反应详情

tert-Butyl 2-methyl-6-(trifluoromethyl)spiro[3,4-dihydropyrrolo[1,2-a]pyrazine-1,4′-piperidine]-1′-carboxylate (7.8 g, 20.89 mmol) was stirred in 4M HCl in dioxane (26.10 mL of 4 M, 104.4 mmol) and methanol (22 mL) at room temperature for 1 h. The reaction mixture was evaporated to dryness and the residue was co-evaporated with 100 mL of MTBE to afford 2′-methyl-6′-(trifluoromethyl)-3′,4′-dihydro-2′H-spiro[piperidine-4,1′-pyrrolo[1,2-a]pyrazine]dihydrochloride as a yellow foam/solid (7.23 g, quantitative). ESI-MS m/z calc. 273.2, found 274.5 (M+1)+; Retention time: 0.44 minutes (3 min run).

1. customThe reaction mixture was evaporated to dryness