Efficient Solvent-free Synthesis of Spiro Heterobicyclic Derivatives with Boric Acid as Catalyst
XU Zhaohui,LIU Deyong,TU Yuanhong
Chinese Journal of Applied Chemistry . 2015, (9): 999 -1004 .  DOI: 10.11944/j.issn.1000-0518.2015.09.150038