3H-Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 2-amino-4,7-dihydro-4-oxo-

53106-70-0

56-06-4

69205-79-4

GENERAL PROCEDURE: Preparation of 4-amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile: To a solution of trace water (90 mL) containing sodium acetate (6.4 g, 76 mmol) was added 2,4-diamino-6-hydroxypyrimidine (3.00 g, 24 mmol), and stirred for 1 hour at 50 °C. Maintaining the temperature at 50 °C, a solution of crude 2-chloro-2-formylacetonitrile (3.00 g, 32 mmol) in deionized water (44 mL) was slowly added dropwise through a dropping funnel, and the reaction mixture gradually changed to a beige color. The reaction temperature was then raised to 80 °C and heating was continued for 18 hours. After that, the reaction temperature was further raised to 100 °C and maintained for 3 hours. After completion of the reaction, the mixture was cooled to room temperature and the solid was collected by filtration. The resulting solid was suspended in ethanol and saturated aqueous KOH solution was added dropwise until the solid was completely dissolved. Activated carbon was added to the solution and the solid was removed by filtration after stirring for 30 minutes. The pH of the filtrate was adjusted to 6 with concentrated aqueous hydrochloric acid, at which time a precipitate was generated and collected by filtration. For complete removal of residual water, the solid was dissolved in a solvent mixture of toluene/methanol (1:1) and subsequently concentrated under reduced pressure. Finally, the obtained solid was dried over P2O5 to afford the target compound 4-amino-4,7-dihydro-4-oxo-3H-pyrrolo[2,3-d]pyrimidine-5-carbonitrile (1.68 g, 9.6 mmol, 40% yield) as a beige solid. The synthesis is referenced from Brooks 2012.1H NMR (400 MHz, DMSO-d6) δ 11.98 (br s, 1H), 10.74 (br s, 1H), 7.59 (s, 1H), 6.43 (s, 2H). 13C NMR (100 MHz, DMSO-d6) δ 158.0, 154.3, 152.1, 128.2, 116.4, 99.2, 86.0. HRMS (m/z ESI): [C7H5N5O - H] Calculated value 174.0416, measured value 174.0415.