Visible-Light-Induced Three-Component Reactions of α-Diazoesters, Indazoles and Cyclic Ethers

An efficient method was developed for construction of N-short-chain ether attached carbonyl group-substituted indazoles. The visible-light-induced three-component reactions of α-diazoesters, indazoles and cyclic ethers, under extremely mild conditions, led to the corresponding mixture of N1 and N2 short-chain ether substituted indazoles in good to excellent yields.