Hydrochloric Acid → HCID 178444709, compound

Participants

Reaction Conditions

Reaction Steps

(7-Iodo-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-acetic acid (Example 4b, 0.3 g, 0.819 mmol) was dissolved in N,N-dimethylformamide (4.1 mL). 1-(3,3-Dimethyl-butylamino)-1H-pyrrole-2-carboxylic acid allyl ester (Example 4c, 0.205 g, 0.819 mmol) was added followed by a 1.0 M solution of N,N-dicyclohexylcarbodiimide in dichloromethane (0.860 mL, 0.86 mmol). The mixture was stirred at 25° C. for 2 h. N,N-Dicyclohexylurea precipitation was visible at this point. The mixture was diluted with dichloromethane (5 mL) and filtered under reduced pressure. The filtrate was washed with 1.0 M aqueous hydrochloric acid solution (2×10 mL), saturated aqueous brine solution (10 mL), dried over magnesium sulfate, filtered and concentrated in vacuo to afford a golden oil. The oil was dissolved in ethanol (4.1 mL). A 21% solution of sodium ethoxide in ethanol (0.673 mL) was added and the mixture was stirred at 80° C. for 4 h. Additional sodium ethoxide in ethanol (0.673 mL) was added and the mixture was stirred at 80° C. for 4 h. Upon cooling to 25° C., the pH was adjusted to approximately 6 by the addition of 3.0 M aqueous hydrochloric acid solution. Immediate precipitation was observed. Methanol (3 mL) was added and the mixture was shaken vigorously. The solid was collected by vacuum filtration, rinsed with methanol (3×2 mL) and dried in vacuo for 16 h to afford the desired product, 1-(3,3-dimethyl-butyl)-4-hydroxy-3-(7-iodo-1,1-dioxo-1,4-dihydro-1λ6-benzo[1,2,4]thiadiazin-3-yl)-pyrrolo[1,2-b]pyridazin-2-one (0.268 g, 0.67 mmol, 82% yield) as a white powder. LC-MS (ESI) calcd for C20H21IN4O4S. found 540.03. found 366.95 [M+H+].

Provenance & Evidence