Triethyl orthoacetate → 3-Methyl-9-pentyl-7-(trifluoromethyl)-6,9-dihydro-5H-[1,2,4]triazolo[4,3-a]purin-5-one
Reaction equation
[CH2:1]([N:6]1[C:14]2[N:13]=[C:12]([C:15]([F:18])([F:17])[F:16])[NH:11][C:10]=2[C:9](=[O:19])[NH:8]/[C:7]/1=[N:20]\[NH2:21])[CH2:2][CH2:3][CH2:4][CH3:5].[C:22](OCC)(OCC)(OCC)[CH3:23]>>[CH3:22][C:23]1[N:8]2[C:9](=[O:19])[C:10]3[NH:11][C:12]([C:15]([F:16])([F:18])[F:17])=[N:13][C:14]=3[N:6]([CH2:1][CH2:2][CH2:3][CH2:4][CH3:5])[C:7]2=[N:20][N:21]=1Participants
3
Procedure
A mixture of (2E)-3-pentyl-8-(trifluoromethyl)-3,7-dihydro-1H-purine-2,6-dione-2-hydrazone (0.020 g, 0.14 mmol) and triethyl orthoacetate (2 mL, 10 mmol) was stirred at room temperature for 1 h. The reaction mixture was concentrated under vacuum and the residue was purified by preparative LCMS. The product fractions were collected and lyophilized to yield pure product as white powder. LCMS calculated for C13H15F3N6O: (M+H) 329.1; found: 329.1.
Workup
- concentrationThe reaction mixture was concentrated under vacuum
- customthe residue was purified by preparative LCMS