Hydrochloric Acid → HCID 13770482, compound

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Reaction Steps

A mixture of 3.13 g of ethyl 4,5-dihydro-5-ethyl-4-oxo-imidazo-[1,2-α]-quinoxaline-2-carboxylate, 0.5 g of lithium borohydride and 80 ml of anhydrous tetrahydrofuran was refluxed with stirring for 20 hours and the resulting suspension was poured into dilute hydrochloric acid. The mixture was stirred for 10 minutes to break the boron complex and the pale yellow clear solution was made alkaline with sodium carbonate addition. The mixture was extracted with ethyl acetate and the organic phase was evaporated to dryness to obtain 1.93 g of 4,5-dihydro-5-ethyl-imidazo-[1,2-a]-quinoxaline-2-methanol in the form of a buff crystalline solid which was crystallized from ethanol to obtain shiny white plates melting at 160°-165° C. with decomposition.

Provenance & Evidence