5H-2-(4-bromophenyl)-5-methyloxazol-4-one | 1221817-71-5

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 5H-2-(4-bromophenyl)-5-methyloxazol-4-one
• CAS: 1221817-71-5
• 化学式: C₁₀H₈BrNO₂
• 分子量: 254.083
• InChiKey: IEIGQEMDNFSLFR-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.14
• 重原子数：
  14.0
• 可旋转键数：
  1.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.2
• 拓扑面积：
  38.66
• 氢给体数：
  0.0
• 氢受体数：
  2.0

反应信息

• 作为反应物：
  描述：

  N-苯基马来酰亚胺 、 5H-2-(4-bromophenyl)-5-methyloxazol-4-one 在 1-(3,5-bis(trifluoromethyl)phenyl)-3-((1R,2R)-2-(pyrrolidin-1-yl)cyclohexyl)thiourea 、 sodium phosphate 作用下， 反应 6.17h， 以85%的产率得到(3aR,4R,7R,7aS)-4-(4-bromophenyl)-7-methyl-2-phenyltetrahydro-1H-4,7-epoxypyrrolo[3,4-c]pyridine-1,3,6(2H,3aH)-trione
  参考文献：
  名称：

  Highly Enantio- and Diastereoselective [4 + 2] Cycloaddition of 5H-oxazol-4-ones with N-Maleimides

  摘要：

  An organocatalytic asymmetric reaction between 5H-oxazol-4-ones and N-substituted maleimides is disclosed. Employing Takemoto's chiral tertiary amine-thiourea as the catalyst, [4 + 2] annulation reactions were performed with high chemoselectivity, leading to a series of biologically important chiral oxo-bridged piperidone-fused succinimides in good to excellent enantioselectivities (up to >99% ee) and >19:1 dr.

  DOI：

  10.1021/acs.joc.6b01451
• 作为产物：
  描述：

  对溴苯甲胺 、 2-溴丙酰溴 在 吡啶 、 potassium carbonate 作用下， 以 四氢呋喃 、 环戊基甲醚 为溶剂， 以37%的产率得到5H-2-(4-bromophenyl)-5-methyloxazol-4-one
  参考文献：
  名称：

  手性胍催化5H-恶唑-4-酮与醛的直接不对称羟醛反应

  摘要：

  开发了一种新的手性双环胍催化 5H-恶唑-4-酮与醛的直接催化醛醇反应。使用在适当位置带有羟基的双环胍，本醛醇反应以高对映选择性顺利进行，并且5H-恶唑-4-酮和醛的各种组合是适用的。该方法提供了在α-碳原子处带有手性四元立体中心的合成有用的α，β-二羟基羧酸盐。

  DOI：

  10.1021/ja101216x

文献信息

• Highly Stereoselective Synthesis of α-Alkyl-α-Hydroxycarboxylic Acid Derivatives Catalyzed by a Dinuclear Zinc Complex
  作者：Barry M. Trost、Keiichi Hirano

  DOI：10.1002/anie.201201116

  日期：2012.6.25

  dinuclear zinc–ProPhenol catalyst enables highly enantioselective nitro‐Michael reactions with oxazol‐4(5H)‐ones as nucleophilic substrates (see scheme, Nap=2‐naphthyl). This work highlights the utility of the ProPhenol family of ligands. The modular nature of these ligands proved crucial in the optimization of reaction conditions to achieve excellent stereoselectivities.

  双核锌-ProPhenol催化剂可与作为亲核底物的恶唑-4（5 H）-酮进行高度对映选择性的硝基-迈克尔反应（请参阅方案，Nap = 2-萘基）。这项工作突出了ProPhenol配体家族的实用性。这些配体的模块性质被证明对于优化反应条件以实现出色的立体选择性至关重要。
• Chemoselective Switch in the Asymmetric Organocatalysis of 5<i>H</i>-Oxazol-4-ones and<i>N</i>-Itaconimides: Addition-Protonation or [4+2] Cycloaddition
  作者：Bo Zhu、Richmond Lee、Jiangtao Li、Xinyi Ye、San-Ni Hong、Shuai Qiu、Michelle L. Coote、Zhiyong Jiang

