1.1
Reagents:
Diisopropylethylamine
Solvents:
Acetonitrile
;
< 30 °C; 30 min, < 30 °C
1.2
Reagents:
Diisopropylethylamine
Catalysts:
4-(Dimethylamino)pyridine
;
1.5 - 2 h, rt; rt → -15 °C
1.3
Solvents:
Water
;
1.5 - 2 h, -15 - -6 °C