Dimethyl (2E,6E)-2-Methyl-2,6-octadienedioate | 141045-81-0

• 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: Dimethyl (2E,6E)-2-Methyl-2,6-octadienedioate
• 英文别名: dimethyl (2E,6E)-2-methylocta-2,6-dienedioate
• CAS: 141045-81-0
• 化学式: C₁₁H₁₆O₄
• 分子量: 212.246
• InChiKey: OPFLLPJYROJVRP-CDJQDVQCSA-N

物化性质

• 沸点：
  299.9±40.0 °C(Predicted)
• 密度：
  1.039±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  15
• 可旋转键数：
  7
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.45
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  Dimethyl (2E,6E)-2-Methyl-2,6-octadienedioate 在 盐酸 、 manganese(IV) oxide 、 lithium aluminium tetrahydride 、 silica gel 、 potassium carbonate 作用下， 以 甲醇 、 乙醚 、 氯仿 、 xylene 为溶剂， 反应 38.25h， 生成 (4S*,4aS*)-4-Methyl-4,4a,5,6-tetrahydrocyclopentapyran-1(3H)-one
  参考文献：
  名称：

  New type of cyclization of .alpha.,.beta.,.chi.,.psi.-unsaturated dioic acid esters through tandem conjugate additions by using lithium N-benzyl-N-(trimethylsilyl)amide as a nitrogen nucleophile

  摘要：

  Treatment of dimethyl (2E,6E)-2,6-octadienedioate with lithium N-benzyl-N-(trimethylsilyl)amide (LSA) gave 5-exo-trig ring closure products, methyl 3-(N-benzylamino)-2-(methoxycarbonyl)cyclopentane-1-acetates, through tandem conjugate additions. The related 6-exo-trig cyclization proceeded stereoselectively to give ethyl c-3-(N-benzylamino)-t-2-(ethoxycarbonyl)cyclohexane-1-acetate. In contrast with the 5- and 6-exo-trig cyclization, no 7-exo-trig cyclization occurred. The 5-exo-trig cyclization products were converted into 2-(methoxycarbonyl)-2-cyclopentene-1-carboxylic acid methyl ester in an excellent yield. 5-exo-trig cyclization of the unsymmetrical dienedioate consisting of crotonate and (E)-2-methyl-2-butenoate units proceeded regioselectively through conjugate addition of LSA to the crotonate part. Similar regioselectively was observed in the case of 5-exo-trig cyclization of the dienedioate possessing crotonate and (E)-3-methyl-2-pentenoate units. Total syntheses of the physiologically active cyclopentane monoterpenes (+/-)-dihydronepetalactone and (+/-)-isohydronepetalactone has been accomplished by this cyclization strategy. In addition, it has been demonstrated that LSA is a more efficient nitrogen nucleophile than LDA to cyclize omega-halo-alpha,beta-unsaturated esters.

  DOI：

  10.1021/jo00037a034
• 作为产物：
  描述：

  三甲基膦酰基乙酸酯 、 Methyl 2-Methyl-6-oxo-2-hexenoate 在 sodium hydride 作用下， 生成 Dimethyl (2E,6E)-2-Methyl-2,6-octadienedioate
  参考文献：
  名称：

  New type of cyclization of .alpha.,.beta.,.chi.,.psi.-unsaturated dioic acid esters through tandem conjugate additions by using lithium N-benzyl-N-(trimethylsilyl)amide as a nitrogen nucleophile

  摘要：

  Treatment of dimethyl (2E,6E)-2,6-octadienedioate with lithium N-benzyl-N-(trimethylsilyl)amide (LSA) gave 5-exo-trig ring closure products, methyl 3-(N-benzylamino)-2-(methoxycarbonyl)cyclopentane-1-acetates, through tandem conjugate additions. The related 6-exo-trig cyclization proceeded stereoselectively to give ethyl c-3-(N-benzylamino)-t-2-(ethoxycarbonyl)cyclohexane-1-acetate. In contrast with the 5- and 6-exo-trig cyclization, no 7-exo-trig cyclization occurred. The 5-exo-trig cyclization products were converted into 2-(methoxycarbonyl)-2-cyclopentene-1-carboxylic acid methyl ester in an excellent yield. 5-exo-trig cyclization of the unsymmetrical dienedioate consisting of crotonate and (E)-2-methyl-2-butenoate units proceeded regioselectively through conjugate addition of LSA to the crotonate part. Similar regioselectively was observed in the case of 5-exo-trig cyclization of the dienedioate possessing crotonate and (E)-3-methyl-2-pentenoate units. Total syntheses of the physiologically active cyclopentane monoterpenes (+/-)-dihydronepetalactone and (+/-)-isohydronepetalactone has been accomplished by this cyclization strategy. In addition, it has been demonstrated that LSA is a more efficient nitrogen nucleophile than LDA to cyclize omega-halo-alpha,beta-unsaturated esters.

  DOI：

  10.1021/jo00037a034

文献信息

• Coupling reactions of vinylketene silyl acetals promoted by titanium tetrachloride
  作者：Kenji Hirai、Iwao Ojima

  DOI：10.1016/s0040-4039(00)81527-0

  日期：1983.1

  Homo- and cross-couplings of vinylketene silyl acetals were found to be effectively promoted by titanium tetrachloride to give the corresponding unsaturated diesters in good yields. The reactions between two different ketene silyl acetate afforded the corresponding cross-coupling products in unexpectedly good selectivities.

  发现四氯化钛可有效地促进乙烯酮甲硅烷基乙缩醛的均相和交叉偶联，从而以良好的收率得到相应的不饱和二酯。两种不同的乙烯酮乙酸乙烯酯之间的反应以出乎意料的良好选择性提供了相应的交叉偶联产物。
• HIRAI, KENJI;OJIMA, IWAO, TETRAHEDRON LETT., 1983, 24, N 8, 785-788
  作者：HIRAI, KENJI、OJIMA, IWAO

  DOI：——

  日期：——