The Intramolecular Heck Reaction and the Synthesis of Indolizidinone, Quinolizidinone and Benzoazepinone Derivatives
作者:Ronaldo Pilli、Leonardo Santos
DOI:10.1055/s-2002-19293
日期:——
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 ben- zoazepinones (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
N-烯丙基-、-芳基-或-苄基-5-烯丙基-2-吡咯烷酮和N-烯丙基-、-芳基-或-苄基-6-烯丙基-2-哌啶酮(1a f)的分子内Heck环化,制备通过烯丙基三甲基硅烷加成相应的环状 N-acyliminium 离子,以中等至良好的产率(56 90% )。在所研究的所有实施例中都观察到了独家的外三键环化模式,并且伴随着双键迁移,这排除了我们与亲二烯体(如马来酸酐、甲基乙烯基)的一锅串联 Diels-Alder 环加成的尝试酮和偶氮二甲酸二乙酯。2:1 区域异构吲哚茚酮 5a-5b 混合物的催化加氢得到立体异构富集的顺式吲哚茚酮 6a (20: 1 混合物)的定量产率。在区域异构苯并氮杂酮 7b-8b 的催化氢化中观察到类似的行为。