1-diazo-3-(2-benzofuranyl)-2-propanone | 220014-42-6

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并呋喃
• 英文名称: 1-diazo-3-(2-benzofuranyl)-2-propanone
• 英文别名: 1-(1-Benzofuran-2-yl)-3-diazopropan-2-one；1-(1-benzofuran-2-yl)-3-diazopropan-2-one
• CAS: 220014-42-6
• 化学式: C₁₁H₈N₂O₂
• 分子量: 200.197
• InChiKey: YFEUQVKKRWNUSO-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  15
• 可旋转键数：
  3
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.09
• 拓扑面积：
  32.2
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  甲醇 、 1-diazo-3-(2-benzofuranyl)-2-propanone 在 dirhodium tetraacetate 作用下， 以 二氯甲烷 为溶剂， 反应 2.0h， 以58%的产率得到methyl 2-(2-methylbenzofuran-3-yl)acetate
  参考文献：
  名称：

  Intramolecular Carbenoid Insertions:  Reactions of α-Diazo Ketones Derived from Furanyl-, Thienyl-, (Benzofuranyl)-, and (Benzothienyl)acetic Acids with Rhodium(II) Acetate

  摘要：

  alpha-Diazo ketones tethered to furan, benzofuran, thiophene, and benzothiophene by a single methylene spacer have been shown to undergo atypical, rhodium(II) acetate catalyzed chemistry. For example, while treatment of 1-diazo-3-(3-furanyl)-2-propanone with Rh-2(OAc)(4) resulted in the expected 2-(4-oxo-2-cyclopentenylidene)acetaldehyde, isomeric 1-diazo-3-(2-furanyl)-2-propanone undergoes a vinylogous Wolff rearrangement and in the presence of water gives a mixture of 6a-methyl-2,3,3a,6a-tetrahydrofuro[2,3-b]furan-2-one and 2-(2-methyl-3-furyl)acetic acid. Rhodium acetate catalyzed decomposition of 1-diazo-3-(3-benzofuranyl)-2-propanone and 1-diazo-3-(2-benzofuranyl)-2-propanone are also shown to undergo vinylogous Wolff rearrangement despite the fact that this chemistry is not observed with homologous benzofuranyl systems. alpha-Diazo ketones derived from benzothienyl propionic acids undergo the expected cyclization with 1-diazo-4-(3-benzothienyl)-2-butanone and 1-diazo-4-(2-benzothienyl)-2-butanone giving rise to 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-3-one and 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-2-one, respectively. While decomposition of 1-diazo-3-(3-benzothienyl)-2-propanone resulted in the formation of 2,3-dihydro-1H-benzo[b]cyclopenta[d]thiophen-a-one, the isomeric 1-diazo-3-(2-benzothienyl)-2-propanone gave a dimer which resulted from a [3 + 2] cycloaddition followed by a [1,3]-alkyl shift. Overall, the results from this study of intramolecular carbenoid insertion into five-membered heteroaromatic systems show that the resultant chemistry is dependent on the nature of the heteroatom, position of substitution, and the length of the aliphatic tether.

  DOI：

  10.1021/jo9814593
• 作为产物：
  描述：

  2-苯并呋喃乙酸 在 草酰氯 作用下， 以 乙醚 、 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 反应 4.5h， 生成 1-diazo-3-(2-benzofuranyl)-2-propanone
  参考文献：
  名称：

  Intramolecular Carbenoid Insertions:  Reactions of α-Diazo Ketones Derived from Furanyl-, Thienyl-, (Benzofuranyl)-, and (Benzothienyl)acetic Acids with Rhodium(II) Acetate

