1-hydroxybicyclo[2.2.2]octan-2-one | 116760-07-7

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 1-hydroxybicyclo[2.2.2]octan-2-one
• CAS: 116760-07-7
• 化学式: C₈H₁₂O₂
• 分子量: 140.182
• InChiKey: QDMAQBXZRMSIHA-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.4
• 重原子数：
  10
• 可旋转键数：
  0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.88
• 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：

  1-hydroxybicyclo[2.2.2]octan-2-one 在 吡啶 、 2,6-二甲基吡啶 、 四丁基氟化铵 、 sodium hydride 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 43.0h， 生成 1-Ethoxy-(E)-2-ethylidenebicyclo<2.2.2>octane
  参考文献：
  名称：

  Solvolysis of 2-methylene bicyclic bridgehead derivatives: a model for gradual variation of .pi.-conjugation in carbocations

  摘要：

  The rates of solvolysis in ethanol or 80% ethanol at 25-degrees-C have been determined on 2-methylenebicyclo[2.2.2]oct-1-yl triflate (4a), 2-methylenebicyclo[3.2.1]oct-1-yl triflate (5a), 2-methylenebicyclo[3.2.2]non-1-yl mesylate (6a), 2-methylenebicyclo[3.3.1]non-1-yl mesylate (7a-OMs) and heptafluorobutyrate (7a-OHFB), 1-chloro-2-methylenebicyclo[4.2.2]decane (8a), 2-methylenebicyclo[4.3.1]dec-1-yl trifluoroacetate (9a), and 4-methylene-3-homoadamantyl heptafluorobutyrate (10a) and on their corresponding parent 1-bicycloalkyl and 3-homoadamantyl derivatives 4b-10b containing the respective leaving group. The rate ratios for 4a/4b, 5a/5b, 10a/10b, 6a/6b, 7a/7b, 8a/8b, and 9a/9b are 10(-3.9), 10(-1.9), 10(-1.1), 10(0.8), 10(0.9) (for mesylate), 10(-0.2), and 10(0.7), respectively. A plot of the logarithms of the rate ratios against olefinic strain energies of their corresponding unsubstituted bridgehead olefins shows that the smaller the olefinic strain energy, the greater the rate ratio, providing a methodology to gradually change the conjugative ability of bridgehead carbocations. The enhancement of allylic conjugation with increasing skeletal flexibility has been further verified by the enhanced solvolysis rate of (E)-2-ethylidenebicyclo[3.2.2]non-1-yl mesylate ((E)-6e) relative to 6a by a factor of 259. A similar study on much more rigid (E)-2-ethylidenebicyclo[2.2.2]oct-1-yl triflate ((E)-4e) gave a (E)-4e/4a rate ratio of 6.3. AM1 semiempirical molecular orbital calculations on pertinent 2-methylene and (E)-2-ethylidene bridgehead carbocations and corresponding hydrocarbons (L = hydrogen) also supported the increase in the conjugation with increasing skeletal flexibility. The solvolysis products were solely bridgehead substitution products, no indication for the formation of bridgehead olefin via an S(N)1' mechanism having been obtained.

  DOI：

  10.1021/jo00027a050
• 作为产物：
  描述：

  1-methoxybicyclo[2.2.2]oct-5-en-2-one 生成 1-hydroxybicyclo[2.2.2]octan-2-one
  参考文献：
  名称：

  评估2-亚甲基和2-氧代取代基的π-共轭作用对双环桥头衍生物溶剂分解中碳正离子稳定性的影响

  摘要：

  与刚性较强的2-亚甲基双环[2.2.2]辛-1-基阳离子相比，初始的2-亚甲基双环[3.2.2]壬-1-基阳离子通过烯丙基结合稳定在4 kcal / mol。与此相反，在2-氧代双环[3.2.2]壬-1-基阳离子中未检测到由于羰基π-共轭引起的明显稳定，表明在叔α-酮基阳离子中π-共轭稳定的重要性不高。

  DOI：

  10.1016/s0040-4039(00)82470-3

文献信息

• Solvolyses of 2-Oxo Bridgehead Compounds:  A Critical Examination of π-Conjugative Stabilization of α-Carbonyl Carbocations
  作者：Ken'ichi Takeuchi、Yasushi Ohga、Masayasu Yoshida、Keizo Ikai、Tadashi Shibata、Midori Kato、Akio Tsugeno

