ethyl (2S)-2-<(tert-butyldiphenylsilyl)oxy>-3-methylbutanoate | 173425-03-1

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: ethyl (2S)-2-<(tert-butyldiphenylsilyl)oxy>-3-methylbutanoate
• 英文别名: ethyl (2S)-2-[tert-butyl(diphenyl)silyl]oxy-3-methylbutanoate
• CAS: 173425-03-1
• 化学式: C₂₃H₃₂O₃Si
• 分子量: 384.591
• InChiKey: HLMIUCZNNDGUKX-NRFANRHFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.15
• 重原子数：
  27
• 可旋转键数：
  9
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  ethyl (2S)-2-<(tert-butyldiphenylsilyl)oxy>-3-methylbutanoate 在 二异丁基氢化铝 作用下， 以 乙醚 、 正己烷 为溶剂， 反应 6.0h， 以97%的产率得到(2S)-2-<(tert-butyldiphenylsilyl)oxy>-3-methylbutanal
  参考文献：
  名称：

  Enantioselective Total Synthesis of the Macrocyclic Spermidine Alkaloid (−)-Oncinotine

  摘要：

  The macrocyclic spermidine alkaloid (-)-oncinotine (1), isolated from Oncinotis nitida (Apocynaceae), was synthesized enantioselectively for the first time based on intramolecular iminium ion cyclization utilizing enantiomerically pure (2S)-N-[(benzyloxy)carbonyl]-2-piperidineacetaldehyde (8) as a chiral starting material. The required 8 was derived from the erythro adduct 16, which was obtained by diastereoselective 1,3-dipolar cycloaddition between 2,3,4,5-tetrahydropyridine 1-oxide (4) and (3S)-3-[(tert-butyldiphenylsilyl)oxy]-4-methyl-1-pentene (15). Wittig condensation of 8 with [8-(methoxycarbonyl)octyl]triphenylphosphonium iodide (21) followed by saponification provided the chiral piperidine moiety 23, which was coupled with the N-propyl-1,4-butanediamine segment 29 by using diethoxyphosphoryl cyanide in the presence of triethylamine to afford the tertiary amide 30. Conversion of 30 to the aldehyde 34 via desilylation and Swern oxidation, followed by hydrogenation over a palladium hydroxide catalyst under high dilution led to in situ formation of the transient iminium ion 35, which was further hydrogenated to form 33 in a single operation. Subsequent removal of the Boc protecting group resulted in (-)-oncinotine (1).

  DOI：

  10.1021/jo9518258
• 作为产物：
  描述：

  ethyl (2S)-2-hydroxy-3-methylbutanoate 、 叔丁基二苯基氯硅烷 在 咪唑 作用下， 以 N,N-二甲基甲酰胺 为溶剂， 反应 7.0h， 以92%的产率得到ethyl (2S)-2-<(tert-butyldiphenylsilyl)oxy>-3-methylbutanoate
  参考文献：
  名称：

  Enantioselective Total Synthesis of the Macrocyclic Spermidine Alkaloid (−)-Oncinotine

  摘要：

  The macrocyclic spermidine alkaloid (-)-oncinotine (1), isolated from Oncinotis nitida (Apocynaceae), was synthesized enantioselectively for the first time based on intramolecular iminium ion cyclization utilizing enantiomerically pure (2S)-N-[(benzyloxy)carbonyl]-2-piperidineacetaldehyde (8) as a chiral starting material. The required 8 was derived from the erythro adduct 16, which was obtained by diastereoselective 1,3-dipolar cycloaddition between 2,3,4,5-tetrahydropyridine 1-oxide (4) and (3S)-3-[(tert-butyldiphenylsilyl)oxy]-4-methyl-1-pentene (15). Wittig condensation of 8 with [8-(methoxycarbonyl)octyl]triphenylphosphonium iodide (21) followed by saponification provided the chiral piperidine moiety 23, which was coupled with the N-propyl-1,4-butanediamine segment 29 by using diethoxyphosphoryl cyanide in the presence of triethylamine to afford the tertiary amide 30. Conversion of 30 to the aldehyde 34 via desilylation and Swern oxidation, followed by hydrogenation over a palladium hydroxide catalyst under high dilution led to in situ formation of the transient iminium ion 35, which was further hydrogenated to form 33 in a single operation. Subsequent removal of the Boc protecting group resulted in (-)-oncinotine (1).

  DOI：

  10.1021/jo9518258

文献信息

• Enantioselective Total Synthesis of the Macrocyclic Spermidine Alkaloid (−)-Oncinotine
  作者：Hiroji Ina、Masayuki Ito、Chihiro Kibayashi

  DOI：10.1021/jo9518258

  日期：1996.1.1

  The macrocyclic spermidine alkaloid (-)-oncinotine (1), isolated from Oncinotis nitida (Apocynaceae), was synthesized enantioselectively for the first time based on intramolecular iminium ion cyclization utilizing enantiomerically pure (2S)-N-[(benzyloxy)carbonyl]-2-piperidineacetaldehyde (8) as a chiral starting material. The required 8 was derived from the erythro adduct 16, which was obtained by diastereoselective 1,3-dipolar cycloaddition between 2,3,4,5-tetrahydropyridine 1-oxide (4) and (3S)-3-[(tert-butyldiphenylsilyl)oxy]-4-methyl-1-pentene (15). Wittig condensation of 8 with [8-(methoxycarbonyl)octyl]triphenylphosphonium iodide (21) followed by saponification provided the chiral piperidine moiety 23, which was coupled with the N-propyl-1,4-butanediamine segment 29 by using diethoxyphosphoryl cyanide in the presence of triethylamine to afford the tertiary amide 30. Conversion of 30 to the aldehyde 34 via desilylation and Swern oxidation, followed by hydrogenation over a palladium hydroxide catalyst under high dilution led to in situ formation of the transient iminium ion 35, which was further hydrogenated to form 33 in a single operation. Subsequent removal of the Boc protecting group resulted in (-)-oncinotine (1).