Ceric oxide-supported catalysts

A good number of alternative methods are also available in literature for the synthesis of 1,5-benzodiazepine derivatives involving the use of a variety of catalysts such magnesium oxide/ phosphorus oxychloride (MOPO) [1], ionic liquid (1,3-di-n-butylimidazolium bromide) [2], silica gel-supported cerium(lll) chloride/sodium iodide [3], Sc(OTf)3 [4], InCls [5], InBr3 [6], ceric ammonium nitrate (CAN) [7], 2,4,6-trichloro-l,3,5-triazine (TCT) [8,9], GaCl3 [10], and Zr0C2-8H20 [11] in the presence or absence of solvent(s) at room temperature. 

---