2-(tert-butyoxyoxalyl-amino)-5-((2-(1H-indol-3-yl)-2-oxo-acetylamino)methyl)-6-(4-methoxy-benzyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester → 2-(tert-butyoxyoxalyl-amino)-5-((2-(1H-indol-3-yl)-2-oxo-acetylamino)methyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester

Participants

Reaction Steps

2-(tert-Butyoxyoxalyl-amino)-5-((2-(1H-indol-3-yl)-2-oxo-acetylamino)methyl)-6-(4-methoxy-benzyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester (101 mg, 0.143 mmol) was dissolved in dry tetrahydrofuran (6 ml) and passed through a pipette, plugged with cotton containing Raney 2800 Nickel (0.38 g). The pipette was flushed with dry tetrahydrofuran (6 ml) and the filtrate was concentrated in vacuo. Pd on carbon (10%, 102 mg, source: Avocado) and formic acid (10% in methanol, 5 ml) were added to the flask containing 2-(tert-Butyoxyoxalyl-amino)-5-((2-(1H-indol-3-yl)-2-oxo-acetylamino) methyl)-6-(4-methoxy-benzyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester. After stirring for 18 hours, the solution was filtered through a pad of celite and concentrated in vacuo. The residue was diluted in ethyl acetate, washed with saturated sodium bicarbonate (2×25 ml), brine (2×25 ml), dried (MgSO4), filtered and concentrated in vacuo. The residue was subjected to flash chromatography using a mixture of 10% methanol/dichloromethane as eluent, which afforded 2-(tert-butyoxyoxalyl-amino)-5-((2-(1H-indol-3-yl)-2-oxo-acetylamino)methyl)-4,5,6,7-tetrahydro-thieno[2,3-c]pyridine-3-carboxylic acid tert-butyl ester.

Provenance & Evidence