Potassium Carbonate → 4-[7-(2-Butynyl)-1-(2-hydroxyethyl)-3-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl]piperazine-1-carboxylic acid tert-butyl ester

4-[3-Methyl-7-(2-butynyl)-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl]piperazine-1-carboxylic acid tert-butyl ester (0.30 g) and potassium carbonate (0.21 g) were dissolved in N,N-dimethylformamide (10 ml), and 2-(2-bromoethoxy)tetrahydro-2H-pyran (0.23 ml) was added thereto. After stirring at room temperature overnight, the reaction mixture was diluted with ethyl acetate, washed with water, and dried over magnesium sulfate. After removing the solvent by distillation, ethanol (10 ml) and pyridinium p-toluenesulfonate (60 mg) were added to the resulting residue, and the reaction mixture was stirred at 60° C. for 3 hours. The reaction solution was distilled. The residue was purified by silica gel column chromatography to obtain 0.14 g of the title compound from a fraction eluted with hexane-ethyl acetate (1:5).

1. washwashed with water
2. dry with materialdried over magnesium sulfate
3. customAfter removing the solvent
4. distillationby distillation, ethanol (10 ml) and pyridinium p-toluenesulfonate (60 mg)
5. additionwere added to the resulting residue
6. stirringthe reaction mixture was stirred at 60° C. for 3 hours
7. distillationThe reaction solution was distilled
8. customThe residue was purified by silica gel column chromatography

ORD record

ord-114b8ffc9eab403194a1dff7ee465f7f

Source dataset

uspto-grants-2006_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07074798B2