反应详情

A 1 L round bottom flask was charged with tert-butyl 4-(5-(thiophen-2-yl)tetrazolo[1,5-a]pyrazin-8-yl)piperazine-1-carboxylate (210 g, 0.54 mol) and THF (400 mL). To this solution was added concentrated HCl (40 mL) dropwise in an ice-water bath. The resulting solution was stirred at reflux for 0.5 h. Reaction progress was monitored by TLC (MeOH/CH2Cl2=1:10). Work-up: the resulting crystalline solid was collected by filtration, washed with EtOH (200 mL), and dried to afford 139 g (79%) of the product as a yellow solid. MS m/z: 288 (M+H+).

1. temperatureat reflux for 0.5 h
2. customReaction progress
3. filtrationthe resulting crystalline solid was collected by filtration
4. washwashed with EtOH (200 mL)
5. customdried