1: diethoxyphosphoryl-acetic acid ethyl ester With sodium hydride in tetrahydrofuran T=20°C; 0.333333 h; 2: (E)-(4R,5R)-5-hydroxy-2,4-dimethyl-5-(4-nitrophenyl)-pent-2-enal in tetrahydrofuran T=20°C; 0.5 h;