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

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Reaction Steps

4-[7-(2-Butynyl)-1,3-bis-(2,2-dimethylpropionyloxymethyl)-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-8-yl]piperazine-1-carboxylic acid tert-butyl ester (0.63 g) was dissolved in a solvent mixture of tetrahydrofuran (4 ml) and methanol (2 ml), and diazabicyclo[5.4.0]undecene (0.18 ml) was added to the solution. The mixture was stirred at room temperature overnight. The reaction mixture was concentrated, and the residue was purified by silica gel column chromatography to give 0.29 g of the title compound from the elution fraction of hexane-ethyl acetate (1:5).

Provenance & Evidence