Hydrochloric Acid → 8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid N-isopropyl-hydrazide dihydrochloride

Participants

Reaction Conditions

Reaction Steps

A solution of N′-(8-bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carbonyl)-N′-isopropyl-hydrazinecarboxylic acid tert-butyl ester (2.71 g, 5.83 mmol) in methanol (52 mL) was treated with 4N HCl in dioxane (5.83 mL, 23.3 mmol). The reaction mixture was stirred at 50° C. overnight before the reaction was concentrated in vacuo and the resultant residue triturated with diethyl ether to give 8-Bromo-4,5-dihydro-6-oxa-1,3a-diaza-benzo[e]azulene-2-carboxylic acid N-isopropyl-hydrazide dihydrochloride as a pale yellow foam (2.69 g, quantitative yield). LCMS RT=4.17 min, [M+H]+=365/367

Provenance & Evidence