trans-2-vinyl-4methyltetrahydropyran | 81554-12-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 氧烷类
• 英文名称: trans-2-vinyl-4methyltetrahydropyran
• 英文别名: 4-methyl-2-vinyltetrahydro-2H-pyran
• CAS: 81554-12-3
• 化学式: C₈H₁₄O
• 分子量: 126.199
• InChiKey: JRQRZKSAUPVZCR-SFYZADRCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.99
• 重原子数：
  9.0
• 可旋转键数：
  1.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  9.23
• 氢给体数：
  0.0
• 氢受体数：
  1.0

反应信息

• 作为反应物：
  描述：

  trans-2-vinyl-4methyltetrahydropyran 在 Rh/Al₂O₃ 作用下， 以 正己烷 为溶剂， 生成 trans-2-ethyl-4-methyltetrahydropyran
  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-chloro-4-methyltetrahydropyran 在 Lindlar's catalyst 喹啉 、 氢气 作用下， 以 正己烷 为溶剂， 生成 trans-2-vinyl-4methyltetrahydropyran
  参考文献：
  名称：

  Conformational analysis. 42. Monosubstituted tetrahydropyrans

  摘要：

  DOI：

  10.1021/ja00377a015

文献信息

• Rhodium‐Catalyzed Cyclization of Terminal and Internal Allenols: An Atom Economic and Highly Stereoselective Access Towards Tetrahydropyrans
  作者：Johannes P. Schmidt、Bernhard Breit

  DOI：10.1002/ange.202009166

  日期：2020.12.21

  AbstractA comprehensive study of a diastereoselective Rh‐catalyzed cyclization of terminal and internal allenols is reported. The methodology allows the atom economic and highly syn‐selective access to synthetically important 2,4‐disubstituted and 2,4,6‐trisubstituted tetrahydropyrans (THP). Furthermore, its utility and versatility are demonstrated by a great functional‐group compatibility and the

  摘要报道了末端和内部联烯醇的非对映选择性 Rh 催化环化的综合研究。该方法允许原子经济且高度顺‐选择性获得合成上重要的2,4-二取代和2,4,6-三取代四氢吡喃（THP）。此外，其良好的官能团兼容性和 (−)-centrolobine 的对映选择性全合成证明了其实用性和多功能性。