Formaldehyde → HCID 57687099, compound

Participants

Reaction Steps

37% Aqueous formaldehyde (0.060 ml) was added to a stirred solution of 3-(1,3-benzothiazol-2-yl)-5-[1-(4-piperidyl)pyrazol-4-yl]pyridin-2-amine (0.250 g) dissolved in methanol (2.5 ml) and DCM (2.5 ml). Sodium triacetoxyhydroborate (0.141 g) was added and the resulting solution was for 30 minutes. The mixture was concentrated. DCM and 7N methanol/ammonia were added. The mixture was concentrated on silica gel and the residue was purified by flash chromatography on silica gel eluting with 2 to 10% methanolic ammonia (7 N) in DCM. The solvent was evaporated to dryness to afford a solid. Acetonitrile (4 ml) was added and the solution was stirred overnight. The solid was filtered, and dried under vacuum. There was thus obtained 3-(1,3-benzothiazol-2-yl)-5-[1-(1-methyl-4-piperidyl)pyrazol-4-yl]pyridin-2-amine (0.198 g); Mass Spectrum: M+H+ 391; NMR Spectrum (DMSOd6): 8.48 (d, 1H), 8.33 (s, 1H), 8.16 (d, 1H), 8.15 (d, 1H), 8.10 (d, 1H), 7.93 (s, 1H), 7.88 (bs, 2H), 7.57 (dd, 1H), 7.49 (dd, 1H), 4.08-4.18 (m, 1H), 2.84-2.92 (m, 2H), 2.22 (s, 3H), 1.94-2.12 (m, 6H).

Provenance & Evidence