Acetic acid (1R,2R,3S)-2-acetoxy-1-[(S)-1-((1R,3aS,3bS,6aS,8S,9R,10aR,10bS,12aS)-8-hydroxy-9-methoxy-10a,12a-dimethyl-6-oxo-hexadecahydro-5-oxa-benzo[3,4]cyclohepta[1,2-e]inden-1-yl)-ethyl]-3,4-dimethyl-pentyl ester | 445262-54-4

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 异戊烯醇脂质
• 英文名称: Acetic acid (1R,2R,3S)-2-acetoxy-1-[(S)-1-((1R,3aS,3bS,6aS,8S,9R,10aR,10bS,12aS)-8-hydroxy-9-methoxy-10a,12a-dimethyl-6-oxo-hexadecahydro-5-oxa-benzo[3,4]cyclohepta[1,2-e]inden-1-yl)-ethyl]-3,4-dimethyl-pentyl ester
• 英文别名: [(2S,3R,4R,5S)-4-acetyloxy-2-[(1S,2R,4R,5S,7S,11S,12S,15R,16S)-5-hydroxy-4-methoxy-2,16-dimethyl-8-oxo-9-oxatetracyclo[9.7.0.02,7.012,16]octadecan-15-yl]-5,6-dimethylheptan-3-yl] acetate
• CAS: 445262-54-4
• 化学式: C₃₃H₅₄O₈
• 分子量: 578.787
• InChiKey: GEXAWPHTMGVFOJ-BVWVPLFXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.19
• 重原子数：
  41.0
• 可旋转键数：
  8.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.91
• 拓扑面积：
  108.36
• 氢给体数：
  1.0
• 氢受体数：
  8.0

反应信息

• 作为反应物：
  描述：

  Acetic acid (1R,2R,3S)-2-acetoxy-1-[(S)-1-((1R,3aS,3bS,6aS,8S,9R,10aR,10bS,12aS)-8-hydroxy-9-methoxy-10a,12a-dimethyl-6-oxo-hexadecahydro-5-oxa-benzo[3,4]cyclohepta[1,2-e]inden-1-yl)-ethyl]-3,4-dimethyl-pentyl ester 在 sodium hydroxide 作用下， 以 甲醇 、 水 为溶剂， 反应 1.0h， 以66%的产率得到2-O-methylbrassinolide
  参考文献：
  名称：

  Synthesis and bioactivity of C-2 and C-3 methyl ether derivatives of brassinolide

  摘要：

  The following six novel methyl ether derivatives of brassinolide were prepared and their brassinosteroid activity was measured by means of the rice leaf lamina inclination bioassay: 2-O-methylbrassinolide, 3-o-methylbrassinolide, 2.22,23-tri-O-methyl-brassinolide, 3,22,23-tri-O-methylbrassinolide, 2-O-methyl-25-methoxybrassinolide and 3-O-methyl-25-methox-brassinolide. Brassinolide was used as a standard for comparison. All six compounds were also tested in the presence of 1000 ng of indole-3-acetic acid (IAA), an auxin that synergizes the effects of brassinosteroids. The 2-O-methyl- and 3-O-methylbrassinolide derivatives showed weak activity at high doses, which was enhanced by IAA, especially in the case of the 3-0-methyl derivative. Similarly, the 2,22,23tri-O-methyl- and 3,22,23-tri-O-methyl derivatives displayed weak bioactivity on their own, but significantly stronger activity when applied with IAA. The 3-O-methyl and 3,22,23-tri-O-methyl analogues plus lAA were comparable in bioacivity to brassinolide alone, but were less active than brassinolide plus IAA. In each case, O-methylation at C-2 resulted in a greater loss of activity than O-methylation at C-3 Linder the same conditions. The relatively strong activity of 3,22,23-tri-O-methylbrassinolide in the presence of IAA is especially noteworthy as it indicates that free hydroxyl groups at C-3, C-22, and C-23 are not essential for bioactivity. Finally, 2-O-methyl- and 3-O-methyl-25-methoxybrassinolide were essentially inactive alone, and showed only a modest increase in bioactivity when coapplied with IAA. (C) 2002 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0031-9422(02)00019-5
• 作为产物：
  描述：

  (2S,3R,4R,5S)-5,6-dimethyl-2-[(1'S,2'R,4'R,8'S,13'S,14'S,17'R,18'S)-2',6',6',18'-tetramethylspiro[1,3-dioxolane-2,11'-5,7-dioxapentacyclo[11.7.0.02,10.04,8.014,18]icosane]-17'-yl]heptane-3,4-diol 在 吡啶 、 4-二甲氨基吡啶 、 三氟乙酸 、 tin(ll) chloride 作用下， 以 乙醚 、 二氯甲烷 、 氯仿 为溶剂， 反应 25.67h， 生成 Acetic acid (1R,2R,3S)-2-acetoxy-1-[(S)-1-((1R,3aS,3bS,6aS,8S,9R,10aR,10bS,12aS)-8-hydroxy-9-methoxy-10a,12a-dimethyl-6-oxo-hexadecahydro-5-oxa-benzo[3,4]cyclohepta[1,2-e]inden-1-yl)-ethyl]-3,4-dimethyl-pentyl ester
  参考文献：
  名称：

  Synthesis and bioactivity of C-2 and C-3 methyl ether derivatives of brassinolide

  摘要：

  The following six novel methyl ether derivatives of brassinolide were prepared and their brassinosteroid activity was measured by means of the rice leaf lamina inclination bioassay: 2-O-methylbrassinolide, 3-o-methylbrassinolide, 2.22,23-tri-O-methyl-brassinolide, 3,22,23-tri-O-methylbrassinolide, 2-O-methyl-25-methoxybrassinolide and 3-O-methyl-25-methox-brassinolide. Brassinolide was used as a standard for comparison. All six compounds were also tested in the presence of 1000 ng of indole-3-acetic acid (IAA), an auxin that synergizes the effects of brassinosteroids. The 2-O-methyl- and 3-O-methylbrassinolide derivatives showed weak activity at high doses, which was enhanced by IAA, especially in the case of the 3-0-methyl derivative. Similarly, the 2,22,23tri-O-methyl- and 3,22,23-tri-O-methyl derivatives displayed weak bioactivity on their own, but significantly stronger activity when applied with IAA. The 3-O-methyl and 3,22,23-tri-O-methyl analogues plus lAA were comparable in bioacivity to brassinolide alone, but were less active than brassinolide plus IAA. In each case, O-methylation at C-2 resulted in a greater loss of activity than O-methylation at C-3 Linder the same conditions. The relatively strong activity of 3,22,23-tri-O-methylbrassinolide in the presence of IAA is especially noteworthy as it indicates that free hydroxyl groups at C-3, C-22, and C-23 are not essential for bioactivity. Finally, 2-O-methyl- and 3-O-methyl-25-methoxybrassinolide were essentially inactive alone, and showed only a modest increase in bioactivity when coapplied with IAA. (C) 2002 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0031-9422(02)00019-5