Triethylamine → Ethyl {6-[(1-methoxy-2-phenylindolizin-3-yl)carbonyl]-2,4-dioxo-1,4-dihydroquinazolin-3(2H)-yl}acetate

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Reaction Steps

0.208 g (0.7 mmol) of triphosgene diluted in 15 ml of dioxane is added, under an inert atmosphere at ambient temperature, to 0.4 g (1 mmol) of methyl 2-amino-5-[(1-methoxyindolizin-3-yl)carbonyl]benzoate in 50 ml of dioxane. After stirring for 1 hour, 0.279 g (2 mmol) of ethyl glycinate and 0.70 ml (5 mmol) of triethylamine are added. After stirring at ambient temperature for 2 hours, the reaction medium is hydrolysed with water. After an overnight period at ambient temperature, the aqueous phase is extracted with dichloromethane. The organic phase obtained is washed with a saturated aqueous solution of sodium chloride, dried over sodium sulphate, filtered, and then concentrated under reduced pressure. The solid obtained is purified by silica gel column chromatography, elution being carried out with a dichloromethane/methanol (95/5) mixture. 0.362 g of a yellow solid is obtained.

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