Supporting data for "EARTH-ABUNDANT TRANSITION METALS?CATALYZED ASYMMETRIC HYDROGENATION AND PROTOBORYLATION/[2 + 2] CYCLOADDITION"

Photocatalysis has attracted much attention recently due to its green energy and environmental remediation. The visible-light-induced [2 + 2] cycloaddition reaction is undoubtedly a direct and powerful tool for synthesizing cyclobutyl borates. Existing reports mostly use the precious metal Ir(III) as the photocatalyst. According to the concept of sustainability, this paper explores the visible-light-induced [2 + 2] cycloaddition reaction catalyzed by the base metal Cu to generate cyclobutyl borates. This reaction can use alkenes, alkynes, and cheap boric ester in a one-pot method to generate cyclobutyl borate products, avoiding separating the intermediate alkenyl boron compounds. At the same time, the modifiable biphosphine ligand binap provides the possibility of heterogeneity of the reaction.