1: in chloroform 1 h; 2: With sodium acetate; acetic anhydride 2 h; Reflux;

1: tetrahydrofuran / 24 h / |Reflux 2: tetrahydrofuran / 2 h / |Reflux 3: triethylamine; thionyl chloride / tetrahydrofuran / 6 h / |Reflux View Scheme

thionyl chloride; triethylamine in tetrahydrofuran 6 h; Reflux;