(20R)-达马-24-烯-3beta,20-二醇 | 14351-28-1

• 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
• 中文名称: (20R)-达马-24-烯-3beta,20-二醇
• 英文名称: (20R)-dammarenediol
• 英文别名: dammarenediol I；8-methyl-18-nor-20β_FH-lanost-24-ene-3β,20-diol；8-Methyl-18-nor-20β_FH-lanost-24-en-3β,20-diol；(3S,5R,8R,9R,10R,13R,14R,17S)-17-[(2R)-2-hydroxy-6-methylhept-5-en-2-yl]-4,4,8,10,14-pentamethyl-2,3,5,6,7,9,11,12,13,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol
• CAS: 14351-28-1
• 化学式: C₃₀H₅₂O₂
• 分子量: 444.742
• InChiKey: NLHQJXWYMZLQJY-AYHBXSNGSA-N

物化性质

• 熔点：
  83-84 °C
• 沸点：
  529.4±23.0 °C(Predicted)
• 密度：
  0.993±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  8.5
• 重原子数：
  32
• 可旋转键数：
  4
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.93
• 拓扑面积：
  40.5
• 氢给体数：
  2
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  alkaline earth salt of/the/ methylsulfuric acid 在 乙醇 、 sodium 作用下， 生成 (20R)-达马-24-烯-3beta,20-二醇
  参考文献：
  名称：

  达玛树脂的化学

  摘要：

  DOI：

  10.1039/jr9550003132

文献信息

• The Fluorine Atom as a Cation-Stabilizing Auxiliary in Biomimetic Polyene Cyclizations:  Total Synthesis of <i>dl</i>-Dammarenediol¹
  作者：William S. Johnson、William R. Bartlett、Boris A. Czeskis、Arnaud Gautier、Cheol H. Lee、Rémy Lemoine、Eric J. Leopold、Gregory R. Luedtke、Katherine J. Bancroft

  DOI：10.1021/jo991196s

  日期：1999.12.1

  Dammarenediols I (1a) and II (1b) were prepared by an efficient nonenzymatic biomimetic polyene tetracyclization route. The cyclization substrate, pentaenol 3, contains a tetramethylallylic alcohol initiator, an allyltrimethylsilane terminating group, and a fluorine atom at pro-C-13 to serve as a cation-stabilizing (C-S) auxiliary controlling the regiochemistry of the C/D ring juncture. The synthesis of 3 employed lithium-halogen exchange to create alcohols 10 and 19. The Z-fluoroalkene in 3 was introduced stereoselectively via the Trost palladium-catalyzed alkylation of allylic acetate 11 (Z/E: 4.6/1). The cyclization of 3 was most efficient (62% isolated yield) when it was added as a dilute solution in dichloromethane to trifluoroacetic acid at -45 degrees C to afford tetracyclic fluoro diene 24 possessing the trans-anti-trans-anti-trans ring stereochemistry of the dammaranes. Replacement of the fluorine atom of 24 with hydrogen with complete retention of configuration was accomplished using the Ohsawa-Oishi reagent (Na/K alloy and crown ether). Wacker oxidation of the resulting hydrocarbon provided ketone 28, which after ketalization was ozonolyzed with a reductive workup to give the SP-alcohol 30. Ketal hydrolysis followed by Grignard reaction with isopentenylmagnesium bromide afforded the dammarenediols (1/3, 1a/1b).
• The chemistry of dammar resin
  作者：J. S. Mills、A. E. A. Werner

  DOI：10.1039/jr9550003132

  日期：——