Sodium Hydroxide → HCID 15231555, compound

Participants

Reaction Steps

0.29 g of NaOH pellets in 2 ml of water was added at 5° C., with stirring, to a solution of 1.1 g of 5-ethoxy-1,3-dihydro-1-(2-methoxy-4-aminobenzenesulfonyl)-3-cyclo-hexyl-2H-benzimidazol-2-one, obtained in Example 5 step B), in 25 ml of THF. 1 ml of phenyl chloroformate was then added with continued stirring. The reaction mixture was then stirred for 5 hours, the temperature being allowed to rise to 20° C. The mixture was then concentrated under vacuum, the residue was taken up with water, extracted with ether and washed with water and the organic phase was dried over sodium sulfate and concentrated under vacuum. 1 g of the expected product was obtained by crystallization from iso ether. M.p.=197° C.

Provenance & Evidence