1.1
Reagents:
Trichloroacetonitrile
Solvents:
Dichloromethane
;
rt → 0 °C
1.2
Reagents:
1,8-Diazabicyclo[5.4.0]undec-7-ene
;
5 min, 0 °C; 40 min, 0 °C; 5 min, rt
1.3
Reagents:
Boron trifluoride etherate
;
overnight, rt
1.4
Reagents:
Tetrabutylammonium fluoride
Solvents:
Tetrahydrofuran
;
overnight, rt