Synthesis of Spirocyclic Oxindole Dihydrothiophenes by DBU-Catalyzed [3 + 2] Annulation of Morita–Baylis–Hillman Carbonates with Isothiocyanates

Yuan-Yuan Zhao, Shuai Zhao, Ji-Kang Xie, Xiu-Qin Hu, and Peng-Fei Xu*

https://doi.org/10.1021/acs.joc.6b01315