Hydrochloric Acid → 6-[(6-Methylpyridin-2-yl)methyl]-1,4-oxazepane dihydrochloride

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Reaction Steps

tert-Butyl 6-[(6-methylpyridin-2-yl)methyl]-1,4-oxazepane-4-carboxylate (Preparation 83, 42.5 g, 0.14 mol, 1 eq) was dissolved in isopropanol (250 mL), concentrated hydrogen chloride (38 mL, 0.42 mol, 3 eq) was added under stirring, and the mixture was refluxed for 2 h. The reaction mixture was then evaporated, and the residue was coevaporated twice with isopropanol. The product was crystallized from isopropanol, and the crystals were washed with diethylether/isopropanol (3:1) mixture and ether and finally vacuum-dried to give title compound as white crystals (32.3 g, 0.12 mol, 82%).

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