反应详情

3-Bromocinnamic acid (2.52 g, 11.1 mmol) and 3-(3-diethylaminopropyl)-1-ethylcarbodiimide hydrochloride (2.90 g, 15.2 mmol) were added to a solution of 5,6-diamino-1,3-diethyluracil (2.0 g, 10.1 mmol) in a dioxane (34 ml)-water (68 ml) mixture, and the resulting mixture was stirred at room temperature for 40 minutes while keeping the pH at 5.5. A 4N aqueous solution of sodium hydroxide was added thereto to adjust the pH to >14, and the mixture was heated under reflux for 20 minutes. After cooling, the mixture was neutralized and the precipitated crystals were collected by filtration. The obtained crude crystals were recrystallized from tetrahydrofuran/water to give 2.01 g (yield 37%) of Compound g as pale green plates.

1. temperaturethe mixture was heated
2. temperatureunder reflux for 20 minutes
3. temperatureAfter cooling
4. filtrationthe precipitated crystals were collected by filtration
5. customThe obtained crude crystals
6. customwere recrystallized from tetrahydrofuran/water