6-Oxo-5-phenyl-3a,4,5,6-tetrahydro-3H-pyrrolo<3,4-c>pyrazole-6a-carboxylic acid ethyl ester | 156115-71-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡咯烷类
• 英文名称: 6-Oxo-5-phenyl-3a,4,5,6-tetrahydro-3H-pyrrolo<3,4-c>pyrazole-6a-carboxylic acid ethyl ester
• 英文别名: ethyl 6-oxo-5-phenyl-3a,4-dihydro-3H-pyrrolo[3,4-c]pyrazole-6a-carboxylate
• CAS: 156115-71-8
• 化学式: C₁₄H₁₅N₃O₃
• 分子量: 273.291
• InChiKey: YAYIYLCHSGNEHS-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.6
• 重原子数：
  20
• 可旋转键数：
  4
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  71.3
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  6-Oxo-5-phenyl-3a,4,5,6-tetrahydro-3H-pyrrolo<3,4-c>pyrazole-6a-carboxylic acid ethyl ester 在 对甲苯磺酸 作用下， 以 二氯甲烷 为溶剂， 生成 Ethyl 5-phenyl-1,3a,4,5,6,6a-hexahydro-6-oxopyrrolo<3,4-c>pyrazole-6a-carboxylate
  参考文献：
  名称：

  Ligand Effects in the Rhodium(II)-Catalyzed Reactions of .alpha.-Diazoamides. Oxindole Formation is Promoted by the Use of Rhodium(II) Perfluorocarboxamide Catalysts

  摘要：

  An improved procedure for the preparation of ethyl 2-diazomalonyl chloride ws developed which involves the reaction of ethyl diazoacetate with triphosgene. Using this diazo acid chloride, it was possible to prepare a variety of diazoamides from substituted amines. The rhodium(II)-catalyzed decomposition of these diazoamides was studied in order to probe the chemoselectivity of the carbenoid intermediates in intramolecular insertion reactions. Rhodium(II) acetate decomposition of N-benzyl-2-diazo-N-phenylmalonamic acid ethyl ester resulted in intramolecular C-H insertion to give ethyl 1,4-diphenyl-2-oxoazetidine-3-carboxylate. By changing the catalyst ligand to trifluoroacetamide, beta-lactam formation was completely suppressed in favor of the aromatic C-H insertion which produces an oxindole as the only detectable product. The competition between aliphatic and aromatic carbon-hydrogen insertion of 2-diazo-N-phenylmalonamic acid ethyl ester provides another example of ligand effectiveness in controlling chemoselectivity in dirhodium(II)-catalyzed metal carbene reactions. Thus, treatment of the N-isobutyldiazoanilide with rhodium(II) acetate results in exclusive aliphatic C-H insertion giving 4,4-dimethyl-2-oxo-1-phenylpyrrolidine-3-carboxylic acid ethyl ester, while the perfluorobutyramide ligand promotes oxidinole formation by aromatic C-H insertion. Several other rhodium(II)-catalyzed reactions were studied and were found to be highly catalyst dependent, rhodium(II) perfluorocarboxamides promoting aromatic C-H insertion, and hence oxindole formation, over O-H insertion, cyclization onto adjacent triple bonds, or cyclization to generate 1,3-dipolar intermediates.

  DOI：

  10.1021/jo00088a028
• 作为产物：
  描述：

  N-Allyl-2-diazo-N-phenylmalonamic acid ethyl ester 以 苯 为溶剂， 反应 2.0h， 以66%的产率得到6-Oxo-5-phenyl-3a,4,5,6-tetrahydro-3H-pyrrolo<3,4-c>pyrazole-6a-carboxylic acid ethyl ester
  参考文献：
  名称：

  Ligand Effects in the Rhodium(II)-Catalyzed Reactions of .alpha.-Diazoamides. Oxindole Formation is Promoted by the Use of Rhodium(II) Perfluorocarboxamide Catalysts

