magnesium sulfate; potassium carbonate in n-heptane; water; N,N-dimethyl-formamide; acetonitrile

1: 5-hydroxy-quinoline With potassium tert-butylate in tetrahydrofuran T=20 - 25°C; 1 h; 2: (2R)-3-(2-nitrobenzenesulfonyloxy)-1,2-epoxypropane in tetrahydrofuran T=23 - 26°C; 16 h;

potassium carbonate in N,N-dimethyl-formamide T=25°C; 20 h;