A highly efficient ultrasound-promoted synthesis of 2,3-disubstituted benzo[b]furans via intramolecular C–C bond formation in ionic liquid[bmim]BF<sub>4</sub>at room temperature
作者:Nisha Yadav、Mohd. Kamil Hussain、Mohd. Imran Ansari、Puneet K. Gupta、Kanchan Hajela
DOI:10.1039/c2ra22355d
日期:——
An efficient ultrasound-promoted synthesis of 2,3-disubstitutedbenzo[b]furans in the ionic liquid [bmim]BF4 at room temperature is reported. 5-exo-dig carbanion–yne intramolecularcyclization is mediated using anhydrous K3PO4 as a mild, inexpensive base under atmospheric conditions giving the title benzo[b]furans in excellent yields. Ionic liquid [bmim]BF4 has been used both as a reaction medium,
据报道,在室温下,在离子液体[bmim] BF 4中超声有效地促进了2,3-二取代的苯并[ b ]呋喃的合成。在大气条件下,使用无水K 3 PO 4作为温和且廉价的碱,可以介导5 -exo-dig Carbanion-yne分子内环化反应,从而以优异的收率得到标题为benzo [ b ]呋喃的化合物。离子液体[bmim] BF 4既用作反应介质,又用作形成CC键的催化剂。