5-(2-phenyl-ethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-3-isoxazolecarboxylic acid ethyl ester | 216962-18-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 5-(2-phenyl-ethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-3-isoxazolecarboxylic acid ethyl ester
• 英文别名: 3-isoxazolecarboxylic acid 5-(2-phenylethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-ethyl ester；Ethyl 5-(2-phenylethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-1,2-oxazole-3-carboxylate
• CAS: 216962-18-4
• 化学式: C₂₁H₂₇NO₅
• 分子量: 373.449
• InChiKey: HANSWWDDVWVMOA-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4
• 重原子数：
  27
• 可旋转键数：
  7
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.52
• 拓扑面积：
  70.8
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  5-(2-phenyl-ethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-3-isoxazolecarboxylic acid ethyl ester 在 对甲苯磺酸 作用下， 以 丙酮 为溶剂， 以92%的产率得到5-(2-phenyl-ethyl)-4-(1-keto-ethyl)-3-isoxazolecarboxylic acid ethyl ester
  参考文献：
  名称：

  Catalytic Asymmetric Synthesis of Glutamate Analogues

  摘要：

  Utilizing our lateral metalation coupled with Jacobsen's catalytic asymmetric amino nitrile synthesis, we have demonstrated the ability to synthesize isoxazole-containing amino acid glutamate analogues in high yield and high enantiomeric excesses. Chiral centers alpha or beta at the C-5 position do not detract from diastereoselectivity of the Jacobsen-Strecker reaction.

  DOI：

  10.1021/ol049619m
• 作为产物：
  描述：

  4-乙酰基-5-甲基异恶唑-3-甲酸乙酯 在 正丁基锂 、 对甲苯磺酸 、 二异丙胺 作用下， 以 四氢呋喃 、 正己烷 、 苯 为溶剂， 反应 12.17h， 生成 5-(2-phenyl-ethyl)-4-(2,5,5-trimethyl-1,3-dioxan-2-yl)-3-isoxazolecarboxylic acid ethyl ester
  参考文献：
  名称：

  An improved procedure for the lateral lithiation of ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate

  摘要：

  Ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate was smoothly lithiated at the 5-methyl position, when the 4-acetyl group was protected with a 5,5-dimethyl-1,3-dioxanyl group. The lithio anion was quenched with a variety of electrophiles such as alkyl halides, aldehydes, TMSCl, and Me3SnCl in good to excellent yields. The lithiation of the unprotected compound and the 4-acetyl group protected as 1,3-dioxolanyl both failed. The effects of different bases have been investigated and the addition of LiCl significantly increased yields. Based on variable temperature NMR studies the 5,5-dimethyl-1,3-dioxanyl group appears to occupy a single chair conformation which may facilitate lateral metalation. This represents a facile entry into 5-functionalized 3-isoxazolyl carboxylic acid derivatives as prodrugs for the AMPA glutamate neurotransmitters of the central nervous system. (C) 2001 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0040-4020(01)00781-5

文献信息

• Lateral lithiation of ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate with 5,5-dimethyl-1,3-dioxanyl as a directing group
  作者：Peiwen Zhou、N.R. Natale

  DOI：10.1016/s0040-4039(98)01782-1

  日期：1998.11

  Lateral lithiation of ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate, a functionalized isoxazole AMPA analog, occurs cleanly at the C-5 methyl group with 5,5-dimethyl-1,3-dioxanyl as a directing group. The 4-acetyl isoxazole derivatives were transformed selectively by a modified Willgerodt-Kindler reaction into the corresponding homologated methyl esters after deprotection. (C) 1998 Elsevier Science Ltd. All rights reserved.
• Catalytic Asymmetric Synthesis of Glutamate Analogues
  作者：David J. Burkhart、Andrew R. McKenzie、Jared K. Nelson、Katherine I. Myers、Xue Zhao、Kathy R. Magnusson、Nicholas R. Natale

  DOI：10.1021/ol049619m

  日期：2004.4.1

  Utilizing our lateral metalation coupled with Jacobsen's catalytic asymmetric amino nitrile synthesis, we have demonstrated the ability to synthesize isoxazole-containing amino acid glutamate analogues in high yield and high enantiomeric excesses. Chiral centers alpha or beta at the C-5 position do not detract from diastereoselectivity of the Jacobsen-Strecker reaction.
• An improved procedure for the lateral lithiation of ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate
  作者：David J Burkhart、Peiwen Zhou、Alex Blumenfeld、Brendan Twamley、Nicholas R Natale

  DOI：10.1016/s0040-4020(01)00781-5

  日期：2001.9

  Ethyl 4-acetyl-5-methyl-3-isoxazolyl carboxylate was smoothly lithiated at the 5-methyl position, when the 4-acetyl group was protected with a 5,5-dimethyl-1,3-dioxanyl group. The lithio anion was quenched with a variety of electrophiles such as alkyl halides, aldehydes, TMSCl, and Me3SnCl in good to excellent yields. The lithiation of the unprotected compound and the 4-acetyl group protected as 1,3-dioxolanyl both failed. The effects of different bases have been investigated and the addition of LiCl significantly increased yields. Based on variable temperature NMR studies the 5,5-dimethyl-1,3-dioxanyl group appears to occupy a single chair conformation which may facilitate lateral metalation. This represents a facile entry into 5-functionalized 3-isoxazolyl carboxylic acid derivatives as prodrugs for the AMPA glutamate neurotransmitters of the central nervous system. (C) 2001 Elsevier Science Ltd. All rights reserved.