Trifluoroacetic acid → HCID 86605018, compound

Participants

Reaction Steps

Trifluoroacetic acid (30 ml) was added to a solution of solution of 1-(2-chloropyridin-4-yl)carbonylspiro[indoline-3,4′-piperidine]-1′-carboxylic acid tert-butyl ester (2.3 g) in anhydrous dichloromethane (50 ml), the solution darkening upon addition. The reaction was left as such for 15 min. The reaction mixture was evaporated in vacuo and the dark residue re-suspended in dry ether (100 ml). The residue was triturated until it became a free-flowing beige precipitate. The precipitate was collected by filtration and dried in a stream of nitrogen to give 2.28 g (96%) of the desired amine salt. M.p. 245° C. (decomposition). 1H NMR (400 MHz, d6-DMSO) 1.8 (m, 2H), 1.9 (m, 2H), 2.9 (m, 2H), 3.25 (m, 2H), 3.98 (s, 2H), 7.15-7.3 (m, 2H), 7.24 (d, J=8 Hz, 1H), 7.56 (d, J=7 Hz, 1H), 7.62 (s, 1H), 8.1 (br s, 1H), 8.56 (d, J=7 Hz, 1H), 8.8 (br s, 2H). MS (ES+) 328/330 (M+H+).

Provenance & Evidence