2-Methyl-1-pyrrolidinopentan-2-ol | 135285-87-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡咯烷类
• 英文名称: 2-Methyl-1-pyrrolidinopentan-2-ol
• 英文别名: 2-Methyl-1-pyrrolidino-pentan-2-ol；2-methyl-1-pyrrolidin-1-ylpentan-2-ol
• CAS: 135285-87-9
• 化学式: C₁₀H₂₁NO
• 分子量: 171.283
• InChiKey: DKZDVBXTQJVPKA-UHFFFAOYSA-N

物化性质

• 沸点：
  251.2±13.0 °C(Predicted)
• 密度：
  0.946±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  12
• 可旋转键数：
  4
• 环数：
  1.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  23.5
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  2-甲基-1-吡咯烷-1-戊烯 生成 2-Methyl-1-pyrrolidinopentan-2-ol
  参考文献：
  名称：

  Unusual directive effects in the hydroboration of .beta.,.beta.-disubstituted enamines. Conversion of .alpha.-substituted aldehydes to the corresponding alkenes and .beta.-amino alcohols

  摘要：

  A comprehensive study of the conversion of beta,beta-disubstituted enamines into the corresponding alkenes and beta-amino alcohols by hydroboration-elimination and hydroboration-oxidation, respectively, has been carried out. The amine moiety of beta,beta-disubstituted enamines was found to exert a decisive influence on the regioselectivity of the hydroboration reaction involving borane methyl sulfide (BMS). Thus, in the hydroboration of morpholino and piperidino enamines, the boron atom is initially placed predominantly in the alpha-position. Conversely, the pyrrolidino enamines direct the boron atom exclusively to the beta-position. Three oxidizing agents, trimethylamine N-oxide, sodium perborate, and 30% hydrogen peroxide-solid sodium hydroxide, were tried in order to optimize the oxidation of the intermediate organoborane derivatives to the corresponding amino alcohols. Our results clearly indicated that 30% hydrogen peroxide-solid sodium hydroxide is best suited for this transformation. The yield of amino alcohol ranged from good to essentially quantitative. Enamines derived from beta-aryl aldehydes, upon hydroboration with BMS followed by methanolysis and oxidation with neutral hydrogen peroxide, gave the corresponding 1,1-disubstituted alkenes. Contrary to the regioselectivity observed in the hydroboration reactions involving BMS, the hydroboration of beta,beta-disubstituted enamines using 9-borabicyclo[3.3.1]nonane (9-BBN) gave the trialkylborane intermediates in which the boron atom was placed exclusively at the beta-position regardless of the amine moiety of the enamine. These trialkylborane derivatives were very stable and did not undergo the usual elimination reaction with either methanol or sodium hydroxide. However, on thermal decomposition, these afforded the corresponding 1,1-disubstituted alkenes in high yields.

  DOI：

  10.1021/jo00019a043