Ethyl (+/-)-3-hydroxy-2,4-dimethylpent-4-enoate | 252201-57-3

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羟基酸及其衍生物
• 英文名称: Ethyl (+/-)-3-hydroxy-2,4-dimethylpent-4-enoate
• 英文别名: Ethyl 3-hydroxy-2,4-dimethylpent-4-enoate
• CAS: 252201-57-3
• 化学式: C₉H₁₆O₃
• 分子量: 172.224
• InChiKey: UPTOZGCPFGFQFI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  12
• 可旋转键数：
  5
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  46.5
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  Ethyl (+/-)-3-hydroxy-2,4-dimethylpent-4-enoate 在 aluminum oxide 、 zinc(II) tetrahydroborate 、 pyridinium chlorochromate 作用下， 以 乙醚 、 二氯甲烷 为溶剂， 反应 48.67h， 生成 Ethyl (3R*,4S*)-(+/-)-3-hydroxy-2,4-dimethylpent-4-enoate
  参考文献：
  名称：

  Substrate-Directed Diastereoselective Hydroformylation: Key Step for the Assembly of Polypropionate Subunits

  摘要：

  Stereoselective hydroformylation of methallylic alcohols of types 3 and 4, that employed the substrate-bound catalyst-directing ortho-diphenyl-phosphanylbenzoyl (o-DPPB) group, was used as a key step for the construction of bifunctionalized stereotriads, which ale central building blocks of polyketide natural products. The required diastereomerically pure syn- and anti- starting methallylic alcohol systems 3 and 4 were obtained either by Cram-selective carbonyl reduction, Frater alkylation, or by chelation-controlled carbonyl reduction. Enantiomerically pure stereotriad building blocks were derived from a combination of an Evans aldol addition and subsequent o-DPPB-directed stereoselective hydroformylation (-->24). A crystal structure analysis for steretriad building block 24 confirmed the relative and absolute configuration of the stereogenic centers. Additionally, it provided evidence for a previously postulated preferred conformation of the catalyst-directing o-DPPB group as well as of the polyketide main chain.

  DOI：

  10.1002/(sici)1521-3765(19991001)5:10<2819::aid-chem2819>3.0.co;2-z
• 作为产物：
  描述：

  2-甲基丙烯醛 、 丙酸乙酯 在 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 正己烷 为溶剂， 反应 1.08h， 以98%的产率得到Ethyl (+/-)-3-hydroxy-2,4-dimethylpent-4-enoate
  参考文献：
  名称：

  Substrate-Directed Diastereoselective Hydroformylation: Key Step for the Assembly of Polypropionate Subunits

  摘要：

  Stereoselective hydroformylation of methallylic alcohols of types 3 and 4, that employed the substrate-bound catalyst-directing ortho-diphenyl-phosphanylbenzoyl (o-DPPB) group, was used as a key step for the construction of bifunctionalized stereotriads, which ale central building blocks of polyketide natural products. The required diastereomerically pure syn- and anti- starting methallylic alcohol systems 3 and 4 were obtained either by Cram-selective carbonyl reduction, Frater alkylation, or by chelation-controlled carbonyl reduction. Enantiomerically pure stereotriad building blocks were derived from a combination of an Evans aldol addition and subsequent o-DPPB-directed stereoselective hydroformylation (-->24). A crystal structure analysis for steretriad building block 24 confirmed the relative and absolute configuration of the stereogenic centers. Additionally, it provided evidence for a previously postulated preferred conformation of the catalyst-directing o-DPPB group as well as of the polyketide main chain.

  DOI：

  10.1002/(sici)1521-3765(19991001)5:10<2819::aid-chem2819>3.0.co;2-z

文献信息

• Substrate-Directed Diastereoselective Hydroformylation: Key Step for the Assembly of Polypropionate Subunits
  作者：Bernhard Breit、Mario Dauber、Klaus Harms

  DOI：10.1002/(sici)1521-3765(19991001)5:10<2819::aid-chem2819>3.0.co;2-z

  日期：1999.10.1

  Stereoselective hydroformylation of methallylic alcohols of types 3 and 4, that employed the substrate-bound catalyst-directing ortho-diphenyl-phosphanylbenzoyl (o-DPPB) group, was used as a key step for the construction of bifunctionalized stereotriads, which ale central building blocks of polyketide natural products. The required diastereomerically pure syn- and anti- starting methallylic alcohol systems 3 and 4 were obtained either by Cram-selective carbonyl reduction, Frater alkylation, or by chelation-controlled carbonyl reduction. Enantiomerically pure stereotriad building blocks were derived from a combination of an Evans aldol addition and subsequent o-DPPB-directed stereoselective hydroformylation (-->24). A crystal structure analysis for steretriad building block 24 confirmed the relative and absolute configuration of the stereogenic centers. Additionally, it provided evidence for a previously postulated preferred conformation of the catalyst-directing o-DPPB group as well as of the polyketide main chain.