Sodium Methoxide → 8-Ethoxy-4-hydroxy-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-2-one

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To a solution of 2.3 g of 1-ethoxy-4-[2-(2,4,6-trimethyl-phenyl)-acetylamino]-piperidine-4-carboxylic acid methyl ester in 26 ml of dimethylformamide was added 3 g of sodium methoxide. The reaction mixture was heated to 65° C. and stirred for 5 hours. The reaction mixture was poured into brine, neutralized and extracted with ethyl acetate. The organic phase was washed with brine, dried with sodium sulfate, filtered and concentrated. The residue was subjected to column chromatography (heptane/ethyl acetate 2:1) to yield 510 mg of 8-ethoxy-4-hydroxy-3-(2,4,6-trimethyl-phenyl)-1,8-diaza-spiro[4.5]dec-3-en-2-one (compound C8) as a solid, mp: >250° C.

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