  摘要：

  An improved procedure for the preparation of ethyl 2-diazomalonyl chloride ws developed which involves the reaction of ethyl diazoacetate with triphosgene. Using this diazo acid chloride, it was possible to prepare a variety of diazoamides from substituted amines. The rhodium(II)-catalyzed decomposition of these diazoamides was studied in order to probe the chemoselectivity of the carbenoid intermediates in intramolecular insertion reactions. Rhodium(II) acetate decomposition of N-benzyl-2-diazo-N-phenylmalonamic acid ethyl ester resulted in intramolecular C-H insertion to give ethyl 1,4-diphenyl-2-oxoazetidine-3-carboxylate. By changing the catalyst ligand to trifluoroacetamide, beta-lactam formation was completely suppressed in favor of the aromatic C-H insertion which produces an oxindole as the only detectable product. The competition between aliphatic and aromatic carbon-hydrogen insertion of 2-diazo-N-phenylmalonamic acid ethyl ester provides another example of ligand effectiveness in controlling chemoselectivity in dirhodium(II)-catalyzed metal carbene reactions. Thus, treatment of the N-isobutyldiazoanilide with rhodium(II) acetate results in exclusive aliphatic C-H insertion giving 4,4-dimethyl-2-oxo-1-phenylpyrrolidine-3-carboxylic acid ethyl ester, while the perfluorobutyramide ligand promotes oxidinole formation by aromatic C-H insertion. Several other rhodium(II)-catalyzed reactions were studied and were found to be highly catalyst dependent, rhodium(II) perfluorocarboxamides promoting aromatic C-H insertion, and hence oxindole formation, over O-H insertion, cyclization onto adjacent triple bonds, or cyclization to generate 1,3-dipolar intermediates.

  DOI：

  10.1021/jo00088a028

文献信息

• Ligand Effects in the Rhodium(II)-Catalyzed Reactions of .alpha.-Diazoamides. Oxindole Formation is Promoted by the Use of Rhodium(II) Perfluorocarboxamide Catalysts
  作者：David S. Brown、Mark C. Elliott、Christopher J. Moody、Timothy J. Mowlem、Joseph P. Jr. Marino、Albert Padwa

  DOI：10.1021/jo00088a028

  日期：1994.5

  An improved procedure for the preparation of ethyl 2-diazomalonyl chloride ws developed which involves the reaction of ethyl diazoacetate with triphosgene. Using this diazo acid chloride, it was possible to prepare a variety of diazoamides from substituted amines. The rhodium(II)-catalyzed decomposition of these diazoamides was studied in order to probe the chemoselectivity of the carbenoid intermediates in intramolecular insertion reactions. Rhodium(II) acetate decomposition of N-benzyl-2-diazo-N-phenylmalonamic acid ethyl ester resulted in intramolecular C-H insertion to give ethyl 1,4-diphenyl-2-oxoazetidine-3-carboxylate. By changing the catalyst ligand to trifluoroacetamide, beta-lactam formation was completely suppressed in favor of the aromatic C-H insertion which produces an oxindole as the only detectable product. The competition between aliphatic and aromatic carbon-hydrogen insertion of 2-diazo-N-phenylmalonamic acid ethyl ester provides another example of ligand effectiveness in controlling chemoselectivity in dirhodium(II)-catalyzed metal carbene reactions. Thus, treatment of the N-isobutyldiazoanilide with rhodium(II) acetate results in exclusive aliphatic C-H insertion giving 4,4-dimethyl-2-oxo-1-phenylpyrrolidine-3-carboxylic acid ethyl ester, while the perfluorobutyramide ligand promotes oxidinole formation by aromatic C-H insertion. Several other rhodium(II)-catalyzed reactions were studied and were found to be highly catalyst dependent, rhodium(II) perfluorocarboxamides promoting aromatic C-H insertion, and hence oxindole formation, over O-H insertion, cyclization onto adjacent triple bonds, or cyclization to generate 1,3-dipolar intermediates.