Diisopropylethylamine → HCID 10322214, compound

Participants

Reaction Steps

3-(2-Chloroethyl)-7-methyl-5,6,7,8-tetrahydropyrido[4′,3′:4,5]thieno[2,3-d]pyrimidin-4(3H)-one (2.5 g, 8.81 mol; preparation: Example A3) was stirred together with 3-piperazin-1-yl-5-methyl-1,2-benzisoxazole (2.49 g, 11.45 mmol), diisopropylethylamine (15.4 ml, 88.1 mmol), sodium bromide (4.53 g, 44.05 mmol) and N-methyl-2-pyrrolidone (40 ml) at 70° C. for 4 days. After cooling, N-methyl-2-pyrrolidone and excess diisopropylethylamine were removed under high vacuum, the residue was added to water, the aqueous phase was extracted several times with ethyl acetate, and the organic phases were washed with water, dried over magnesium sulfate and concentrated in vacuo. The very impure crude product was chromatographed on silica gel (eluent: methylene chloride with slowly increasing methanol content (0-50%)). This resulted in 0.9 g of 7-methyl-3-{2-[4-(5-methyl-1,2-benzisoxazol-3-yl)piperazin-1-yl]ethyl}-5,6,7,8-tetrahydropyrido[4′,3′:4,5]thieno-[2,3-d]pyrimidin-4(3H)-one (yield: 22%) being obtained as a solid product which was converted into the corresponding dihydrochloride with ethereal hydrochloric acid.

Provenance & Evidence