N-cyclohexyl-8-methyl-4,4-dioxo-8-(phenylmethoxymethyl)-7-oxa-4lambda6-thia-5-azaspiro[2.5]oct-5-en-6-amine → N-cyclohexyl-4,4-dioxo-8-phenyl-7-oxa-4lambda6-thia-5-azaspiro[2.5]oct-5-en-6-amine

Participants

Reaction Steps

Under inert gas, 80 mg of (8-benzyloxymethyl-8-methyl-4,4-dioxo-7-oxa-4lambda6-thia-5-azaspiro[2.5]oct-5-en-6-yl)cyclohexylamine were initially charged in 6 ml of ethanol and, with addition of 5 mg of 5% Pd/C, stirred under a hydrogen atmosphere for 16 hours. The completeness of the conversion was checked by LCMS and the reaction was once again admixed with 5 mg of 5% Pd/C, and the mixture was stirred under a hydrogen atmosphere for a further 2 hours. After filtration to remove the solid residues, the filtrate was freed of the solvent under reduced pressure. The crude product was purified by means of normal phase chromatography using a Flashmaster with an n-heptane/ethyl acetate gradient. The product-containing fractions were combined and concentrated by rotary evaporation, then taken up again in 10 ml of a mixture of acetonitrile and water (9:1) and lyophilized. This gave the product (32 mg) with a molecular weight of 302.4 g/mol (C13H22N2O4S); MS (ESI): m/e=303 (M+H+).

Provenance & Evidence