copper(I) thiophene-2-carboxylate; O,O’-(S)-1,1’-(dinaphthyl-2,2’-diyl)-N,N’-di-(S,S)-1-(2-methoxyphenyl)ethylphosphoramidite in diethyl ether; dichloromethane T=-78°C; 4.5 h; Inert atmosphere; optical yield given as percent eeenantioselective reaction;