An Efficient and Practical Synthesis of Benzoxazoles from Acyl Chlorides and 2-Aminophenols Catalyzed by Lewis Acid In(OTf)3 under Solvent-Free Reaction Conditions
作者:Bo Wang、Yicheng Zhang、Pinhua Li、Lei Wang
DOI:10.1002/cjoc.201090287
日期:2010.9
Benzoxazole derivatives have been prepared through the reaction of substituted 2‐aminophenols and acyl chlorides in the presence of catalytic amount of In(OTf)3under solvent‐free reaction conditions in good to excellent yields. The method is simple, convenient, environmental‐friendly, efficient and practical.
Trois nouvelles voies de synthèse des dérivés 1,3-azoliques sous micro-ondes
作者:Khalid Bougrin、André Loupy、Mohamed Soufiaoui
DOI:10.1016/s0040-4020(98)00431-1
日期:1998.7
Three new ways to synthesize 1,3 - azoles derivatives on mineral supports using or or by fusion “in dry media” are described. The reactions are activated under microwave irradiation in a monomode Synthewave 402 reactor. The reaction times are considerably shortened and the products are obtained in higher yields and better purity, than compared to conventional heating.
demonstrated broad substrate scope and good compatibility of functional groups. 2-Aryl benzothiazole and 2-aryl benzoimidazole could be smoothly assembled in the same manner. On the basis of preliminary mechanisticstudies, base initiated and aromatization driven β-carbon elimination was considered to be the key step for the formation of 2. This reaction offers an alternative, facile, and sustainable route to