Ethyl 8-(cyanomethyl)-1,4-dioxaspiro[4.5]decane-8-carboxylate → 1,4-Dioxa-10-azadispiro[4.2.4.2]tetradecan-9-one

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Reaction Steps

8-Cyanomethyl-1,4-dioxa-spiro[4.5]decane-8-carboxylic acid ethyl ester (525 mg, obtained in example 121, step 2) was dissolved in methanol (10 mL) and acetic acid (5 mL). Platinum (IV) oxide (235 mg) was added and an atmosphere of hydrogen was introduced at RT. The mixture was stirred under hydrogen at room temperature for 18 hours. The reaction mixture was filtered over dicalite speed plus (Acros Organics) and the solvent was evaporated. The residue was poured into ice/water and was basified with 2M aqueous NaOH solution. The aqueous layer was extracted two times with ethyl acetate. The combined organic layers were washed with brine, dried over Na2SO4, filtered and the solvent was evaporated. The residue was purified by flash chromatography (silica gel, gradient of heptane in ethyl acetate) to give the title compound as a colorless solid (169 mg, 39%). MS (m/e): 212.2 [MH+].

Provenance & Evidence