1: C56H59N2O13P With N,O-bis(trimethylsilyl) trifluoroacetamide in dichloromethane T=0°C; 0.0333333 h; Inert atmosphere; 2: With 1,8-diazabicyclo[5.4.0]undec-7-ene in dichloromethane T=0°C; 0.333333 h; Inert atmosphere; 3: cyclohexylamine Further stages;