1: With dicyclohexyl-carbodiimide in acetonitrile T=0 - 20°C; 2: With benzotriazol-1-ol in acetonitrile T=0 - 20°C; 3: With hydrazine hydrate in acetonitrile T=0 - 20°C; 5 h;

hydrazine hydrate in acetonitrile T=0 - 20°C; 6 h;

methanol; hydrazine hydrate

2: methanol; hydrazine hydrate View Scheme