Water → N-Butyl-N-(2-(2-(5-hydroxy-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-8-yl)ethylamino)ethyl)-3-(3-(2-(4-(2-isopropylthiazole-4-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl)ethyl)phenethoxy)propanamide monosulphate salt

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Reaction Steps

N-butyl-N-(2-(2-(5-hydroxy-3-oxo-3,4-dihydro-2H-benzo[b][1,4]oxazin-8-yl)ethylamino)ethyl)-3-(3-(2-(4-(2-isopropylthiazole-4-carbonyl)-1-oxa-4,9-diazaspiro[5.5]undecan-9-yl)ethyl)phenethoxy)propanamide (limiting reagent) was dissolved in EtOH (15 vols) and 4.9M sulphuric acid (1 molar equivalent) was added and the solution was stirred at room temp for 48 hours. The precipitate was collected, washed with EtOH (1 voll) and vacuum dried (oven at 40° C., oil pump) to leave a white solid (70% recovery). 5% water in MeCN (20 volumes) was added and the mixture stirred for 6 days. Crystalline solid (form G) was then collect by filtration (95% recovery).

Provenance & Evidence