Synthesis of optically active trifluoromethyl-substituted 2,3-dihydroimidazo[2,1- b ]oxazoles
作者:Grzegorz Mlostoń、Aneta Wróblewska、Heinz Heimgartner
DOI:10.1016/j.jfluchem.2016.07.014
日期:2016.9
The 2-unsubstituted imidazole N-oxides with a 3,3,3-trifluoro-2-hydroxypropyl group at N(1) in the presence of acetic anhydride undergo cyclization via the intramolecular nucleophilic attack of the hydroxyl group onto C(2) of the imidazole ring to give trifluoromethylated derivatives of 2,3-dihydroimidazo[2,1-b]oxazoles. This method, starting with enantiopure substrates, allows the preparation of enantiopure
在乙酸酐存在下,在N(1)上具有3,3,3-三氟-2-羟丙基的2-未取代的咪唑N-氧化物通过分子内的亲核攻击羟基在C(2)上进行环化咪唑环得到2,3-二氢咪唑并[2,1- b ]恶唑的三氟甲基化衍生物。此方法从对映纯底物开始,可以一锅法制备对映纯产品。