Dimethylformamide dimethyl acetal → HCID 86667475, compound

Participants

Reaction Steps

A solution of 4-(4-chlorobenzyl)-2-(2-chloropyridin-4-yl)thiazole-5-carboxamide (128 mg, 0.351 mmol) and 1,1-dimethoxy-N,N-dimethylmethanamine (0.467 mL, 3.51 mmol) in toluene (3.75 mL) was heated at 100° C. for 1 hour. The reaction was cooled and concentrated in vacuo to give the intermediate, 4-(4-chlorobenzyl)-2-(2-chloropyridin-4-yl)-N-((dimethylamino)methylene)thiazole-5-carboxamide, as a solid. LC/MS (FA) ES+ 419, 421. The intermediate was dissolved in acetic acid (3.60 mL). Hydrazine hydrate (0.0855 mL, 1.76 mmol) was added and the resulting solution was heated at 90° C. for 2 hours. The mixture was cooled and concentrated in vacuo, and the residue was azeotroped with toluene. The residue was slurried in DCM (30 mL) and saturated sodium bicarbonate (20 mL). Some undissolved solids were filtered to give one batch of desired product. The layers of the filtrate were separated and the aqueous layer was extracted with DCM (2×20 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo to give another batch of desired product. The two product batches were combined and purified by silica gel chromatography (methanol/DCM=0/100→20/80) to give 85 mg of the title compound as a beige solid (62% yield). LC/MS (FA) ES+ 388, 390. 1H NMR (300 MHz, d6-DMSO) δ: 14.48 (bs, 1H), 8.76 (s, 1H), 8.54-8.51 (m, 1H), 7.96-7.95 (m, 1H), 7.92-7.89 (m, 1H), 7.38-7.30 (m, 4H), 4.65 (s, 2H).

Provenance & Evidence