2-methyl-5-(3'-chloropropyl)oxazole | 146941-12-0

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 2-methyl-5-(3'-chloropropyl)oxazole
• 英文别名: 5-(3-chloropropyl)-2-methyloxazole；5-(3-Chloropropyl)-2-methyl-1,3-oxazole
• CAS: 146941-12-0
• 化学式: C₇H₁₀ClNO
• mdl: MFCD19235568
• 分子量: 159.615
• InChiKey: TUPVVXACFPPBCR-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  10
• 可旋转键数：
  3
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.571
• 拓扑面积：
  26
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2-methyl-5-(3'-chloropropyl)oxazole 在 sodium carbonate 作用下， 反应 12.0h， 以62%的产率得到2-methyl-5-(3'-hydroxypropyl)oxazole
  参考文献：
  名称：

  Oxazole activation for azomethine ylide trapping: singly and doubly tethered substrates

  摘要：

  Bicyclic oxazolium salts 18, 24, 37, and 44 can be generated from tethered haloalkyloxazoles by internal alkylation. Reductive alkylation of the oxazolium salts using CsF/PhSiH3 converts the salts initially into the corresponding 4-oxazoline derivatives. Subsequent electrocyclic ring opening generates stabilized azomethine ylides that can be trapped by suitable dipolarophiles. Intermolecular dipole trapping followed by DDQ oxidation affords the ring-fused pyrroles 22 and 26. When tethered alkynoates are used for internal dipole trapping, the adducts 38 and 45 can be obtained by a similar reductive activation sequence, followed by DDQ workup. Effective procedures for the internal oxazole N-alkylation step are described using an acetonitrile-trifluoroethanol solvent system. Also, an improved method for the generation of the dichlorocerium derivative of ethyl propiolate and intermolecular trapping by an aldehyde is reported.

  DOI：

  10.1021/jo00058a010
• 作为产物：
  描述：

  5-氯-1-重氮基-2-戊酮 、 乙腈 在 三氟化硼乙醚 作用下， 反应 1.0h， 以82%的产率得到2-methyl-5-(3'-chloropropyl)oxazole
  参考文献：
  名称：

  Oxazole activation for azomethine ylide trapping: singly and doubly tethered substrates

  摘要：

  Bicyclic oxazolium salts 18, 24, 37, and 44 can be generated from tethered haloalkyloxazoles by internal alkylation. Reductive alkylation of the oxazolium salts using CsF/PhSiH3 converts the salts initially into the corresponding 4-oxazoline derivatives. Subsequent electrocyclic ring opening generates stabilized azomethine ylides that can be trapped by suitable dipolarophiles. Intermolecular dipole trapping followed by DDQ oxidation affords the ring-fused pyrroles 22 and 26. When tethered alkynoates are used for internal dipole trapping, the adducts 38 and 45 can be obtained by a similar reductive activation sequence, followed by DDQ workup. Effective procedures for the internal oxazole N-alkylation step are described using an acetonitrile-trifluoroethanol solvent system. Also, an improved method for the generation of the dichlorocerium derivative of ethyl propiolate and intermolecular trapping by an aldehyde is reported.

  DOI：

  10.1021/jo00058a010

文献信息

• A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles
  作者：Weisen Yang、Rongli Zhang、Feiyan Yi、Mingzhong Cai

  DOI：10.1021/acs.joc.7b00386

  日期：2017.5.19

  heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminal alkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine–gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can

  通过使用固定化MCM-41的膦-金（I）络合物作为催化剂和8-甲基喹啉，实现了末端炔烃，腈和氧原子的第一个异质金（I）催化环化[2 + 2 + 1]在温和的条件下使用N-氧化物作为氧化剂，可以在宽范围的底物范围内以良好或优异的收率产生各种2,5-二取代的恶唑。通过简单过滤反应溶液，可以轻松回收新的多相金（I）催化剂，并循环至少八次，而不会明显降低活性。