1: 80 percent / HONB, DCCI / dimethylformamide / 1.) 2 h, -20 deg C; 2.) 3 h, room temperature 2: 98 percent / HCl, CH3COOH, C2H5SH / 0.75 h / Ambient temperature 3: 86 percent / N-methylmorpholine / 48 h View Scheme

1: 80 percent / HONB, DCCI / dimethylformamide / 1.) 2 h, -20 deg C; 2.) 3 h, room temperature 2: 98 percent / HCl, CH3COOH, C2H5SH / 0.75 h / Ambient temperature View Scheme