Synthesis of methylpyridine derivative. XXXI. Reaction of acetoacetamide with .ALPHA.,.BETA.-unsaturated ketones and aldehydes.
作者:TETSUZO KATO、MASAKI NODA
DOI:10.1248/cpb.23.2193
日期:——
Reaction of Acetoacetamide (I) with α, β-unsaturated ketone (II) and aldehyde (XV) is described. Reaction of I with 3-buten-2-one (IIa) gives rise to 3-carbamoyl-2, 6-heptanedione (IIIa), 2-carbamoyl-5-hydroxy-5-methylcyclohexanone (IVa), 6-carbamoyl-3-methyl-2-cyclohexanone (Va), 3-acetyl-6-methyl-3, 4-dihydro-2 (1H)-pyridone (VIa), and 3, 9-dimethyl-2-azaspiro [5, 5] undeca-3, 8-diene-1, 7-dione (VII). Reaction conditions such as catalyst and reaction temperature influence the product formed. Similarly, reactions of I with 3-penten-2-one (IIb), 4-methyl-3-penten-2-one (IIc), 4-phenyl-3-buten-2-one (IId), and 2-benzylideneacetophenone (IIe) afford the corresponding cyclohexanone derivatives (Vb, c, d, e) besides the dihydropyridone derivatives (VIb, d, e). α, β-Unsaturated aldehyde such as crotonaldehyde (XVa) reacts with I to give 3-acetyl-6-hydroxy-4-methyl-2-piperidone (XVIa), 3-acetyl-4-methyl-3, 4-dihydro-2 (1H)-pyridone (XVIIa), and 3-acetyl-6-ethoxy-4-methyl-2-piperidone (XVIIa). Similar reaction of cinnamaldehyde (XVb) with I gives rise to the adduct (XVIb), dihydropyridone derivative (XVIIb), and piperidone derivative (XVIIIb).
描述了乙酰乙酰胺(I)与α,β-不饱和酮(II)和醛(XV)的反应。 I 与 3-丁烯-2-酮 (IIa) 反应生成 3-氨基甲酰基-2, 6-庚二酮 (IIIa), 2-氨基甲酰基-5-羟基-5-甲基环己酮 (IVa), 6-氨基甲酰基-3 -甲基-2-环己酮 (Va)、3-乙酰基-6-甲基-3, 4-二氢-2 (1H)-吡啶酮 (VIa) 和 3, 9-二甲基-2-氮杂螺[5, 5]十一碳-3, 8-二烯-1, 7-二酮(VII)。催化剂和反应温度等反应条件影响形成的产物。类似地,I与3-戊烯-2-酮(IIb)、4-甲基-3-戊烯-2-酮(IIc)、4-苯基-3-丁烯-2-酮(IId)和2-的反应亚苄基苯乙酮(IIe)除了二氢吡啶酮衍生物(VIb、d、e)之外还提供相应的环己酮衍生物(Vb、c、d、e)。 α,β-不饱和醛如巴豆醛(XVa)与I反应得到3-乙酰基-6-羟基-4-甲基-2-哌啶酮(XVIa),3-乙酰基-4-甲基-3,4-二氢- 2(1H)-吡啶酮(XVIIa)和3-乙酰基-6-乙氧基-4-甲基-2-哌啶酮(XVIIa)。肉桂醛(XVb)与I的类似反应产生加合物(XVIb)、二氢吡啶酮衍生物(XVIIb)和哌啶酮衍生物(XVIIIb)。