(3S,7aR)-5-Oxo-3-phenyl-hexahydro-pyrrolo[2,1-b]oxazole-6-carboxylic acid benzyl ester | 1026169-44-7

• 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: (3S,7aR)-5-Oxo-3-phenyl-hexahydro-pyrrolo[2,1-b]oxazole-6-carboxylic acid benzyl ester
• 英文别名: benzyl (3S,7aR)-5-oxo-3-phenyl-3,6,7,7a-tetrahydro-2H-pyrrolo[2,1-b][1,3]oxazole-6-carboxylate
• CAS: 1026169-44-7
• 化学式: C₂₀H₁₉NO₄
• 分子量: 337.375
• InChiKey: RCJUEWREMZEBRC-UKKPGEIXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  25
• 可旋转键数：
  5
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  55.8
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (3S,7aR)-5-Oxo-3-phenyl-hexahydro-pyrrolo[2,1-b]oxazole-6-carboxylic acid benzyl ester 在 palladium on activated charcoal 苯基溴化硒 、 双氧水 、 ammonium formate 作用下， 反应 5.0h， 生成 (3S,7R,7aR)-3,7-diphenyl-3,6,7,7a-tetrahydro-2H-pyrrolo[2,1-b][1,3]oxazol-5-one
  参考文献：
  名称：

  The synthesis of aracemic 4-substituted pyrrolidinones and 3-substituted pyrrolidines. An asymmetric synthesis of (-)-rolipram

  摘要：

  Conjugate additions of RCuCNLi to the chiral alpha,beta-unsaturated lactam 4 gives almost exclusive exo addition-a reversal in stereochemistry when cuprates were added to chiral lactam 1. The lactams 5 were transformed into 4-substituted pyrrolidinones 8 via a three-step sequence which involved decarbalkoxylation, silane reduction and metal-ammonia benzylamine cleavage. The chemical yields as well as the enantiomeric purity were very high for this process. As an example of the usefulness of this scheme, the antidepressant (-)-Rolipram was prepared in good overall yield. Furthermore, the bicyclic lactams 6 were readily transformed, using alane as the reducing agent, to 3-substituted pyrrolidines 11. Absolute configurations of 8 and 11 were confirmed by comparison with literature assignments which also gave strong support to the facial addition of the cuprates to 4.

  DOI：

  10.1021/jo00053a012
• 作为产物：
  描述：

  (3S-顺式)-(-)-3-苯基四氢吡咯并-[2,1-b]-恶唑-5(6H)-酮 、 氯甲酸苄酯 在 lithium hexamethyldisilazane 作用下， 生成 (3S,7aR)-5-Oxo-3-phenyl-hexahydro-pyrrolo[2,1-b]oxazole-6-carboxylic acid benzyl ester
  参考文献：
  名称：

  The synthesis of aracemic 4-substituted pyrrolidinones and 3-substituted pyrrolidines. An asymmetric synthesis of (-)-rolipram

  摘要：

  Conjugate additions of RCuCNLi to the chiral alpha,beta-unsaturated lactam 4 gives almost exclusive exo addition-a reversal in stereochemistry when cuprates were added to chiral lactam 1. The lactams 5 were transformed into 4-substituted pyrrolidinones 8 via a three-step sequence which involved decarbalkoxylation, silane reduction and metal-ammonia benzylamine cleavage. The chemical yields as well as the enantiomeric purity were very high for this process. As an example of the usefulness of this scheme, the antidepressant (-)-Rolipram was prepared in good overall yield. Furthermore, the bicyclic lactams 6 were readily transformed, using alane as the reducing agent, to 3-substituted pyrrolidines 11. Absolute configurations of 8 and 11 were confirmed by comparison with literature assignments which also gave strong support to the facial addition of the cuprates to 4.

  DOI：

  10.1021/jo00053a012

文献信息

• The synthesis of aracemic 4-substituted pyrrolidinones and 3-substituted pyrrolidines. An asymmetric synthesis of (-)-rolipram
  作者：A. I. Meyers、Lawrence Snyder

  DOI：10.1021/jo00053a012

  日期：1993.1

  Conjugate additions of RCuCNLi to the chiral alpha,beta-unsaturated lactam 4 gives almost exclusive exo addition-a reversal in stereochemistry when cuprates were added to chiral lactam 1. The lactams 5 were transformed into 4-substituted pyrrolidinones 8 via a three-step sequence which involved decarbalkoxylation, silane reduction and metal-ammonia benzylamine cleavage. The chemical yields as well as the enantiomeric purity were very high for this process. As an example of the usefulness of this scheme, the antidepressant (-)-Rolipram was prepared in good overall yield. Furthermore, the bicyclic lactams 6 were readily transformed, using alane as the reducing agent, to 3-substituted pyrrolidines 11. Absolute configurations of 8 and 11 were confirmed by comparison with literature assignments which also gave strong support to the facial addition of the cuprates to 4.