Regiospecific β-lactam ring-opening/recyclization reactions of N-aryl-3-spirocyclic-β-lactams catalyzed by a Lewis–Brønsted acids combined superacid catalyst system: a new entry to 3-spirocyclicquinolin-4(1H)-ones

Yinqiao Hu, Xiaolan Fu, Badru-Deen Barry, Xihe Bi, Dewen Dong
  • Chemical Communications, January 2012, Royal Society of Chemistry
  • DOI: 10.1039/c1cc15881c