Triflic Acid-Catalyzed Tandem Reactions of Cyclopropyl Alcohols with Sulfonamides for the Synthesis of Pyrrolidines
Zhang Xiaoxiang, Sun Xiaoping, Rao Weidong
Chin. J. Org. Chem. . 2015, (7): 1500 -1505 .  DOI: 10.6023/cjoc201501036