Sodium Hydroxide → 1,1-Dimethylethyl 4-[6-(benzyloxy)-3-(3,4-dimethoxybenzyl)-2,4-dioxo-3,4-dihydroquinazolin-1(2H)-yl]piperidine-1-carboxylate

Participants

Reaction Steps

A mixture of 2.5 g of 1,1-dimethylethyl 4-[{4-(benzyloxy)-2-[(3,4-dimethoxybenzyl)carbamoyl]phenyl}(isobutoxycarbonyl)amino]piperidine-1-carboxylate obtained in stage 1.4 and 7.4 g of NaOH in 18.5 ml of DCE is irradiated under a microwave field at 110° C. for 30 min. The same reaction is repeated with 2 other lots of 2.5 g of 1,1-dimethylethyl 4-[{4-(benzyloxy)-2-[(3,4-dimethoxybenzyl)carbamoyl]phenyl}-(isobutoxycarbonyl)amino]piperidine-1-carboxylate. The 3 reaction media are combined. The combined product is taken up in DCM, washed with water, dried over Na2SO4 and filtered, and the solvent is evaporated under reduced pressure to give 6.6 g of expected product.

Provenance & Evidence