N-Heterocyclic Carbene-Catalyzed   Atom-Economical and Enantioselective Construction of the C−S Bond: Asymmetric   Synthesis of Functionalized Thiochromans

Hong Lu, Jia-Lu Zhang, Jin-Yu Liu, Hong-Yu   Li, and Peng-Fei Xu*,

https://doi.org/10.1021/acscatal.7b02651