  DOI：10.1002/anie.201507796

  日期：2016.1.22

  We report a synthetic strategy for a chemoselective switch and a diastereo‐divergent approach for the asymmetric reaction of 5H‐oxazol‐4‐ones and N‐itaconimides catalyzed by l‐tert‐leucine‐derived tertiary amine–urea compounds. The reaction was modulated to harness either tandem conjugate addition–protonation or [4+2] cycloaddition as major product with excellent enantio‐ and diastereoselectivities

  我们报告的化学选择性开关和用于5不对称反应中的非对映发散方法合成策略ħ -恶唑-4-酮和Ñ -itaconimides催化升-叔亮氨酸衍生的叔胺-尿素化合物。调节反应以利用串联共轭加成-质子化或[4 + 2]环加成为主要产物，具有出色的对映异构和非对映异构选择性。将对映体富集的环加成产物置于碱性硅胶试剂中，与在加成质子化条件下直接获得的产物相比，可生成非对映异构体，从而开辟了非对映异构路线，从而形成了1,3-叔-叔-季铵盐立体中心。量子化学研究进一步为[4 + 2]过程提供了立体化学分析，并提出了这种化学选择性开关的合理机制。
• Remote Construction of Chiral Vicinal Tertiary and Quaternary Centers by Catalytic Asymmetric 1,6‐Conjugate Addition of Prochiral Carbon Nucleophiles to Cyclic Dienones
  作者：Yuan Wei、Zunwu Liu、Xinxin Wu、Jie Fei、Xiaodong Gu、Xiaoqian Yuan、Jinxing Ye

  DOI：10.1002/chem.201503530

  日期：2015.12.21

  An unprecedented remote construction of chiral vicinal tertiary and quaternary centers by a catalytic asymmetric 1,6‐conjugate addition of prochiral carbon nucleophiles to cyclic dienones has been developed. Both 5H‐oxazol‐4‐ones and 2‐oxindoles were found to be very efficient carbon nucleophiles in this reaction at a remote position, giving products with excellent enantio‐ and diastereoselectivities

  通过将前手性碳亲核试剂催化不对称1,6-共轭加成到环状二烯酮上，已开发出前所未有的远程手性邻三级和四级中心结构。发现5 H-恶唑-4-酮和2-羟吲哚在该反应中都是非常有效的碳亲核试剂，使产物具有优异的对映异构和非对映异构选择性（ee高达99％  ee，dr> 19：1 dr 5 H-恶唑-4-和2-吲哚类化合物的ee最高为97％  ee和> 19：1 dr）。
• Highly enantioselective α-sulfenylation of 5H-oxazol-4-ones to N-(sulfanyl)succinimides
  作者：Mei Xu、Baokun Qiao、Shaobo Duan、Hongjun Liu、Zhiyong Jiang

  DOI：10.1016/j.tet.2014.09.037

  日期：2014.11

  An unprecedented asymmetric alpha-sulfenylation of 5H-oxazol-4-ones to N-(sulfanyl)succinimides has been established, to access various alpha-sulfenylated adducts with good to excellent enantioselectivities (86-95% ee) by utilizing a cinchona alkaloid-derived squaramide as catalyst. The conditions of this alpha-sulfenylation protocol simultaneously satisfy N-(arylthio)succinimides, N-(benzylthio)succinimides, and N-(alkylthio)succinimides by tuning the substituted groups of 5H-oxazol-4-ones on the 2-position as well as additives. (C) 2014 Elsevier Ltd. All rights reserved.
• Highly<i>Z</i>-Selective Asymmetric 1,4-Addition Reaction of 5<i>H</i>-Oxazol-4-ones with Alkynyl Carbonyl Compounds Catalyzed by Chiral Guanidines
  作者：Tomonori Misaki、Kei Kawano、Takashi Sugimura

  DOI：10.1021/ja200283n

  日期：2011.4.20

  An asymmetric I,4-addition reaction of 5H-oxazol-4-ones with alkynyl carbonyl compounds was developed, and, for the first time, high enantiomeric and geometric control was achieved to afford the thermodynamically unstable Z-isomer predominantly using chiral guanidine catalysts bearing a hydroxy group at the appropriate position. The method provides synthetically useful gamma-butenolide ester bearing a chiral quaternary stereogenic center.