Hydrochloric Acid → 4-(3-Chloropyrazin-2-yl)cyclohexanone

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Reaction Steps

2-Chloro-3-(1,4-dioxaspiro[4.5]decan-8-yl)pyrazine (0.29 g, 1.14 mmol) was dissolved in acetone (8 mL) and 1M aqueous hydrochloric acid (1.0 mL, 1.0 mmol) was heated to 50° C. for 4 h, then cooled to RT. The acetone was removed under vacuum and the solution was then diluted with EtOAc. This mixture was transferred to a reparatory funnel and washed with sat. aqueous sodium bicarbonate (1×), brine (1×), dried over magnesium sulfate, filtered, and concentrated in vacuo. The resulting oil was purified by silica gel chromatography to give 4-(3-chloropyrazin-2-yl)cyclohexanone.

Provenance & Evidence