1β,6α,12-triacetoxy-4α-hydroxy-5α,11β-H-eudesmane | 143662-90-2

• 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: 1β,6α,12-triacetoxy-4α-hydroxy-5α,11β-H-eudesmane
• 英文别名: 1β,6β,12-triacetoxy-4α-hydroxy-5α,11β-H-eudesmane；[(2S)-2-[(1S,2S,4aR,5R,8R,8aS)-1,5-diacetyloxy-8-hydroxy-4a,8-dimethyl-1,2,3,4,5,6,7,8a-octahydronaphthalen-2-yl]propyl] acetate
• CAS: 143662-90-2
• 化学式: C₂₁H₃₄O₇
• 分子量: 398.497
• InChiKey: KQYPBAARYLQQDC-NNOBFJDCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  28
• 可旋转键数：
  8
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  99.1
• 氢给体数：
  1
• 氢受体数：
  7

反应信息

• 作为产物：
  描述：

  vulgarin 在 platinum on activated charcoal 吡啶 、 lithium aluminium tetrahydride 、 氢气 作用下， 生成 1β,6α,12-triacetoxy-4α-hydroxy-5α,11β-H-eudesmane
  参考文献：
  名称：

  由6α-倍半萜内酯部分合成6β-倍半萜内酯

  摘要：

  使用化学方法实现了具有一些功能化的6α-大麦醇内酯在C-6的差向异构化为7β-大麦醇内酰胺。该方法包括LiAlH 4还原6α-内酯，在C-12处羟甲基的选择性乙酰化，在C-6处氧化和还原以使该碳异构化，在C-12处脱乙酰基和最终形成6β-内酯。含RuH 2（Ph 3 P）4。整个过程产生近40％的6β-内酯，限制步骤是用钌试剂（58和53％）进行氧化。

  DOI：

  10.1016/s0040-4039(00)74823-4

文献信息

• Partial synthesis of 6β-eudesmanolides and 6β-guaianolides from 6α-eudesmanolides: Synthesis of analogues of artepaulin, colartin and tannunolide D
  作者：José L. Bretón、Juan J. Cejudo、Andrés García-Granados、Andrés Parra、Francisco Rivas

  DOI：10.1016/s0040-4020(01)87003-4

  日期：1994.2

  The epimerization process consists of the LiA1H4 reduction of a 6α-lactone, selective protection of the hydroxymethylene group at C-12, oxidation and reduction at C-6 to epimerize this carbon, deprotection at C-12 and finally, lactonization with tetrapropylammonium perruthenate (TPAP) and 4-methylmorpholine N-oxide (NMO) in yields over 80%. The rearrangement of 1β-hydroxy-6β-colartin allow us to obtain

  通过化学方法实现多官能化的6α-马来酸酐在C-6的差向异构化，以获得6β-马来酸酐，并且在重排后获得6β-愈创木酚内酯。差向异构化过程包括LiA1H 4还原6α-内酯，对C-12处的羟甲基进行选择性保护，在C-6处进行氧化和还原以使该碳异构化，在C-12处进行脱保护，最后用四丙基过钌酸内酯进行内酯化（TPAP）和4-甲基吗啉N-氧化物（NMO），收率超过80％。1β-羟基-6β-colartin的重排使我们可以获得2,3-二氢-6β-鞣酸内酯D.
• Regioselective Enzymatic Acylations of Polyhydroxylated Eudesmanes:  Semisynthesis, Theoretical Calculations, and Biotransformation of Cyclic Sulfites
  作者：Andrés García-Granados、Enrique Melguizo、Andrés Parra、Yolanda Simeó、Beatriz Viseras、J. A. Dobado、José Molina、J. M. Arias

  DOI：10.1021/jo0008183

  日期：2000.12.1

  Different lipase enzymes have been tested in order to perform regioselective acetylations on the eudesmane tetrol from vulgarin. High yields (95%) of 1,12-diacetoxy derivative (4) were achieved in Ih with Candida antarctica Lipase (CAL). However, only the la-acetyl derivative (6) was obtained in similar yield with Mucor miehei (MML) or Candida cylindracea (CCL) lipases. The enzymatic protection at C-l and C-12 has been used to form eudesmane cyclic-sulfites between C-6 and C-4 atoms. The RIS-sulfur configuration has been assigned by means of the experimental and theoretical C-13 and H-1 NMR chemical shifts. The theoretical shifts were calculated using the GIAO method, with a MM+ geometry optimization followed by a single-point calculation at the B3LYP/6-31G* level (B3LYP/6-31G*//MM+). Moreover, B3LYP/6-31G* geometry optimizations were carried out to test the B3LYP/6-31G*//MM+ results, for the deacetylated sulfites (12 and 15). In addition to the delta (C) and delta (H) shifts, the (3)J(HH) coupling constants were also calculated and compared with the experimental values when available. Finally, different reactivities have been checked in both sulfites by biotransformation with Rhizopus nigricans. While the R-sulfite gave 2 alpha- and 11 beta -hydroxylated metabolites, the S-sulfite yielded only regioselective deacetylations. Furthermore, both sulfites showed different reactivities in redox processes.