Mild and Efficient Synthesis of Benzoxazoles, Benzothiazoles, Benzimidazoles, and Oxazolo[4,5-b]pyridines Catalyzed by Bi(III) Salts Under Solvent-Free Conditions
作者:Iraj Mohammadpoor-Baltork、Ahmad R. Khosropour、Seyedeh F. Hojati
DOI:10.1007/s00706-007-0655-9
日期:2007.7
A series of benzoxazoles, benzothiazoles, benzimidazoles, and oxazolo[4,5- b ]pyridines was efficiently synthesized from the reactions of o -aminophenols, o -aminothiophenol, o -phenylenediamines, and 2-amino-3-hydroxypyridine with orthoesters in the presence of catalytic amounts of Bi(III) salts, such as Bi( TFA )3, Bi(O Tf )3, and BiOClO4 · x H2O undersolvent-freeconditions. The remarkable features
一系列苯并恶唑,苯并噻唑,苯并咪唑,和恶唑并[4,5- b ]吡啶化合物是有效地从的反应合成 Ò 氨基苯酚, ö -aminothiophenol, ø 苯二胺类,和2-氨基-3-羟基吡啶与所述原酸酯存在催化量的Bi(III)盐,例如Bi( TFA )3,Bi(O Tf )3和BiOClO 4 · x H 2O在无溶剂条件下。该新方案的显着特征是高转化率,非常短的反应时间,在无溶剂条件下更干净的反应曲线,简单的操作步骤以及使用相对无毒的催化剂。
A Green and Efficient Protocol for the Synthesis of Quinoxaline, Benzoxazole and Benzimidazole Derivatives Using Heteropolyanion-Based Ionic Liquids: As a Recyclable Solid Catalyst
作者:Seyed Vahdat、Saeed Baghery
DOI:10.2174/1386207311316080004
日期:2013.8.1
green synthesis of 2,3-disubstitutedquinoxaline derivatives. These ionic liquids are in the solid state at room temperature and the synthesis is carried out via the one-pot condensation reaction of various o-phenylenediamine with 1,2-diketone derivatives. Benzoxazole and benzimidazole derivatives were also synthesized by these novel catalysts via the one-pot condensation from reaction orthoester with
synthesis of benzoxazoles and benzothiazoles via montmorillonite KSF clay catalyzed condensation reaction between 2-aminophenols or 2-aminothiophenols and β-diketones is reported. The efficiency of the reaction reflects from the wide substrate scope with electronic differentiation on aryls. The reaction is metal free and proceeds without the exclusion of air or moisture, and further the catalyst can
Application of nano SnO2 as a green and recyclable catalyst for the synthesis of 2-aryl or alkylbenzoxazole derivatives under ambient temperature
作者:SEYED MOHAMMAD VAHDAT、SHIMA GHAFOURI RAZ、SAEED BAGHERY
DOI:10.1007/s12039-013-0544-1
日期:2014.5
Application of nano SnO2 as an efficient and benign catalyst has been explored for the synthesis of 2-aryl or alkylbenzoxazole derivatives via condensation reaction of aldehyde with 2-aminophenol. The reactions proceed under heterogeneous and mild conditions in ethanol at room temperature to provide 2-aryl or alkylbenzoxazoles in high yields.
One-pot synthesis of benzoxazoles via the metal-free ortho-C–H functionalization of phenols with nitroalkanes
作者:Nicolai A. Aksenov、Alexander V. Aksenov、Oleg N. Nadein、Dmitrii A. Aksenov、Alexander N. Smirnov、Michael Rubin
DOI:10.1039/c5ra15128g
日期:——
PPA-activated nitroalkanes are employed in the design of a one-pot cascade transformation involvingortho-C–H functionalization, by Beckman rearrangement, and condensation to produce benzoxazoles and benzobisoxazoles directly from phenols.