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DOI: 10.1055/s-2002-19293
The Intramolecular Heck Reaction and the Synthesis of Indolizidinone, Quinolizidinone and Benzoazepinone Derivatives
Publikationsverlauf
Publikationsdatum:
04. August 2004 (online)
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Abstract
The intramolecular Heck cyclization of N-allyl-, -aryl- or -benzyl-5-allyl-2-pyrrolidinones and N-allyl-, -aryl- or -benzyl-6-allyl-2-piperidinones (1a-f), prepared through allyltrimethylsilane addition to the corresponding cyclic N-acyliminium ions, afforded indolizidinones (3a, 5a, 5b), quinolizidinones (3b, 4b) and benzoazepinones (7a, 8a, 7b, 8b) in moderate to good yields (56-90%). Exclusive exo-trig over endo-trig mode of cyclization was observed in all examples investigated, and it was accompanied by double bond migration, which precluded our attempts of a one-pot tandem Diels-Alder cycloaddition with dienophiles such as maleic anhydride, methyl vinyl ketone and diethyl azodicarboxylate. Catalytic hydrogenation of a 2:1 mixture of regioisomeric indolizidinones 5a-5b afforded the stereoisomerically enriched cis indolizidinone 6a (20:1 mixture) in quantitative yield. A similar behavior was observed in the catalytic hydrogenation of regioisomeric benzoazepinones 7b-8b.
Key words
Heck reaction - intramolecular cylization - hydrogenation
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