ammonia; sodium amide

in dichloromethane; pentane (inert atmosphere); -30°C to room temp., stirring (1 h); concn. (vac.), keptt for 1 h, evapn. (vac.), dissoln. (n-pentane), chromy. (SiO2; CH2Cl2/n-pentane, -35°C), evapn. (vac.), crystn. (CH2Cl2/n-pentane, -35°C); elem. anal.;

in dichloromethane; pentane (inert atmosphere); -30°C, 1 h; under similar conditions a mixture (elem. anal.) of 5 tautomeric compounds (assignment by NMR) is obtained; removal of solvents (vac., -30°C), chromy. (SiO2; CH2Cl2/n-pentane gradient, -35°C), solvent removal (vac., -30°C), the twomain byproducts could not be obtained pure;

in dichloromethane under N2, 18 h at 40°C; removal of solvent in vac., chromy. on silica gel (petroleum ether/CH2Cl2 (2:1), 0°C), removal of solvent in vac., recrystn. (petroleum ether/toluene 5:1); elem. anal.;

potassium hydroxide 1) chloroform, 135 deg C, 73 h 2) MeOH, 65 deg C, 4-28 h; Yield given. Multistep reaction;

in chloroform T=80°C; 24 h;