Facile One-Pot Synthesis of 2,1,3-Benzoxadiazole<i>N</i>-Oxide (Benzofuroxan) Derivatives Under Phase-Transfer Catalysis
作者:N. R. Ayyangar、S. Madan Kumar、K. V. Srinivasan
DOI:10.1055/s-1987-28023
日期:——
Several 2,1,3-benzoxadiazole N-oxide (benzofuroxan) derivatives are synthesized from the corresponding o-chloronitrobenzenes in a one-pot operation by stirring with sodium azide in dichloroethane in the presence of benzyl tributylammonium bromide as a phase-transfer catalyst. The moderate reaction conditions enable the isolation of the intermediate reactive azido compounds.
Synthesis of nitrophenyl and fluorophenyl azides and diazides by S
<sub>N</sub>
Ar under phase‐transfer or microwave irradiation: Fast and mild methodologies to prepare photoaffinity labeling, crosslinking, and click chemistry reagents
作者:Elisa Leyva、Johana Aguilar、Regina M. González‐Balderas、Sarai Vega‐Rodríguez、Silvia E. Loredo‐Carrillo
DOI:10.1002/poc.4171
日期:2021.5
(50°C to 70°C). These procedures could be applied in the preparation of other aryl azides. In the case of substituted pentafluoro benzene (pF), the type of products obtained in each reaction depends on the amount of sodium azide and the strength and position of electron‐withdrawing substituents (COH, COR, COOR, CN, NO2, or F). A discussion on the mechanisms and the products obtained in these SNAr reactions
介绍了两种快速温和的方法来制备硝基苯基和氟苯基叠氮化物。这些芳基叠氮化物被广泛用作交联,光亲和标记和点击化学试剂。取代的芳基叠氮化物是通过用相转移催化剂(PTC)(例如四氟硼酸四乙铵)(TEATFB)在卤代苯上进行S N Ar取代而制备的,该反应在相当温和的温度(25°C至70°C)下进行了数小时)。此外,还在稍高的温度(50℃至70℃)下在微波辐射下在数分钟内制备芳基叠氮化物。这些程序可用于制备其他芳基叠氮化物。在取代的五氟苯(pF),每个反应中获得的产物类型取决于叠氮化钠的量以及吸电子取代基(COH,COR,COOR,CN,NO 2或F)的强度和位置。讨论了在这些S N Ar反应中的机理和所获得的产物。