Hydrochloric Acid → (R)-tert-butyl 2-(((4-amino-2,2-dioxido-1H-benzo[c][1,2,6]thiadiazin-5-yl)oxy)methyl)piperidine-1-carboxylate

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Reaction Steps

To a solution of (R)-tert-butyl-2-((2-cyano-3-(sulfamoylamino)phenoxy)methyl)piperidine-1-carboxylate (Example 15c, 10.7 g, 26.1 mmol) in ethanol (130 mL) was added aqueous NaOH (2N, 130 mL, 26.1 mmol). The solution was refluxed for 18 hours under nitrogen. After cooling to room temperature, the solution was cooled to 0° C. and neutralized with 1N HCl. The mixture was partially concentrated and the product was collected by filtration to afford (R)-tert-butyl 2-(((4-amino-2,2-dioxido-1H-benzo[c][1,2,6]thiadiazin-5-yl)oxy)methyl)piperidine-1-carboxylate, which was used immediately in the next step. MS 311 (MH+-boc).

Provenance & Evidence