(+/-)-4,4a,5,6,7,8-hexahydro-8,8-dimethyl-2(3H)-naphthalenone | 197460-66-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (+/-)-4,4a,5,6,7,8-hexahydro-8,8-dimethyl-2(3H)-naphthalenone
• 英文别名: rac-8,8-dimethyl-3,4,4a,5,6,7,8-heptahydronaphthalen-2-one；8,8-Dimethyl-3,4,4a,5,6,7-hexahydronaphthalen-2-one
• CAS: 197460-66-5
• 化学式: C₁₂H₁₈O
• 分子量: 178.274
• InChiKey: OESWKDVUINOYNJ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.8
• 重原子数：
  13
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  17.1
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  (+/-)-4,4a,5,6,7,8-hexahydro-8,8-dimethyl-2(3H)-naphthalenone 在 bis(dibenzylideneacetone)-palladium⁽⁰⁾ 2,6-二叔丁基-4-甲基吡啶 、 三苯胂 、 戴斯-马丁氧化剂 作用下， 以 N-甲基吡咯烷酮 、 二氯甲烷 为溶剂， 反应 13.62h， 生成 (2Z)-3-(3,4,5,6,7,8-hexahydro-8,8-dimethyl-2-naphthalenyl)-3-methyl-2-propenal
  参考文献：
  名称：

  Stereocontrolled Synthesis of 6-s-cis- and 6-s-trans-Locked 9Z-Retinoids by Hydroxyl-Accelerated Stille Coupling of (Z)-Tri-n-Butylstannylbut-2-en-1-ol and Bicyclic Dienyl Triflates

  摘要：

  Analogues of 9-cis-retinoic acid with locked 6-s-cis and 6-s-trans conformations have been stereoselectively synthesized using a Stille coupling reaction between bicyclic dienyl triflates (5 and 6, respectively) and (Z)-tributylstannylbut-2-en-1-ol (7) to stablish the Z geometry of the polyenic side chain. The mild conditions (25 degrees C, 30 min) of this coupling stand in contrast to the reluctance of the isomeric (E)-tributylstannylbut-2-en-1-ol (18) to react with triflates 5/6. The significant rate differences experimentally observed in Stille reactions between isomeric (Z)- and (E)-tri-n-butylstannylalkenols in favor of the former isomer, even with highly hindered alkenyl triflates, is ascribed to internal coordination of palladium to the heteroatom in the presumably rate-limiting transmetalation step. Dienals and trienals with an E geometry, which are not efficiently available by direct coupling of the corresponding triflates and E-stannanes, can in turn be obtained by isomerization of their Z-isomers.

  DOI：

  10.1021/jo9917588
• 作为产物：
  描述：

  2,2-二甲基环己酮 在 正丁基锂 、 sodium methylate 、 二异丙胺 作用下， 以 四氢呋喃 、 甲醇 、 正己烷 为溶剂， 反应 5.5h， 生成 (+/-)-4,4a,5,6,7,8-hexahydro-8,8-dimethyl-2(3H)-naphthalenone
  参考文献：
  名称：

  Stereocontrolled Synthesis of 6-s-cis- and 6-s-trans-Locked 9Z-Retinoids by Hydroxyl-Accelerated Stille Coupling of (Z)-Tri-n-Butylstannylbut-2-en-1-ol and Bicyclic Dienyl Triflates

  摘要：

  Analogues of 9-cis-retinoic acid with locked 6-s-cis and 6-s-trans conformations have been stereoselectively synthesized using a Stille coupling reaction between bicyclic dienyl triflates (5 and 6, respectively) and (Z)-tributylstannylbut-2-en-1-ol (7) to stablish the Z geometry of the polyenic side chain. The mild conditions (25 degrees C, 30 min) of this coupling stand in contrast to the reluctance of the isomeric (E)-tributylstannylbut-2-en-1-ol (18) to react with triflates 5/6. The significant rate differences experimentally observed in Stille reactions between isomeric (Z)- and (E)-tri-n-butylstannylalkenols in favor of the former isomer, even with highly hindered alkenyl triflates, is ascribed to internal coordination of palladium to the heteroatom in the presumably rate-limiting transmetalation step. Dienals and trienals with an E geometry, which are not efficiently available by direct coupling of the corresponding triflates and E-stannanes, can in turn be obtained by isomerization of their Z-isomers.

  DOI：

  10.1021/jo9917588

文献信息

• Stereochemistry of theRobinson Anellation: Studies on the Mode of Formation of the Intermediate Hydroxy Ketones
  作者：Cornelius Nussbaumer

  DOI：10.1002/hlca.19900730607

  日期：1990.9.19

  stereochemical outcome of the base-catalyzed cyclization of diketones 5–8 has been investigated under protic conditions (Scheme 3). The more stable trans-fused ketols are preferentially formed in kinetically controlled aldol reactions, when the incipient angular substituent R = H (6 10a) or CN (7 11a, 8a 12a). For R = Me (as in 5), axial attack of the side-chain enolate double bond on the ring CO group results

  二酮的碱催化环化反应的立体化学结果5 - 8已被质子条件（下研究方案3）。当初始的角取代基R = H（6 10a）或CN（7 11a，8a 12a）时，优先在动力学控制的羟醛反应中形成更稳定的反式醇。对于R =我（如5），在上的相当选择性形成环CO基团的结果侧链烯醇双键的轴向攻击顺- 9b上。 假定这些环化是由相对产物稳定性（类似产物的过渡态）和空间效应控制的。讨论了在这些环化反应中稠合（例如9）和桥联酮醇（例如13）形成之间的竞争。该顺式-融合（ '类固醇'）酮醇被容易地与他们的平衡反-counterparts（9B ⇄ 9A，10B ⇄ 10A，11B ⇄ 11A质子惰性条件下）（LDA，THF，0°的5摩尔％），从而，允许评估相对稳定性。
• Stereocontrolled Synthesis of 6-<i>s</i>-<i>cis</i>- and 6-<i>s</i>-<i>trans</i>-Locked 9<i>Z</i>-Retinoids by Hydroxyl-Accelerated Stille Coupling of (<i>Z</i>)-Tri-<i>n</i>-Butylstannylbut-2-en-1-ol and Bicyclic Dienyl Triflates
  作者：Beatriz Domínguez、Yolanda Pazos、Angel R. de Lera

  DOI：10.1021/jo9917588

  日期：2000.9.1

  Analogues of 9-cis-retinoic acid with locked 6-s-cis and 6-s-trans conformations have been stereoselectively synthesized using a Stille coupling reaction between bicyclic dienyl triflates (5 and 6, respectively) and (Z)-tributylstannylbut-2-en-1-ol (7) to stablish the Z geometry of the polyenic side chain. The mild conditions (25 degrees C, 30 min) of this coupling stand in contrast to the reluctance of the isomeric (E)-tributylstannylbut-2-en-1-ol (18) to react with triflates 5/6. The significant rate differences experimentally observed in Stille reactions between isomeric (Z)- and (E)-tri-n-butylstannylalkenols in favor of the former isomer, even with highly hindered alkenyl triflates, is ascribed to internal coordination of palladium to the heteroatom in the presumably rate-limiting transmetalation step. Dienals and trienals with an E geometry, which are not efficiently available by direct coupling of the corresponding triflates and E-stannanes, can in turn be obtained by isomerization of their Z-isomers.