2-tert-butyl-2,3-dihydro-6-methyl-4H-pyran-4-one

• 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-tert-butyl-2,3-dihydro-6-methyl-4H-pyran-4-one
• 英文别名: 2-tert-butyl-6-methyl-2H-pyran-4(3H)-one；2-Tert-butyl-6-methyl-2,3-dihydropyran-4-one
• 化学式: C₁₀H₁₆O₂
• 分子量: 168.236
• InChiKey: MZAOSJBQNOUSTP-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  12
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.7
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  正丁基锂 、 2-tert-butyl-2,3-dihydro-6-methyl-4H-pyran-4-one 在 copper(l) iodide 作用下， 生成 2β-n-butyl-6α-tert-butyl-tetrahydro-2α-methyl-4H-pyran-4-one
  参考文献：
  名称：

  Photoadditions and Dialkylcuprate Additions to 2-tert-Butyl-2,6-dimethyl-1,3-dioxin-4-one and Related Heterocycles. Experimental, Ab Initio Theoretical, and X-Ray Structural Studies of Facial Selectivity and Enone Pyramidalization

  摘要：

  Preparation and ground-state reactions of 1,3-dioxinone(1), alpha,beta-unsaturated delta-lactone 4, and dihydropyranone 5 are reported. These three substrates have identical alkyl substituents but differ in the number and placement of oxygen atoms in the heterocycle. Reaction of 1 or 4 with (n-Bu)(2)CuLi leads to exclusive addition on the top face (side opposite the tert-butyl group) of the substrate while addition to 5 gives a 50:50 mixture of diastereomers. Pyramidalizations of the enone portions of 1, 4, and 5 (along with 2-cyclohexenone) have been predicted using ab initio Hartree-Fock (HF) methods with a split-valence plus polarization basis set, 6-31G*, and with the inclusion of electron correlation by Moller-Plesset perturbation theory (MP2). These predictions have been compared with the results of X-ray crystal structure determinations on related heterocycles which were present in the Cambridge Crystallographic Database. Both theoretical methods indicate that the extent of pyramidalization decreases in the following order: 1,3-dioxinones > alpha,beta-unsaturated delta-lactones > dihydropyranones > 2-cyclohexenones. This trend suggests that the facial selectivity observed in the ground-state reactions of 1, 4, and 5 is related to the extent of pyramidalization in the enone portion of these substrates. Photoaddition reactions of 1 with various cycloalkenes are also reported. The exclusive or major product in these reactions results from attack on the bottom face of 1. Thus, substrate 1 allows exclusive entry of ground-state reactants on the top face, but excited-state reactions occur exclusively or primarily on the bottom face.

  DOI：

  10.1021/ja00087a018
• 作为产物：
  描述：

  在 三氟乙酸 作用下， 以 二氯甲烷 为溶剂， 生成 2-tert-butyl-2,3-dihydro-6-methyl-4H-pyran-4-one
  参考文献：
  名称：

  钴催化的烯丙基硅烷和烯丙基硼酸酯的1,4-羟基乙烯基化反应，用于合成羟基官能化的1,4-二烯

  摘要：

  烯丙基三甲基硅烷和烯丙基频哪醇硼酸酯与对称和不对称的1,3-二烯的钴（I）催化的1,4-氢乙烯基化反应为原位烯丙基硼化或路易斯酸诱导的烯丙基化反应（使用相应的烯丙基硅烷）生成了结构单元衍生品。这些三组分反应的产物是可用于吡喃酮合成的羟基官能化的1，4-二烯。通过首先进行烯丙基化，然后进行钴催化的1，4-氢乙烯基化来合成羟基官能化的1，4-二烯的替代反应顺序也是可能的。因此，可以通过两种方法以收敛的方式产生多官能化的复杂结构。

  DOI：

  10.1021/jo100951d

表征谱图