Water → HCID 14552443, compound

Participants

Reaction Steps

A solution of 0.5 g (1.5 mmole) of ethyl 2-amino-5-propyl-trans-4,4a,5,6,8a,9-hexahydrothiazolo-[4,5-g]quinoline-7-carboxylate (Example 3) in 50 ml of 85% phosphoric acid was cooled to 0° C. Then 110 mg (1.8 mmole) of sodium nitrite dissolved in as small an amount of water as possible was slowly added under the surface of the reaction mixture. The resulting mixture was added dropwise to 50 ml of 50% hypophosphorous acid (H3PO2) at 0° C. The mixture was stirred at room temperature until gas evolution ceased. This took about 1 hour. The mixture was poured onto ice, and the hydrogen ion concentration of the mixture was adjusted to pH 11. Water was added to dissolve the precipitate that formed; then the product was extracted into a solution of CHCl3 /i-PrOH (3:1). This solution was dried using sodium sulfate and evaporated to give 0.46 g of the title product.

Provenance & Evidence