trichlorophosphate in chloroform 3 h; Heating;

1: 1.) ClCO2Et, NEt3 / 1.) CHCl3, 1h, ice-bath, 2.) 1h, r.t. 2: 78 percent / m-CPBA / CHCl3 / 24 h 3: 50 percent / POCl3 / CHCl3 / 3 h / Heating View Scheme

1: 78 percent / m-CPBA / CHCl3 / 24 h 2: 50 percent / POCl3 / CHCl3 / 3 h / Heating View Scheme