1: 95 percent / NH3; Ph3P / methanol; pyridine / 12 h / 20 °C 2: 62 percent / DCC; N-hydroxysuccinimide / dimethylformamide / 0 - 20 °C 3: 36 percent / TFA / 0.13 h / 20 °C View Scheme

ammonia; triphenylphosphine in pyridine; methanol T=20°C; Staudinger reaction; 12 h;