  摘要：

  alpha-Diazo ketones tethered to furan, benzofuran, thiophene, and benzothiophene by a single methylene spacer have been shown to undergo atypical, rhodium(II) acetate catalyzed chemistry. For example, while treatment of 1-diazo-3-(3-furanyl)-2-propanone with Rh-2(OAc)(4) resulted in the expected 2-(4-oxo-2-cyclopentenylidene)acetaldehyde, isomeric 1-diazo-3-(2-furanyl)-2-propanone undergoes a vinylogous Wolff rearrangement and in the presence of water gives a mixture of 6a-methyl-2,3,3a,6a-tetrahydrofuro[2,3-b]furan-2-one and 2-(2-methyl-3-furyl)acetic acid. Rhodium acetate catalyzed decomposition of 1-diazo-3-(3-benzofuranyl)-2-propanone and 1-diazo-3-(2-benzofuranyl)-2-propanone are also shown to undergo vinylogous Wolff rearrangement despite the fact that this chemistry is not observed with homologous benzofuranyl systems. alpha-Diazo ketones derived from benzothienyl propionic acids undergo the expected cyclization with 1-diazo-4-(3-benzothienyl)-2-butanone and 1-diazo-4-(2-benzothienyl)-2-butanone giving rise to 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-3-one and 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-2-one, respectively. While decomposition of 1-diazo-3-(3-benzothienyl)-2-propanone resulted in the formation of 2,3-dihydro-1H-benzo[b]cyclopenta[d]thiophen-a-one, the isomeric 1-diazo-3-(2-benzothienyl)-2-propanone gave a dimer which resulted from a [3 + 2] cycloaddition followed by a [1,3]-alkyl shift. Overall, the results from this study of intramolecular carbenoid insertion into five-membered heteroaromatic systems show that the resultant chemistry is dependent on the nature of the heteroatom, position of substitution, and the length of the aliphatic tether.

  DOI：

  10.1021/jo9814593

文献信息

• Intramolecular Carbenoid Insertions:  Reactions of α-Diazo Ketones Derived from Furanyl-, Thienyl-, (Benzofuranyl)-, and (Benzothienyl)acetic Acids with Rhodium(II) Acetate
  作者：Kelvin Yong、Mohamed Salim、Alfredo Capretta

  DOI：10.1021/jo9814593

  日期：1998.12.1

  alpha-Diazo ketones tethered to furan, benzofuran, thiophene, and benzothiophene by a single methylene spacer have been shown to undergo atypical, rhodium(II) acetate catalyzed chemistry. For example, while treatment of 1-diazo-3-(3-furanyl)-2-propanone with Rh-2(OAc)(4) resulted in the expected 2-(4-oxo-2-cyclopentenylidene)acetaldehyde, isomeric 1-diazo-3-(2-furanyl)-2-propanone undergoes a vinylogous Wolff rearrangement and in the presence of water gives a mixture of 6a-methyl-2,3,3a,6a-tetrahydrofuro[2,3-b]furan-2-one and 2-(2-methyl-3-furyl)acetic acid. Rhodium acetate catalyzed decomposition of 1-diazo-3-(3-benzofuranyl)-2-propanone and 1-diazo-3-(2-benzofuranyl)-2-propanone are also shown to undergo vinylogous Wolff rearrangement despite the fact that this chemistry is not observed with homologous benzofuranyl systems. alpha-Diazo ketones derived from benzothienyl propionic acids undergo the expected cyclization with 1-diazo-4-(3-benzothienyl)-2-butanone and 1-diazo-4-(2-benzothienyl)-2-butanone giving rise to 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-3-one and 1,2,3,4-tetrahydrodibenzo[b,d]thiophen-2-one, respectively. While decomposition of 1-diazo-3-(3-benzothienyl)-2-propanone resulted in the formation of 2,3-dihydro-1H-benzo[b]cyclopenta[d]thiophen-a-one, the isomeric 1-diazo-3-(2-benzothienyl)-2-propanone gave a dimer which resulted from a [3 + 2] cycloaddition followed by a [1,3]-alkyl shift. Overall, the results from this study of intramolecular carbenoid insertion into five-membered heteroaromatic systems show that the resultant chemistry is dependent on the nature of the heteroatom, position of substitution, and the length of the aliphatic tether.