triethylamine; POCl3 in dichloromethane addn. of POCl3 to a soln. of amide in CH2Cl2, stirring at 0°C for30 min, addn. of a soln. of chromium complex and amine in CH2Cl2, stirr ing for 24 h at 20°C; flash column chromy. (SiO2, pentane, then pentane/CH2Cl2 3:1), recrystn.(CH2Cl2/Et2O, -20°C); elem. anal.;

1: triethylamine; POCl3 / dichloromethane 2: benzene View Scheme

in diethyl ether 24 h; Inert atmosphereSchlenk technique;