Lithium hydroxide, monohydrate → HCID 86673091, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 4-(tert-Butoxyimino)-2-pyrrolo[1,2-c]pyrimidin-3-yl-4H-chromene-6-carboxylic acid methyl ester (example 115B) (170 mg, 0.43 mmol) in a mixture of tetrahydrofuran/methanol/water (2.0 ml/0.5 ml/0.5 ml) was treated with lithium hydroxide monohydrate (55 mg, 1.29 mmol) and heated at 60° C. for 2 hours. The solvents were removed and the residue was diluted with water, neutralized to pH 5-6 with a 1N solution of hydrochloric acid and extracted with ethyl acetate. The combined organic extracts were washed with brine, dried over sodium sulfate and concentrated to dryness to give 4-(tert-Butoxyimino)-2-pyrrolo[1,2-c]pyrimidin-3-yl-4H-chromene-6-carboxylic acid (135 mg, 84%) as a green solid. A solution of the previous carboxylic acid, (3-Dimethylamino-propyl)-ethyl-carbodiimide, hydrochloride (90 mg, 0.47 mmol), 1-Hydroxybenzotriazole hydrate (68 mg, 0.50 mmol) and triethylamine (250 μl, 1.80 mmol) in dimethylformamide (6.0 ml) was stirred at 0° C. for 1 hour then 4-(2-aminoethyl)-morpholine (52 μl, 0.40 mmol) was added. The mixture was stirred at room temperature for 18 hours. The volatiles were removed under vacuum and the residue taken into ethyl acetate, washed several times with a saturated solution of sodium hydrogenocarbonate, brine, dried over sodium sulfate and concentrated to dryness. The residue was purified by silica gel flash chromatography (gradient ethyl acetate/methanol 0-8%) to yield the title compound as a yellow solid (137 mg, 78%).

Provenance & Evidence