NH4I in neat (no solvent) T=120°C; 1 h;

trimethylsilylazide in N,N-dimethyl-formamide T=150 - 160°C; 24 h;

pyrimidolt;5,4-ggt;pteridine N-oxide deriv in acetonitrile 0.833333 h; Ambient temperatureIrradiation;

1H-1-hydroxy-5-methyl-1,2,3-benziodoxathiole 3,3-dioxide in methanol 24 h; Reflux;

trimethylsilylazide in N,N-dimethyl-formamide T=150 - 160°C; 24 h;

1: 72.8 percent / pyridinium hydrobromide perbromide / acetic acid 2: 2.2 percent / sodium azide / dimethylformamide / 5 h / Ambient temperature View Scheme

1: 4-bromo-2'-hydroxylchalcone With zinc(II) chloride in dichloromethane T=20°C; 12 h; 2: 3,4,5-trimethoxyphenylboronic acid With tetrakis(triphenylphosphine) palladium(0); sodium carbonate in ethylene glycol dimethyl ether Suzuki coupling; Inert atmosphereReflux; 3: With dihydrogen peroxide in tetrahydrofuran; water T=0°C; 1 h; regioselective reaction;