1.1
Reagents:
Oxalyl chloride
Catalysts:
Dimethylformamide
Solvents:
Dichloromethane
;
0 °C; 4 h, rt
1.2
Reagents:
Diisopropylethylamine
Solvents:
Dichloromethane
;
30 min, rt
1.3
0 °C; 2 h, rt