(2S,3R)-2-(benzyloxy)-3-<(p-methoxybenzyl)oxy>-2-<<(p-methoxybenzyl)oxy>methyl>-4-pentenal | 217819-76-6

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: (2S,3R)-2-(benzyloxy)-3-<(p-methoxybenzyl)oxy>-2-<<(p-methoxybenzyl)oxy>methyl>-4-pentenal
• 英文别名: (2S,3R)-3-[(4-methoxyphenyl)methoxy]-2-[(4-methoxyphenyl)methoxymethyl]-2-phenylmethoxypent-4-enal
• CAS: 217819-76-6
• 化学式: C₂₉H₃₂O₆
• 分子量: 476.569
• InChiKey: MZUPPNDABZEPIC-WDYNHAJCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.3
• 重原子数：
  35
• 可旋转键数：
  15
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.28
• 拓扑面积：
  63.2
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  (2S,3R)-2-(benzyloxy)-3-<(p-methoxybenzyl)oxy>-2-<<(p-methoxybenzyl)oxy>methyl>-4-pentenal 在 4-二甲氨基吡啶 、 lithium aluminium tetrahydride 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 反应 5.5h， 生成 (2S,3R)-2-(benzyloxy)-3-[(p-methoxybenzyl)oxy]-2-{[(p-methoxybenzyl)oxy]methyl}-4-penten-1-yl pivalate
  参考文献：
  名称：

  10.1002/1099-0690(200006)2000:12<2187::aid-ejoc2187<3.0.co;2-2

  摘要：

  DOI：

  10.1002/1099-0690(200006)2000:12<2187::aid-ejoc2187<3.0.co;2-2
• 作为产物：
  描述：

  ethyl 2-O-benzyl-5-deoxy-5-iodo-3-O-(p-methoxybenzyl)-2-C-<<(p-methoxybenzyl)oxy>methyl>-D-arabinofuranoside 在 锌 作用下， 以 甲醇 为溶剂， 反应 1.5h， 以93%的产率得到(2S,3R)-2-(benzyloxy)-3-<(p-methoxybenzyl)oxy>-2-<<(p-methoxybenzyl)oxy>methyl>-4-pentenal
  参考文献：
  名称：

  Stereochemical Models for the Enantiocontrolled Construction of Fully Functionalized C Rings via Intramolecular Aldolization in Advanced Precursors to Paclitaxel

  摘要：

  Six transition-state models for intramolecular aldol C-ring annulation in suitably substituted bicyclo-[6.2.1]undecanones have been defined. The first consideration is the inherent conformational flexibility of the nine-membered ketonic ring which does not limit effective deprotonation to a single C-8 epimer. When the oxygen substituents at C-4 and C-5 are not covalently linked, the configuration at C-5 defines the stereochemical course of the ring closure, with only the beta series being amenable to the proper elaboration of paclitaxel. When C-4 and C-5 are incorporated into a 1,3-dioxane ring instead, the principal stereocontrol element is translocated into the aryl-substituted carbon of the cyclic acetal. To the extent that the Ar group remains equatorially disposed, then proper aldolization will materialize in only one of the four possible diastereomers. Experimental tests that are provided for three of the models are shown to conform to expectations. This analysis of the origin of stereoselectivity has, for the first time, defined the scope and limitations associated with C-ring closure by means of the aldol protocol.

  DOI：

  10.1021/jo981749j

文献信息

• Synthesis of stereodefined Z-vinyl iodides from carbohydrates as a prelude to C/D ring assembly in taxanes
  作者：Leo A. Paquette、Tzenge-Lien Shih、Qingbei Zeng、John E. Hofferberth

  DOI：10.1016/s0040-4039(99)00546-8

  日期：1999.4

  D-Mannitol has been transformed into 10 and 14, while D-glucose has served as precursor to 20. In the latter example, key steps include stereocontrolled vinylation, oxidative fragmentation of the tetrahydrofuran-2,3-diol, oxetane ring closure, and highly stereoselective iodoolefination. (C) 1999 Elsevier Science Ltd. All rights reserved.
• Stereochemical Models for the Enantiocontrolled Construction of Fully Functionalized C Rings via Intramolecular Aldolization in Advanced Precursors to Paclitaxel
  作者：Leo A. Paquette、Qingbei Zeng、Hon-Chung Tsui、Jeffrey N. Johnston

  DOI：10.1021/jo981749j

  日期：1998.11.1

  Six transition-state models for intramolecular aldol C-ring annulation in suitably substituted bicyclo-[6.2.1]undecanones have been defined. The first consideration is the inherent conformational flexibility of the nine-membered ketonic ring which does not limit effective deprotonation to a single C-8 epimer. When the oxygen substituents at C-4 and C-5 are not covalently linked, the configuration at C-5 defines the stereochemical course of the ring closure, with only the beta series being amenable to the proper elaboration of paclitaxel. When C-4 and C-5 are incorporated into a 1,3-dioxane ring instead, the principal stereocontrol element is translocated into the aryl-substituted carbon of the cyclic acetal. To the extent that the Ar group remains equatorially disposed, then proper aldolization will materialize in only one of the four possible diastereomers. Experimental tests that are provided for three of the models are shown to conform to expectations. This analysis of the origin of stereoselectivity has, for the first time, defined the scope and limitations associated with C-ring closure by means of the aldol protocol.
• 10.1002/1099-0690(200006)2000:12<2187::aid-ejoc2187<3.0.co;2-2
  作者：Paquette, Leo、Zeng, Qingbei、Wang, Hui-Ling、Shih, Tzenge-Lien

  DOI：10.1002/1099-0690(200006)2000:12<2187::aid-ejoc2187<3.0.co;2-2

  日期：——