Methanol → Ethyl 7-(2-bromo-3-chloro-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate

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Reaction Conditions

Reaction Steps

7-(2-bromo-3-chloro-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate A cooled (0° C.) solution of ethyl 7-(2-bromo-3-chloro-6-oxo-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate (step 1)(1.0 g, 2.388 mmol) in THF (10 ml) under a nitrogen atmosphere was treated with borane-methyl sulfide complex over 30 mins. The resulting mixture was stirred at 0° C. for 2 h 30 minutes and stored in a fridge overnight. The mixture was cooled in an ice bath and cautiously treated with MeOH (5 ml). The yellow solution was stirred at 0° C. for 1 hour and concentrated under reduced pressure. The crude material was purified by chromatography on silica eluting with 0-100% EtOAc in iso-hexane to afford ethyl 7-(2-bromo-3-chloro-7,8-dihydropyrido[2,3-b]pyrazin-5(6H)-yl)heptanoate

Provenance & Evidence