8-(3-nitrophenyl)-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazin-1-one | 1311968-79-2

• 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: 8-(3-nitrophenyl)-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazin-1-one
• CAS: 1311968-79-2
• 化学式: C₁₅H₉N₃O₅
• 分子量: 311.254
• InChiKey: IATKHUUFFFFFBZ-UHFFFAOYSA-N

物化性质

• 熔点：
  220 °C(Solvent: Dichloromethane ; Pentane)
• 沸点：
  497.6±55.0 °C(Predicted)
• 密度：
  1.62±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  23
• 可旋转键数：
  1
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.07
• 拓扑面积：
  97
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  8-(3-nitrophenyl)-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazin-1-one 在 tetraphosphorus decasulfide 作用下， 以 5,5-dimethyl-1,3-cyclohexadiene 为溶剂， 反应 48.0h， 以64%的产率得到8-(3-nitrophenyl)-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazine-1-thione
  参考文献：
  名称：

  Synthesis of sulfur containing analogues of the soluble guanylate cyclase inhibitor 8-bromo-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazin-1-one NS2028

  摘要：

  Sulfur analogues of the soluble guanylate cyclase (sGC) inhibitor NS2028 la are synthesized. Treating 8-bromo-2H-benzo[b][1,4]oxazin-3(4H)-one oxime (6) with 1,1'-thiocarbonyldiimidazole (1.1 equiv) gave the carbamothioate 8-bromo-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazine-1-thione (3a) in 83% yield. Alternatively reacting NS2028 1a with P2S5 (0.5 equiv) affords the carbamothioate 3a in 80% yield. Similar treatment of 8-aryl substituted NS2028 analogues 1b-d with P2S5 gave the carbamothioates 3b-d in 64-91% yields. Although quite stable, the carbamothioates 3a-d could be thermally isomerized in the presence of Cu (10 mol X) to afford the thiocarbamates 4a-d in high yields. Interestingly, in the case of carbamothioate 3a Pd and In metals also facilitated the isomerization. Furthermore, treatment of the thiocarbamates 4a-d with P2S5 (0.5 equiv) affords the carbamodithioates 5a-d in 72-89% yields. All new compounds are fully characterized including single crystal X-ray data for carbamothioate 3a and thiocarbamate 4a. Finally, a mechanism is proposed for the carbamothioate to thiocarbamate isomerization. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2011.05.071
• 作为产物：
  描述：

  3-硝基苯硼酸 、 4H-8-溴-1,2,4-噁二唑(3,4-d)苯并(b)(1,4)噁嗪-1-酮 在 palladium diacetate 、 N,N-二异丙基乙胺 作用下， 以 1,4-二氧六环 、 水 为溶剂， 反应 0.33h， 以26%的产率得到8-(3-nitrophenyl)-4H-[1,2,4]oxadiazolo[3,4-c][1,4]benzoxazin-1-one
  参考文献：
  名称：

  Suzuki–Miyaura reactions of the soluble guanylate cyclase inhibitor NS2028: a non-product specific route to C-8 substituted analogues

  摘要：

  Both soluble guanylate cyclase (sGC) inhibitors ODQ 1 and NS2028 2 are synthesized via improved protocols. In the former case treating 3,4-dihydroquinoxalin-2(1H)-one oxime 8, which can be prepared in two steps from 1,2-benzenediamine, with 1,1'-carbonyldiimidazole (CDI) gives the dihydro-ODQ 10 that in the presence of KMnO4 oxidises to give ODQ 1 in an overall yield of 46% starting from 1,2-benzenediamine. In the latter case, the synthesis affords NS2028 2 from 2-amino-4-bromophenol 3 in three steps with an overall yield of 85% and avoids the need for chromatography. Furthermore, Suzuki-Miyaura reaction conditions are described that enable the preparation of 8-aryl and 8-heteroaryl derivatives of NS2028 directly from NS2028 2. Finally, demethylation of the 8-(methoxyphenyl) substituted analogues afforded the 8-(hydroxyphenyl) derivatives 40-42. All new products are fully characterised. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2011.04.003