1: in diethyl ether; dichloromethane T=-78°C; 0.025 h; Inert atmosphereCooling with ice; 2: With ammonium chloride in diethyl ether; dichloromethane 0.25 h;

1: With trimethylaluminum; zinc in tetrahydrofuran T=20°C; 4 h; 2: With hydrogenchloride 1 h; Heating; Title compound not separated from byproducts;

1: Methyltriphenylphosphonium bromide With potassium tert-butylate in diethyl ether 0.25 h; Heating; 2: Lajoie's serine aldehyde in tetrahydrofuran T=50°C; 0.166667 h; 3: With hydrogenchloride 1 h; Heating; Title compound not separated from byproducts;

1: With trimethylaluminum; zinc in tetrahydrofuran T=20°C; 4 h; 2: With hydrogenchloride 1 h; Heating; Title compound not separated from byproducts;

1: Methyltriphenylphosphonium bromide With potassium tert-butylate in diethyl ether 0.25 h; Heating; 2: Lajoie's serine aldehyde in tetrahydrofuran T=50°C; 0.166667 h; 3: With hydrogenchloride 1 h; Heating; Title compound not separated from byproducts;