(Z)-5-<<(1,1-Dimethylethyl)dimethylsilyl>oxy>-2,3-dimethyl-2-pentenoic acid methyl ester | 162292-99-1

• 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: (Z)-5-<<(1,1-Dimethylethyl)dimethylsilyl>oxy>-2,3-dimethyl-2-pentenoic acid methyl ester
• 英文别名: methyl (Z)-5-[tert-butyl(dimethyl)silyl]oxy-2,3-dimethylpent-2-enoate
• CAS: 162292-99-1
• 化学式: C₁₄H₂₈O₃Si
• 分子量: 272.46
• InChiKey: VZHKNIPMBZTOGW-QXMHVHEDSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.91
• 重原子数：
  18
• 可旋转键数：
  7
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.79
• 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：

  (Z)-5-<<(1,1-Dimethylethyl)dimethylsilyl>oxy>-2,3-dimethyl-2-pentenoic acid methyl ester 在 manganese(IV) oxide 、 lithium aluminium tetrahydride 、 正丁基锂 、 三苯基甲烷 作用下， 以 四氢呋喃 、 正己烷 、 二氯甲烷 为溶剂， 反应 25.25h， 生成 (Z)-7-[tert-butyl(dimethyl)silyl]oxy-4,5-dimethylhept-4-en-1-yn-3-ol
  参考文献：
  名称：

  Enynones in Organic Synthesis. 7. Substituent Effects on the .alpha.-Tocopherol-Catalyzed Cyclization of Enynones to Methylenecyclopentenones. Convenient Syntheses of Members of the Methylenomycin Class of Antibiotics

  摘要：

  Substituent effects on the a-tocopherol (vitamin E, 3b) catalyzed cyclization of a wide variety of enynones 1a-z to methylenecyclopentenones 7a-z have been examined, with particular emphasis given to electron-withdrawing and -donating groups at positions 2-4 and 6. In general, electron-withdrawing groups at positions 4 and 6 dramatically accelerate the cyclization process, while strong electron-donating groups at positions 3 and 4 completely inhibit reaction. Relatively little effect is exerted by groups at C-2, except for the methyl ester derivative 1i, which is totally unreactive. This methodology was employed in the syntheses of the methylenecyclopentenone antibiotics methylenomycin B (7a) and desepoxy-4,5-didehydromethylenomycin A (7z) and in formal syntheses of methylenomycin A (8) and xanthocidin (9).

  DOI：

  10.1021/jo00097a036
• 作为产物：
  描述：

  3,4-dimethyl-5,6-dihydro-2H-pyran-2-one 在 4-二甲氨基吡啶 、 氢氧化钾 、 三乙胺 作用下， 以 二氯甲烷 为溶剂， 反应 27.17h， 生成 (Z)-5-<<(1,1-Dimethylethyl)dimethylsilyl>oxy>-2,3-dimethyl-2-pentenoic acid methyl ester
  参考文献：
  名称：

  Enynones in Organic Synthesis. 7. Substituent Effects on the .alpha.-Tocopherol-Catalyzed Cyclization of Enynones to Methylenecyclopentenones. Convenient Syntheses of Members of the Methylenomycin Class of Antibiotics

  摘要：

  Substituent effects on the a-tocopherol (vitamin E, 3b) catalyzed cyclization of a wide variety of enynones 1a-z to methylenecyclopentenones 7a-z have been examined, with particular emphasis given to electron-withdrawing and -donating groups at positions 2-4 and 6. In general, electron-withdrawing groups at positions 4 and 6 dramatically accelerate the cyclization process, while strong electron-donating groups at positions 3 and 4 completely inhibit reaction. Relatively little effect is exerted by groups at C-2, except for the methyl ester derivative 1i, which is totally unreactive. This methodology was employed in the syntheses of the methylenecyclopentenone antibiotics methylenomycin B (7a) and desepoxy-4,5-didehydromethylenomycin A (7z) and in formal syntheses of methylenomycin A (8) and xanthocidin (9).

  DOI：

  10.1021/jo00097a036

文献信息

• Enynones in Organic Synthesis. 7. Substituent Effects on the .alpha.-Tocopherol-Catalyzed Cyclization of Enynones to Methylenecyclopentenones. Convenient Syntheses of Members of the Methylenomycin Class of Antibiotics
  作者：Peter A. Jacobi、Harry L. Brielmann、Reginald O. Cann

  DOI：10.1021/jo00097a036

  日期：1994.9

  Substituent effects on the a-tocopherol (vitamin E, 3b) catalyzed cyclization of a wide variety of enynones 1a-z to methylenecyclopentenones 7a-z have been examined, with particular emphasis given to electron-withdrawing and -donating groups at positions 2-4 and 6. In general, electron-withdrawing groups at positions 4 and 6 dramatically accelerate the cyclization process, while strong electron-donating groups at positions 3 and 4 completely inhibit reaction. Relatively little effect is exerted by groups at C-2, except for the methyl ester derivative 1i, which is totally unreactive. This methodology was employed in the syntheses of the methylenecyclopentenone antibiotics methylenomycin B (7a) and desepoxy-4,5-didehydromethylenomycin A (7z) and in formal syntheses of methylenomycin A (8) and xanthocidin (9).