Sodium hydride → 5-Chloro-6-(1,4-dioxa-spiro[4.5]dec-8-yloxy)-isoquinoline

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Reaction Steps

887 mg (5.61 mmol) 1,4-Dioxa-spiro[4.5]decan-8-ol were dissolved in 50 ml DMF and 224 mg (5.61 mmol) sodium hydride (60%) were added. After stirring for 30 minutes at room temperature, a solution of 815 mg (4.49 mmol) 5-chloro-6-fluoro-isoquinoline (8) in 10 ml DMF was added and the mixture was heated to 100° C. After 4 h one additional equivalent of 1,4-dioxa-spiro[4.5]decan-8-ol and sodium hydride were added and stirring was continued at 100° C. After 1.5 h complete conversion could be detected. For working up, the solvent was removed under reduced pressure, the residue was taken up in H2O and extracted three times with ethyl acetate. The combined organic layers were dried over MgSO4 and evaporated. The obtained orange oil (2.17 g) was stirred in diisopropyl ether and the insoluble white precipitate was filtered off. After drying of the precipitate, 549 mg of the title compound could be isolated. Rt=1.15 min (Method #1). Detected mass: 320.1/322.1 (M+H+).

Provenance & Evidence