10β,14β-dihydroxy-2α,5α-diacetoxy-4(20),11-taxadiene | 167355-42-2

• 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: 10β,14β-dihydroxy-2α,5α-diacetoxy-4(20),11-taxadiene
• 英文别名: 10,14-desacetyl taxuyunnanine C；10,14-dideacetyltaxuyunnanine C；[(1S,2S,3S,5S,8S,10S,14S)-2-acetyloxy-10,14-dihydroxy-8,12,15,15-tetramethyl-4-methylidene-5-tricyclo[9.3.1.03,8]pentadec-11-enyl] acetate
• CAS: 167355-42-2
• 化学式: C₂₄H₃₆O₆
• 分子量: 420.546
• InChiKey: YVRSQDAUMAIYGJ-XHNBIOFNSA-N

物化性质

• 沸点：
  514.5±50.0 °C(Predicted)
• 密度：
  1.17±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  30
• 可旋转键数：
  4
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  93.1
• 氢给体数：
  2
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  10β,14β-dihydroxy-2α,5α-diacetoxy-4(20),11-taxadiene 在 15-day Ginkgo biloba cell suspension culture 作用下， 以 乙醇 为溶剂， 反应 144.0h， 以20%的产率得到9α,10β,14β-trihydroxy-2α,5α-diacetoxy-4(20),11-taxadiene
  参考文献：
  名称：

  Substrate specificity for the hydroxylation of polyoxygenated 4(20),11-taxadienes by Ginkgo cell suspension cultures

  摘要：

  Three C-14 oxygenated taxanes isolated from callus cultures of Taxus spp., 2alpha,5alpha,10beta,14beta-tetra-acetoxy-4(20), 11-taxadiene 3, 2alpha,5alpha,10beta-triacetoxy-14beta-propionyloxy-4(20),11-taxadiene 4, 2alpha,5alpha,10beta-triacetoxy-14beta-(2-methylbutyryl)-oxy-4(20),I I-taxadiene 5, and three deacetylated derivatives of 3, 10beta-hydroxy-2alpha,5alpha,14beta-triacetoxy-4(20),11-taxadiene 6, 14beta-hydroxy-2alpha,5alpha, 10beta-triacetoxy-4(20),11-taxadiene 7, 10beta,14beta-dihydroxy-2alpha,5alpha-diacetoxy-4(20),11-taxadiene 8, could all be regio- and stereo-selectively hydroxylated at the 9alpha-position by Ginkgo cell suspension cultures to yield a series of new 9alpha,14beta-dihydroxylated taxoids. The effects of functional groups, especially at C-14 of the substrates, on the biotransformation were also investigated. The results revealed that substrates with an acetoxyl group at C-14 could be more efficiently 9alpha-hydroxylated than those with a longer ester chain or a hydroxyl group at C-14. An acetoxyl or hydroxyl group at C-10 had no effect on the conversion rates of the substrates, but substrates with the hydroxyl group (compared with the acetoxyl analogues) could be converted into 9alpha-hydroxylated products more easily. (C) 2003 Elsevier Science (USA). All rights reserved.

  DOI：

  10.1016/s0045-2068(03)00063-4
• 作为产物：
  描述：

  taxuyunnanin C 在 sodium hydroxide 作用下， 以 甲醇 为溶剂， 以60%的产率得到10β-hydroxy-2α,5α14β-triacetoxytaxa-4(20),11(12)-diene
  参考文献：
  名称：

  Special publicationfn1fn1Papers with this heading have received accelerated publication, due to their particular significance in the field of phytochemistry. Purification and characterization of acetyl coenzyme a: 10-hydroxytaxane O-acetyltransferase from cell suspension cultures of Taxus chinensis

  摘要：

  An O-acetyltransferase that catalyzes the regiospecific acetylation of a range of taxanes possessing an unsubstituted 10-hydroxyl group was detected and purified to apparent electrophoretic homogeneity from a cytosolic fraction of Taxus chinensis cell cultures. The purification involved negative calcium phosphate adsorption, sephadex desalting, DEAE, AcA44 chromatography, HighQ, CHT II, HiTrap Blue, Phenylsepharose and Mimetic Green purification steps. The purified acetyltransferase was found to be a monomeric protein of 71 +/- 1.5 kDa that is highly regio- and stereospecific towards the 10 beta-hydroxyl group of the taxane molecule and is also active towards 10-desacetylbaccatine III. The acetyltransferase reaction had a pH optimum of 9.0 with halfmaximal activities at pH 6.8 and 10.8, respectively. The temperature optimum was at 35 degrees C and the isoelectric point at 5.6. The apparent K-m values for 10-desacetyltaxuyunnanine C and acetyl CoA were 23 and 61 mu M, respectively. The turnover rate for the enzyme using both substrates was 0.2 mol mol(-1) of enzyme. The kinetic optimum was determined to be K-cat/K-m = 8.7 s(-1) L M-1. (C) 1999 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0031-9422(98)00674-8

文献信息

• Synthesis and structure–activity relationships of taxuyunnanine C derivatives as multidrug resistance modulator in MDR cancer cells
  作者：Toshiaki Hasegawa、Jiao Bai、Jungui Dai、Liming Bai、Junichi Sakai、Shigenori Nishizawa、Yuhua Bai、Midori Kikuchi、Mariko Abe、Takao Yamori、Akihiro Tomida、Takashi Tsuruo、Katsutoshi Hirose、Masayoshi Ando

