the National Natural Science Foundation of China(Nos.21890723 and 21921002);the Science and Technology Department of Sichuan Province(Nos.2021YJ0561)for financial support.
An efficient synthesis of chiral benzannulated spiroketals via catalytic asymmetric[3+2]cycloaddition of exocyclic enol ethers with p-quinones was achieved.The transformation was enabled by a chiral N,N′-dioxides/Tm^...