2-Butyloxycarbonyl-3,4-dimethyl-5,6-dihydro-2H-pyran | 19353-17-4

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃
• 英文名称: 2-Butyloxycarbonyl-3,4-dimethyl-5,6-dihydro-2H-pyran
• 英文别名: 4,5-dimethyl-3,6-dihydro-2H-pyran-2-carboxylic acid butyl ester；butyl 4,5-dimethyl-3,6-dihydro-2H-pyran-2-carboxylate
• CAS: 19353-17-4
• 化学式: C₁₂H₂₀O₃
• 分子量: 212.289
• InChiKey: KPEPWLBBARBODG-UHFFFAOYSA-N

物化性质

• 沸点：
  100-101 °C
• 密度：
  1.0049 g/cm3

计算性质

• 辛醇/水分配系数(LogP)：
  1.8
• 重原子数：
  15
• 可旋转键数：
  5
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  35.5
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  2-Butyloxycarbonyl-3,4-dimethyl-5,6-dihydro-2H-pyran 在 palladium on activated charcoal 硫酸 、 氢气 作用下， 以 甲醇 为溶剂， 反应 4.0h， 生成 r-2-carbomethoxy-t-4,t-5-dimethyltetrahydropyran
  参考文献：
  名称：

  Carbon-13 NMR spectra of saturated heterocycles: XI—Tetrahydropyrans (oxanes)

  摘要：

  AbstractThe 13C NMR spectra of 62 oxanes (tetrahydropyrans) with and without methyl substituents at various ring positions, some of them bearing in addition (or instead) ethyl, vinyl, ethynyl, carbomethoxy and methylol substituents at C‐2, have been recorded, and the 294 resulting chemical shifts have been correlated by multiple linear regression analysis. Axial and equatorial α‐, β‐, γ‐, δ‐, gem‐ and vic‐parameters for shifts caused by methyl groups at all ring positions, and similar parameters for Et,—CHCH2,—CCH, CO2Me and CH2OH groups at C‐2, are reported. Standard deviations of the parameters are, in most cases, within 0.3 ppm and the agreement of calculated and experimental shifts is excellent. This is probably the largest parameter set of this type extant. 13C NMR spectra of a number of additional substituted tetrahydropyrans, and of 3,6‐dihydro‐2H‐pyrans and 3,4‐dihydro‐2H‐pyrans, are tabulated and discussed.

  DOI：

  10.1002/omr.1270210205
• 作为产物：
  描述：

  2,3-二甲基-1,3-丁二烯 、 乙醛酸正丁酯 在 对苯二酚 作用下， 反应 8.0h， 生成 2-Butyloxycarbonyl-3,4-dimethyl-5,6-dihydro-2H-pyran
  参考文献：
  名称：

  Carbon-13 NMR spectra of saturated heterocycles: XI—Tetrahydropyrans (oxanes)

  摘要：

  AbstractThe 13C NMR spectra of 62 oxanes (tetrahydropyrans) with and without methyl substituents at various ring positions, some of them bearing in addition (or instead) ethyl, vinyl, ethynyl, carbomethoxy and methylol substituents at C‐2, have been recorded, and the 294 resulting chemical shifts have been correlated by multiple linear regression analysis. Axial and equatorial α‐, β‐, γ‐, δ‐, gem‐ and vic‐parameters for shifts caused by methyl groups at all ring positions, and similar parameters for Et,—CHCH2,—CCH, CO2Me and CH2OH groups at C‐2, are reported. Standard deviations of the parameters are, in most cases, within 0.3 ppm and the agreement of calculated and experimental shifts is excellent. This is probably the largest parameter set of this type extant. 13C NMR spectra of a number of additional substituted tetrahydropyrans, and of 3,6‐dihydro‐2H‐pyrans and 3,4‐dihydro‐2H‐pyrans, are tabulated and discussed.

  DOI：

  10.1002/omr.1270210205

文献信息

• Enantioselective glyoxylate-ene reactions catalysed by (salen)chromium(III) complexes
  作者：Wojciech Chaładaj、Piotr Kwiatkowski、Jakub Majer、Janusz Jurczak

  DOI：10.1016/j.tetlet.2007.01.104

  日期：2007.3

  enantioselective carbonyl-ene reaction of alkyl glyoxylates with various 1,1-disubstituted olefins, catalysed by chiral (salen)Cr(III)BF4 complexes, has been studied. We found that a chromium complex bearing adamantyl substituents at the 3,3′-positions of the salicylidene moiety catalysed the reaction with much greater selectively than the classic Jacobsen-type catalyst. The reaction proceeded effectively

  研究了手性（salen）Cr（III）BF 4配合物催化的乙醛酸烷基酯与各种1,1-二取代烯烃的对映选择性羰基-烯反应。我们发现，在水杨叉基部分的3,3'-位置带有金刚烷基取代基的铬络合物催化反应的选择性要比经典的雅各布森型催化剂高得多。在2 mol％的催化剂存在下，在可接受的收率和59-92％ee的条件下，反应可在不苛刻的条件下有效地进行。