polymer-bound N-hydroxybenzenesulfonamide; sodium methylate in tetrahydrofuran; methanol T=20°C; Angeli-Rimini's reaction; 7 h;

1: With 4-methyl-morpholine; 1-propanephosphonic acid cyclic anhydride in ethyl acetate; acetonitrile T=0°C; 0.25 h; 2: With hydroxylamine hydrochloride in ethyl acetate; acetonitrile Ultrasonication;

4-methyl-morpholine; 1-propanephosphonic acid cyclic anhydride in tetrahydrofuran T=0°C; Lossen rearrangement; 0.5 h;