Hydrogen-Bond-Directed Formal [5 + 1] Annulations of Oxindoles with Ester-Linked Bisenones Facile Access to Chiral Spirooxindole δ‑Lactone

Shuai Zhao, Jun-Bing Lin, Yuan-Yuan Zhao, Yong-Min Liang,* and Peng-Fei Xu

https://doi.org/10.1021/ol500547e