1: 71 percent / triethylamine, diphenylphosphoryl azide / dimethylformamide / 1.) -20 deg C, 1 h, 2.) 20 deg C, 20 h 2: 22 percent / NaNO2, formic acid / 0.5 h View Scheme

1: 55 percent / CHCl3 / 2 h 2: 71 percent / triethylamine, diphenylphosphoryl azide / dimethylformamide / 1.) -20 deg C, 1 h, 2.) 20 deg C, 20 h 3: 22 percent / NaNO2, formic acid / 0.5 h View Scheme

1: 71 percent / triethylamine, diphenylphosphoryl azide / dimethylformamide / 1.) -20 deg C, 1 h, 2.) 20 deg C, 20 h 2: 22 percent / NaNO2, formic acid / 0.5 h View Scheme

formic acid; sodium nitrite 0.5 h;