4-chloropyridine N-oxide → (3R)-3-[(2-Chloro-benzoyl)amino]-N-methyl-N-[1-(1-oxido-pyridin-1-ium-4-yl)-piperidin-4-yl]-2,3-dihydro-1H-indene-5-carboxylic acid amide

Participants

Reaction Conditions

Reaction Steps

A mixture of (R)-3-(2-chlorobenzamido)-N-methyl-N-(piperidin-4-yl)-2,3-dihydro-1H-indene-5-carboxamide (see stage 2 illustrative compound H-214) (200 mg, 0.486 mmol, 1 eq), 4-chloropyridine N-oxide (63 mg, 0.486 mmol, 1 eq) and DIPEA (0.210 ml, 1.215 mmol, 2.5 eq) in ethanol (10 ml) was heated for 72 h at 130° C. in a pressure vessel. The reaction mixture was concentrated under reduced pressure and the crude product was then prepurified by column chromatography (Alox, 1% methanol/dichloromethane). It was then further purified by means of preparative TLC. The desired product was in the form of a white solid. Yield: 18% (90 mg, 0.178 mmol) The indicated yield is based on 2 combined batches of size 200 mg

Provenance & Evidence