1: phenyllithium; carbonic acid 5-tert-butoxycarbonyloxy-2-formyl-4-methoxy-phenyl ester tert-butyl ester in tetrahydrofuran; diethyl ether T=-30 - 0°C; 1 h; 2: vinyl-magnesium bromide in tetrahydrofuran; diethyl ether T=-78 - 20°C;