Triethylamine → 2-(7-Chloro-5-methyl-1,8-naphthyridin-2-yl)-3-[2-(1,4-dioxa-8-azaspiro[4.5]decan-8-yl)-2-oxoethyl]-2,3-dihydro-1H-isoindol-1-one

Participants

Reaction Steps

With ice-cooling and stirring, 1.6 g of 1,4-dioxa-8-azaspiro[4.5]decane, 2 ml of triethylamine and 2.2 g of diethyl phosphorocyanidate were successively added to a solution of 3.5 g of 2-(7-chloro-5-methyl-1,8-naphthyridin-2-yl)-3-oxoisoindoline-1-acetic acid in 30 ml of dimethylformamide. The mixture was stirred with ice-cooling for an additional 2 hours and 200 ml of ice-water was added thereto. The mixture was allowed to stand, and the resulting crystalline precipitate was collected by filtration, washed with water and dried. Recrystallization from dichloromethane-ether (1:4) gave 4.23 g of colorless crystals melting at 259°-262° C.

Provenance & Evidence