  DOI：10.1016/j.bmcl.2007.04.030

  日期：2007.7

  the multidrug resistance of cancer cells. The cytotoxicity (IC(50)) of the compounds was examined against human normal cell line, WI-38, and cancer model cell lines, VA-13 and HepG2. Since compounds 6 and 8 had no cytotoxicity, they were expected to be lead compounds of MDR cancer reversal agents. On the contrary, compounds 3, 5, and 9a showed cell growth inhibitory activity toward VA-13 and/or HepG2

  通过对紫杉云南碱C进行化学修饰和生物转化，获得了一系列在不同位置（如C-2，C-5，C-7，C-9，C-10或C-14）带有较大基团的新一代紫杉类化合物（1 ）及其类似物4、5和10。化合物3、5、6、8和9a对MDR 2780AD细胞中的钙黄绿素蓄积具有显着的活性。实际上，最有效的化合物9a在C-14处具有肉桂酰氧基，在C-10处具有羟基，实际上对于MDR 2780AD细胞中抗癌剂长春新碱的细胞蓄积是有效的。6和9a对紫杉醇，阿霉素和长春新碱的增强作用与维拉帕米对MDR 2780AD细胞的增强作用相同。因此，化合物6和9a可以调节癌细胞的多药耐药性。检查了这些化合物对人正常细胞系的细胞毒性（IC（50）），WI-38和癌细胞模型VA-13和HepG2。由于化合物6和8没有细胞毒性，因此它们有望成为MDR癌症逆转剂的先导化合物。相反，化合物3、5和9a在MDR 2780AD中表现出对VA-
• Substrate specificity for the hydroxylation of polyoxygenated 4(20),11-taxadienes by Ginkgo cell suspension cultures
  作者：Jungui Dai、Min Ye、Hongzhu Guo、Weihua Zhu、Dayong Zhang、Qiu Hu、Junhua Zheng、Dean Guo

  DOI：10.1016/s0045-2068(03)00063-4

  日期：2003.8

  Three C-14 oxygenated taxanes isolated from callus cultures of Taxus spp., 2alpha,5alpha,10beta,14beta-tetra-acetoxy-4(20), 11-taxadiene 3, 2alpha,5alpha,10beta-triacetoxy-14beta-propionyloxy-4(20),11-taxadiene 4, 2alpha,5alpha,10beta-triacetoxy-14beta-(2-methylbutyryl)-oxy-4(20),I I-taxadiene 5, and three deacetylated derivatives of 3, 10beta-hydroxy-2alpha,5alpha,14beta-triacetoxy-4(20),11-taxadiene 6, 14beta-hydroxy-2alpha,5alpha, 10beta-triacetoxy-4(20),11-taxadiene 7, 10beta,14beta-dihydroxy-2alpha,5alpha-diacetoxy-4(20),11-taxadiene 8, could all be regio- and stereo-selectively hydroxylated at the 9alpha-position by Ginkgo cell suspension cultures to yield a series of new 9alpha,14beta-dihydroxylated taxoids. The effects of functional groups, especially at C-14 of the substrates, on the biotransformation were also investigated. The results revealed that substrates with an acetoxyl group at C-14 could be more efficiently 9alpha-hydroxylated than those with a longer ester chain or a hydroxyl group at C-14. An acetoxyl or hydroxyl group at C-10 had no effect on the conversion rates of the substrates, but substrates with the hydroxyl group (compared with the acetoxyl analogues) could be converted into 9alpha-hydroxylated products more easily. (C) 2003 Elsevier Science (USA). All rights reserved.
• Special publicationfn1fn1Papers with this heading have received accelerated publication, due to their particular significance in the field of phytochemistry. Purification and characterization of acetyl coenzyme a: 10-hydroxytaxane O-acetyltransferase from cell suspension cultures of Taxus chinensis
  作者：Birgitta Menhard、Meinhart H Zenk

  DOI：10.1016/s0031-9422(98)00674-8

  日期：1999.3

  An O-acetyltransferase that catalyzes the regiospecific acetylation of a range of taxanes possessing an unsubstituted 10-hydroxyl group was detected and purified to apparent electrophoretic homogeneity from a cytosolic fraction of Taxus chinensis cell cultures. The purification involved negative calcium phosphate adsorption, sephadex desalting, DEAE, AcA44 chromatography, HighQ, CHT II, HiTrap Blue, Phenylsepharose and Mimetic Green purification steps. The purified acetyltransferase was found to be a monomeric protein of 71 +/- 1.5 kDa that is highly regio- and stereospecific towards the 10 beta-hydroxyl group of the taxane molecule and is also active towards 10-desacetylbaccatine III. The acetyltransferase reaction had a pH optimum of 9.0 with halfmaximal activities at pH 6.8 and 10.8, respectively. The temperature optimum was at 35 degrees C and the isoelectric point at 5.6. The apparent K-m values for 10-desacetyltaxuyunnanine C and acetyl CoA were 23 and 61 mu M, respectively. The turnover rate for the enzyme using both substrates was 0.2 mol mol(-1) of enzyme. The kinetic optimum was determined to be K-cat/K-m = 8.7 s(-1) L M-1. (C) 1999 Elsevier Science Ltd. All rights reserved.

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