3-oxo-2,3-dihydro-1H-isoindole-1-carboxylic acid → 7-[(2,3-Dihydro-3-oxo-1H-isoindol-1-yl)carbonyl]-hexahydro-1,1-diphenyl-3H-oxazolo[3,4-a]pyrazin-3-one

Participants

Reaction Steps

In the same manner as in Reference Example 19, the reaction was performed using 2,3-dihydro-3-oxo-1H-isoindole-1-carboxylic acid instead of 1,4-bis(phenylmethyl)-2-piperazine carboxylic acid, and using hexahydro-1,1-diphenyl-3H-oxazolo[3,4-a]pyrazin-3-one instead of N,O-dimethylhydroxylamine hydrochloride and triethylamine. The reaction solution was extracted with ethyl acetate, washed with a 0.5 M aqueous sodium hydrogen carbonate solution, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. To the residue was added hexane-ethyl acetate. Then, the obtained crystals were collected by filtration and washed with hexane to obtain the title compound. Yield 14%.

Provenance & Evidence