5-(1-tert-butoxycarbonyl-1,2,3,6-tetrahydro-pyridin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester → 5-(1-tert-butoxycarbonyl-piperidin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester

Participants

Reaction Steps

A mixture of 5-(1-tert-butoxycarbonyl-1,2,3,6-tetrahydro-pyridin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester (495 mg, 0.9 mmol), 5% palladium carbon (100 mg), and methanol (20 ml) was stirred under a hydrogen atmosphere for 13 hours. The reaction mixture was filtered through Celite, and washed with ethyl acetate, and the filtrate was concentrated. The residue obtained by concentration under reduced pressure was purified by silica gel column chromatography. Thus, 5-(1-tert-butoxycarbonyl-piperidin-4-yl)-1-(toluene-4-sulfonyl)-1H-indole-2-carboxylic acid ethyl ester was obtained as a colorless amorphous material (315.9 mg, 64%).

Provenance & Evidence