4-(N,N-dimethlyamino)pyridine; triphenylphosphine; 2aλ3-ioda-2,3-dioxa-cyclopenta[cd]indene-1,4-dione in chloroform T=60°C; 6 h;

benzotriazol-1-ol; dicyclohexyl-carbodiimide in tetrahydrofuran T=0 - 20°C; pH=9; 8 h;