Chemo- and Regioselective Isomerization of Epoxides to Carbonyl Compounds via Palladium Catalysis
摘要:
Palladium(O)-tertiary phosphine complexes catalyze the chemo- and regioselective isomerization of epoxides to carbonyl compounds in good to excellent yields; alkyl-substituted epoxides afford methyl ketones, and aryl-substituted epoxides form aldehydes or ketones via cleavage of the benzylic C-O bond.
Oxidation of Cyclopropylamines and Aziridines with Lead Tetraacetate
作者:Tamejiro Hiyama、Hiroshi Koide、Hitosi Nozaki
DOI:10.1246/bcsj.48.2918
日期:1975.10
the only isolable product. These reactions are explained by assuming the common intermediacy of nitrenium ions such as (Remark: Graphics omitted.) respectively. The assumption is confirmed by the oxidation of the corresponding amines with sodium hypochlorite. Entention of the reaction to 2,3-polymethyleneaziridines with R group on C-2 afforded R–CO–(CH2)n–C≡N type products (R=H, alkyl, phenyl) in preparative
2-苯基环丙胺的标题反应生成肉桂醛,而1-苯基异构体的标题反应生成苄腈和乙烯。2-苯基氮丙啶的类似处理提供苯甲醛作为唯一的可分离产物。这些反应分别通过假设氮鎓离子的共同中间体(例如(备注:省略图形))来解释。相应的胺用次氯酸钠氧化证实了该假设。C-2 上带有 R 基团的 2,3-聚亚甲基氮丙啶反应以制备产率提供 R-CO-(CH2)n-C≡N 型产物(R=H,烷基,苯基)。这提供了一种新的环烯烃 C=C 键断裂方法。