Acetic Acid → HCID 86651946, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of (E)-ethyl 3-(6-cyano-1H-indazol-3-yl)acrylate (723 mg, 3 mmol) in pyridine (10 mL) was added acetic acid (3 mL), followed by a solution of NaH2PO2 (1.056 g, 12 mmol) in H2O (3 mL). The resulting mixture was stirred for 0.5 min at rt before Raney-Nickel 2400 (slurry in H2O, 0.6 mL) was added in one portion. The resulting mixture was heated at 55° C. (oil temp.) for 1 h before cooling to rt. H2O (30 mL) was added and the mixture was extracted with EtOAc (50 mL×2). Combined extracts were washed with H2O (20 mL), 2 M HCl (20 mL), H2O (20 mL×2), brine (15 mL) and dried (Na2SO4). Removal of solvent gave an orange red oil which solidified upon standing O/N under high vacuum. It was then triturated with H2O (30 mL) and suction filtered, rinsed with H2O, dried to give the title compound (476 mg, 65%) as an orange red solid. 1H NMR (400 MHz, DMSO-d6) δ 14.16 (s, 1H, NH), 10.14 (s, 1H, CHO), 8.30 (d, J=8.8 Hz, 1H), 8.22 (s, 1H), 7.92 (d, J=16.4 Hz, 1H), 7.71 (d, J=7.6 Hz, 1H), 6.82 (d, J=8.4 Hz, 1H), 4.22 (q, J=6.8 Hz, 2H), 1.28 (t, J=6.8 Hz, 3H); MS ESI 245.0 [M+H]+, calcd for [C13H12N2O3+H]+ 245.1.

Provenance & Evidence