Hydrochloric Acid → HCID 66749253, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of N-allyl-4-(4-chlorobenzyl)-2-(pyridin-4-yl)thiazole-5-carboxamide (150 mg, 0.406 mmol) in DCM (2.64 mL) was added phosphorus pentachloride (101 mg, 0.485 mmol) and 4 M hydrochloric acid in 1,4-dioxane (0.0154 mL, 0.0614 mmol) and the mixture was heated to 60° C. for 1.5 h. The reaction was cooled to room temperature and aminoacetaldehyde dimethyl acetal (0.486 mL, 4.46 mmol) was added. The resulting mixture was heated at 60° C. for 2 h. The mixture was cooled to room temperature, diluted with DCM (10 mL), washed with water (2×2 mL) and brine (2 mL), dried over sodium sulfate, filtered, and concentrated in vacuo. The residue was taken up in DCM (3.0 mL) and 4 M hydrochloric acid in 1,4-dioxane (0.608 mL, 2.43 mmol) was added and the mixture was stirred at 60° C. overnight. The reaction was cooled and concentrated in vacuo. The residue was taken up in ethyl acetate (20 mL) and saturated sodium bicarbonate (5 mL). The layers were separated and the aqueous layer was extracted with ethyl acetate (5 mL). The combined organic layers were dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica gel chromatography (methanol/DCM=0/100→5/95) to give 99 mg of the title compound (62% yield). LC/MS (FA) ES+ 393. 1H NMR (300 MHz, CDCl3) δ: 8.72-8.70 (m, 2H), 7.80-7.72 (m, 2H), 7.26 (m, 1H), 7.22-7.14 (m, 4H), 7.06 (m, 1H), 5.84-5.71 (m, 1H), 5.23-5.19 (m, 1H), 5.01-4.96 (m, 1H), 4.38-4.34 (m, 2H), 4.20 (s, 2H).

Provenance & Evidence