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

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Reaction Steps

HCl (4 M in 1,4-dioxane, 1.489 mL, 5.96 mmol) was added to a solution of N-(5′-(3-fluoro-propoxy)-4-methoxyspiro[cyclohexane-1,2′-indene]-3′(1′H)-ylidene)-2-methylpropane-2-sulfinamide (Example 20v, Step 1, 244 mg, 0.60 mmol) in anhydrous 1,4-dioxane (25 mL). A white precipitate was formed immediately and the resulting cloudy mixture was stirred under a nitrogen atmosphere overnight. The mixture was diluted with NaHCO3 (aq) and extracted with DCM, dried over MgSO4 and concentrated in vacuo to give 204 mg (quantitative yield) of the title compound that was used without any purification in the next step: MS (ES+) m/z 306 [M+H]+.

Provenance & Evidence