Zi-Biao Zhao, Lei Shi, Yaming Li, Fan-Jie Meng and Yong-Gui Zhou
Org. Biomol. Chem., 2019,17, 6364-6368
DOI:
10.1039/C9OB01158G,
Communication
Chiral ε-sultams, with their unique strain cyclic structure, are a type of molecule with important biological activities. A facile enantioselective aza-Friedel–Crafts reaction of seven-membered cyclic N-sulfonylimines with naphthols was developed with a cinchona alkaloid-based bifunctional organocatalyst, giving chiral ε-sultams with an enantiomeric excess of up to 92%.