A method for the facile synthesis of valuable 3‐selenospiro[4,5]decatrienones via CuBr2‐catalyzed three‐component reaction of N‐(4‐methoxyaryl)‐N‐methyl‐3‐phenylpropiolamide, Se powder, and boronic acids under air is disclosed. This method feature wide substrate scope, good functional group tolerance, employing earth‐abundant metal as the catalyst and green air as the oxidant, which increase its practicability. Abstract Herein, a method for the assembly of biologically valuable 3‐selenospiro[4,5]decatrienones through CuBr2‐catalyzed...