1.1
Reagents:
Triphenylphosphine
,
Diisopropyl azodicarboxylate
Solvents:
Diethyl ether
;
20 min, 0 °C
1.2
Solvents:
Diethyl ether
;
3 h, rt
1.3
Reagents:
Trifluoroacetic acid
Solvents:
Dichloromethane
;
0 °C; 2 h, rt