Sodium Hydroxide → HCID 9976966, compound

Participants

Reaction Steps

A 0.7 g quantity of 3-(4-chlorobenzyl)-1-ethoxycarbonylmethyl-5,6-dimethylthieno[2,3-d]pyrimidin-2,4(1H, 3H)-dione (Compound IV-1) prepared in Reference Example 5 was dissolved in 30 ml of methanol. To the solution was added 0.3 g of sodium hydroxide dissolved in 2 ml of water. The mixture was allowed to react at 60° C. for 30 minutes, and then the reaction mixture was concentrated. Diluted hydrochloric acid was added thereto with ice-cooling to acidify the resulting solution. The solution was filtrated and the separated crystals were recrystallized from methanol, giving 0.4 g of 1-carboxymethyl-3-(4-chlorobenzyl)-5,6-dimethylthieno[2,3-d]pyrimidin-2,4(1H, 3H)-dione having m.p. of 173° to 176° C. in a yield of 61%.

Provenance & Evidence