Hydrochloric Acid → 6'-bromo-4,4-difluorospiro[cyclohexane-1,2'-inden]-1'(3'H)-imine

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Reaction Steps

HCl (4M in 1,4-dioxane, 3.38 mL, 13.51 mmol) was added to a solution of N-(5′-bromo-4,4-difluorospiro[cyclohexane-1,2′-indene]-3′(1′H)-ylidene)-2-methylpropane-2-sulfinamide (Example 27 Step 1, 565 mg, 1.35 mmol) in anhydrous 1,4-dioxane (4 mL). The resulting mixture was stirred under a nitrogen atmosphere at r.t. for 90 min. Et2O (2 mL) was added and the precipitate was filtered off and washed with Et2O. The solid was partitioned between DCM (8 mL) and sat. aq. NaHCO3 (8 mL). The phases were separated and the organic layer was dried over MgSO4 and concentrated to give 6′-bromo-4,4-difluorospiro[cyclohexane-1,2′-inden]-1′(3′H)-imine (418 mg, 99% yield), that was used directly in the next step. MS (ES+) m/z 314 [M+H]

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