反应详情

To a fresh prepared solution of sodiumethanolate in ethanol (prepared from 0.44 g (18.92 mmol) Na in 20 ml Ethanol) 1.50 g (9.46 mmol) pyrimidine-2-carboxamidine hydrochloride was added. After 10 min. 1.89 ml (9.46 mmol) diethyl ethoxymethylenemalonate was added at 0° and the resulting suspension was stirred for 12 hrs. After addition of 20 ml H2O, the pH was adjusted to 5 and the aqueous phase was extracted three times with CH2Cl2. The combined organic phases were dried (Na2SO4), filtered and evaporated. The residue was triturated with 5 ml diisopropylether, filtered off and dried to give 1.62 g (70%) 4-hydroxy-[2,2′]bipyrimidinyl-5-carboxylic acid ethyl ester as a light yellow powder, MS (EI): 246.1 (M+).

1. extractionthe aqueous phase was extracted three times with CH2Cl2
2. dry with materialThe combined organic phases were dried (Na2SO4)
3. filtrationfiltered
4. customevaporated
5. customThe residue was triturated with 5 ml diisopropylether
6. filtrationfiltered off
7. customdried