(1R,1aS,6aS)-1-(4-bromophenyl)-1a,6a-dihydro-1H-6-oxa-cyclopropa[a]indene-1-carboxylic acid methyl ester

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 异黄酮类化合物
• 英文名称: (1R,1aS,6aS)-1-(4-bromophenyl)-1a,6a-dihydro-1H-6-oxa-cyclopropa[a]indene-1-carboxylic acid methyl ester
• 英文别名: 1-[4-Bromophenyl]-1a,6a-dihydro-1H-6-oxacyclopropa[a]indene-1-carboxylic acid methyl ester；methyl (1R,1aS,6bS)-1-(4-bromophenyl)-1a,6b-dihydrocyclopropa[b][1]benzofuran-1-carboxylate
• 化学式: C₁₇H₁₃BrO₃
• 分子量: 345.192
• InChiKey: PJGCNFZMINFKTF-VYDXJSESSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.6
• 重原子数：
  21
• 可旋转键数：
  3
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.24
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  2,3-苯并呋喃 、 methyl 2-(4-bromophenyl)-2-diazoacetate 在 Rh₂[(N-(4-dodecylphenyl)sulfonyl)-(S)-prolinate]4 作用下， 以 正己烷 为溶剂， 反应 1.0h， 以61%的产率得到(1R,1aS,6aS)-1-(4-bromophenyl)-1a,6a-dihydro-1H-6-oxa-cyclopropa[a]indene-1-carboxylic acid methyl ester
  参考文献：
  名称：

  Investigation into Factors Influencing Stereoselectivity in the Reactions of Heterocycles with Donor−Acceptor-Substituted Rhodium Carbenoids

  摘要：

  Rhodium-catalyzed decomposition of aryldiazoacetates in the presence of pyrroles or furans results in mono- or biscyclopropanation of the heterocycle, but with opposite enantioinduction. In the absence of sterically encumbering groups, the cyclopropanation of furan occurs with initial bond formation at the 2-position. If this pathway is sterically blocked, cyclopropanation can occur with initial bond formation at the 3-position of the furan ring; in this case, the cyclopropanation reaction takes place on the opposite face of the heterocycle, and the opposite enantioinduction is observed. Upon extension of this methodology to benzofurans, a highly enantioselective monocyclopropanation reaction occurs to furnish a product derived from initial bond formation at the 2-position of the benzofuran. When this reaction pathway is inhibited by sterically encumbering substituents on the benzofuran, no cyclopropanation of the furan ring is observed, and instead, double cyclopropanation of the benzene ring occurs. Double cyclopropanation of the benzene ring was also observed in reactions with indoles.

  DOI：

  10.1021/jo060779g

文献信息

• Investigation into Factors Influencing Stereoselectivity in the Reactions of Heterocycles with Donor−Acceptor-Substituted Rhodium Carbenoids
  作者：Simon J. Hedley、Dominic L. Ventura、Paulina M. Dominiak、Cara L. Nygren、Huw M. L. Davies

  DOI：10.1021/jo060779g

  日期：2006.7.1

  Rhodium-catalyzed decomposition of aryldiazoacetates in the presence of pyrroles or furans results in mono- or biscyclopropanation of the heterocycle, but with opposite enantioinduction. In the absence of sterically encumbering groups, the cyclopropanation of furan occurs with initial bond formation at the 2-position. If this pathway is sterically blocked, cyclopropanation can occur with initial bond formation at the 3-position of the furan ring; in this case, the cyclopropanation reaction takes place on the opposite face of the heterocycle, and the opposite enantioinduction is observed. Upon extension of this methodology to benzofurans, a highly enantioselective monocyclopropanation reaction occurs to furnish a product derived from initial bond formation at the 2-position of the benzofuran. When this reaction pathway is inhibited by sterically encumbering substituents on the benzofuran, no cyclopropanation of the furan ring is observed, and instead, double cyclopropanation of the benzene ring occurs. Double cyclopropanation of the benzene ring was also observed in reactions with indoles.