2-n-Butyl-4-hydroxy-3-methyl-2-cyclobuten-1-one | 151664-38-9

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2-n-Butyl-4-hydroxy-3-methyl-2-cyclobuten-1-one
• 英文别名: 2-Butyl-4-hydroxy-3-methylcyclobut-2-en-1-one
• CAS: 151664-38-9
• 化学式: C₉H₁₄O₂
• 分子量: 154.209
• InChiKey: QNSAVLICBBTDDA-UHFFFAOYSA-N

物化性质

• 沸点：
  274.5±29.0 °C(predicted)
• 密度：
  1.068±0.06 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  11
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  37.3
• 氢给体数：
  1
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2-n-Butyl-4-hydroxy-3-methyl-2-cyclobuten-1-one 在 四氯化碳 、 三苯基膦 作用下， 以 乙腈 为溶剂， 反应 1.0h， 以91%的产率得到2-n-Butyl-4-chloro-3-methyl-2-cyclobutenone
  参考文献：
  名称：

  A general, regioselective synthesis of substituted benzocyclobutenedione monoacetals

  摘要：

  A general, regioselective synthesis of substituted benzocyclobutenedione monoacetals is reported. Palladium-catalyzed coupling of a variety of 4-chlorocyclobutenones with 3-(tri-n-butylstannyl)-3-cyclobutene-1,2-dione 2-(ethylene acetal) and heating up to 70-100-degrees-C produces substituted benzocyclobutenedione monoacetals in good to excellent yields. Thia chemistry is presumed to proceed through palladium-catalyzed formation of a 3-(1-oxo-2-cyclobuten-4-yl)-3-cyclobutene-1,2-dione-2-(ethylene acetal) followed by a thermally induced ring opening to a dienyl ketene and subsequent six-electron electrocyclic ring closure and tautomerization. 2,3-Disubstituted 4-chlorocyclobutenones afford palladium intermediates which couple exclusively at the least-substituted allylic terminus. 2,3,4-Trisubstituted 4-chlorocyclobutenones have not been studied in detail; however, preliminary results suggest that regioselective allylic cross-coupling can be achieved. The methodology described provides an expedient and efficient route to previously difficult-to-prepare benzocyclobutenedione derivatives. These function as important synthetic intermediates in a variety of reactions developed in these and other laboratories.

  DOI：

  10.1021/jo00067a029
• 作为产物：
  描述：

  2-n-Butyl-4-hydroxy-3-methyl-2-cyclobutenone ethylene acetal 在 盐酸 作用下， 以 四氢呋喃 为溶剂， 反应 0.75h， 生成 2-n-Butyl-4-hydroxy-3-methyl-2-cyclobuten-1-one
  参考文献：
  名称：

  A general, regioselective synthesis of substituted benzocyclobutenedione monoacetals

  摘要：

  A general, regioselective synthesis of substituted benzocyclobutenedione monoacetals is reported. Palladium-catalyzed coupling of a variety of 4-chlorocyclobutenones with 3-(tri-n-butylstannyl)-3-cyclobutene-1,2-dione 2-(ethylene acetal) and heating up to 70-100-degrees-C produces substituted benzocyclobutenedione monoacetals in good to excellent yields. Thia chemistry is presumed to proceed through palladium-catalyzed formation of a 3-(1-oxo-2-cyclobuten-4-yl)-3-cyclobutene-1,2-dione-2-(ethylene acetal) followed by a thermally induced ring opening to a dienyl ketene and subsequent six-electron electrocyclic ring closure and tautomerization. 2,3-Disubstituted 4-chlorocyclobutenones afford palladium intermediates which couple exclusively at the least-substituted allylic terminus. 2,3,4-Trisubstituted 4-chlorocyclobutenones have not been studied in detail; however, preliminary results suggest that regioselective allylic cross-coupling can be achieved. The methodology described provides an expedient and efficient route to previously difficult-to-prepare benzocyclobutenedione derivatives. These function as important synthetic intermediates in a variety of reactions developed in these and other laboratories.

  DOI：

  10.1021/jo00067a029