1: T=20°C; Condensation; 4 h; 2: With ammonia in methanol T=20°C; Deacetylation; 24 h; Further stages.;

ammonium hydroxide in acetonitrile T=80°C; 2 h; Microwave irradiation;

1: chloro-trimethyl-silane; tert.-butylnitrite / dichloromethane / 0 °C 2: acetonitrile / 2 h / 25 °C 3: ammonium hydroxide / acetonitrile / 2 h / 80 °C / Microwave irradiation View Scheme

1: 1,8-diazabicyclo[5.4.0]undec-7-ene / acetonitrile / 25 °C 2: chloro-trimethyl-silane; tert.-butylnitrite / dichloromethane / 0 °C 3: acetonitrile / 2 h / 25 °C 4: ammonium hydroxide / acetonitrile / 2 h / 80 °C / Microwave irradiation View Scheme

1: acetonitrile / 2 h / 25 °C 2: ammonium hydroxide / acetonitrile / 2 h / 80 °C / Microwave irradiation View Scheme

sodium hydroxide; hydrogen; 10percent Pd/C in ethanol Catalytic hydrogenation; P=2327.23 Torr; 16 h;