was only observed upon aqueous quench, which suggests the potential for trapping of the tetrahedral intermediate see Supporting Information
    • -1); the latter was only observed upon aqueous quench, which suggests the potential for trapping of the tetrahedral intermediate (see Supporting Information).
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.