  DOI：10.1021/jo970454n

  日期：1997.8.1

  The methodology of changing ring flexibility to detect the pi-conjugative stabilization of bridgehead carbocations has been applied to eight 2-oxo (X = O) bridgehead carbocations. On the basis of the solvolytic behavior observed in kinetics and product analyses, the eight 2-oxo bridgehead substrates were classified into three categories: three substrates solvolyzing without ion-pair return that leads to primary isomers (class A), three substrates that form primary isomers by ion-pair return during solvolysis (class B), and two substrates that undergo solvent addition to the carbonyl group to form hemiacetals during solvolysis (class C). It was concluded that the substrates of class C could not be used for the present purpose. Essentially constant ethanolysis rate ratios, k(X = O)/k(X = H-2), of 10(-8.2)-10(-8.7) at 25 degrees C were obtained between four 2-oxo substrates in classes A and B and the corresponding parent unsubstituted ones. The result was interpreted to suggest that the pi-conjugative stabilization of tertiary alpha-carbonyl carbocations is negligibly small, if present. Slightly more negative k(X = O)/k(X = H-2) values of 10(-9.7) and 10(-9.2) for highly flexible bicyclo[4.2.2]dec-1-yl and bicyclo[4.3.1]dec-l-yl systems, respectively, were attributed to complex conformations in the ground and incipient carbocations. PM3 calculations on some 2-methylene and 2-oxo bridgehead carbocations supported the experimental results. Comparison of the solvolysis rates of 1,1,3,3-tetramethyl-2-oxobutyl mesylate with those of 1,1,3,3-tetramethylbutyl mesylate estimated from the rates of the corresponding chloride also failed to support the pi-conjugative stabilization of alpha-carbonyl carbocations.
• Selective oxidation of tertiary-secondary vic-diols to α-hydroxy ketones by dioxiranes
  作者：Ruggero Curci、Lucia D'Accolti、Antonia Detomaso、Caterina Fusco、Ken'ichi Takeuchi、Yasushi Ohga、Philip E. Eaton、Yu Chi Yip

  DOI：10.1016/0040-4039(93)88085-w

  日期：1993.7

  Isolated dimethyldioxirane (1a) and methyl(trifluoromethyl)dioxirane (1b) efficiently afford the conversion of bicyclic diols bicyclo(2.2.2]octane-1,2-diol (2) and (+)-pinane-2,3-diol (6), of tricyclic diols adamantane-1,2-diol (3), homoadamantane-3,4-diol (4), and of homopentaprismane-3,4-diol (5) into the corresponding alpha-hydroxy ketones in high yields and under mild conditions. In the oxidation of (+)-pinane-2,3-diol (6), (-)-2-hydroxy-3-pinanone (11) is obtained in optical yield >97% with retention of configuration.
• TAKEUCHI, KENICHI;AKIYAMA, FUMIO;IKAI, KEIZO;SHIBATA, TADASHI;KATO, MIDOR+, TETRAHEDRON LETT., 29,(1988) N 8, 873-876
  作者：TAKEUCHI, KENICHI、AKIYAMA, FUMIO、IKAI, KEIZO、SHIBATA, TADASHI、KATO, MIDOR+

  DOI：——

  日期：——
• OVEREXPRESSION OF GENES THAT IMPROVE FERMENTATION IN YEAST USING CELLULOSIC SUBSTRATES
  申请人：Alvizo Oscar

  公开号：US20140322776A1

  公开（公告）日：2014-10-30

  The invention relates to recombinant yeast host cells that overexpress proteins to improve glucose utilization, pentose sugar utilization and/or production of a fermentation product in a fermentation reaction.
• Solvolysis of 2-methylene bicyclic bridgehead derivatives: a model for gradual variation of .pi.-conjugation in carbocations
  作者：Kenichi Takeuchi、Toshikazu Kitagawa、Yasushi Ohga、Masayasu Yoshida、Fumio Akiyama、Akio Tsugeno

  DOI：10.1021/jo00027a050

  日期：1992.1

  The rates of solvolysis in ethanol or 80% ethanol at 25-degrees-C have been determined on 2-methylenebicyclo[2.2.2]oct-1-yl triflate (4a), 2-methylenebicyclo[3.2.1]oct-1-yl triflate (5a), 2-methylenebicyclo[3.2.2]non-1-yl mesylate (6a), 2-methylenebicyclo[3.3.1]non-1-yl mesylate (7a-OMs) and heptafluorobutyrate (7a-OHFB), 1-chloro-2-methylenebicyclo[4.2.2]decane (8a), 2-methylenebicyclo[4.3.1]dec-1-yl trifluoroacetate (9a), and 4-methylene-3-homoadamantyl heptafluorobutyrate (10a) and on their corresponding parent 1-bicycloalkyl and 3-homoadamantyl derivatives 4b-10b containing the respective leaving group. The rate ratios for 4a/4b, 5a/5b, 10a/10b, 6a/6b, 7a/7b, 8a/8b, and 9a/9b are 10(-3.9), 10(-1.9), 10(-1.1), 10(0.8), 10(0.9) (for mesylate), 10(-0.2), and 10(0.7), respectively. A plot of the logarithms of the rate ratios against olefinic strain energies of their corresponding unsubstituted bridgehead olefins shows that the smaller the olefinic strain energy, the greater the rate ratio, providing a methodology to gradually change the conjugative ability of bridgehead carbocations. The enhancement of allylic conjugation with increasing skeletal flexibility has been further verified by the enhanced solvolysis rate of (E)-2-ethylidenebicyclo[3.2.2]non-1-yl mesylate ((E)-6e) relative to 6a by a factor of 259. A similar study on much more rigid (E)-2-ethylidenebicyclo[2.2.2]oct-1-yl triflate ((E)-4e) gave a (E)-4e/4a rate ratio of 6.3. AM1 semiempirical molecular orbital calculations on pertinent 2-methylene and (E)-2-ethylidene bridgehead carbocations and corresponding hydrocarbons (L = hydrogen) also supported the increase in the conjugation with increasing skeletal flexibility. The solvolysis products were solely bridgehead substitution products, no indication for the formation of bridgehead olefin via an S(N)1' mechanism having been obtained.