1: C8H13Cl With [(R)-1,1'-binaphthyl-2,2'-diyldioxy]{bis[(S)-(1-phenylethyl)]amino}phosphine; copper(I) thiophene-2-carboxylate in dichloromethane T=-78 - 20°C; Inert atmosphere; 2: cyclohexylmagnesium halide in diethyl ether; dichloromethane T=-78°C; 2 h; Inert atmosphere; 3: With RuCl2(tricyclohexylphosphine)2(benzylidene) in dichloromethane T=20°C; 4 h; Inert atmosphere; optical yield given as percent eeregioselective reaction;