4-Pyridinecarbothioamide → HCID 66747606, compound

Participants

Reaction Steps

To a solution of ethyl 2-chloro-4-(4-chlorophenyl)-3-oxobutanoate (70.8 g, 257 mmol) in IPA (2.96 L) was added thioisonicotinamide (71.1 g, 515 mmol) and the resulting mixture was refluxed for 3 days. The reaction was cooled and concentrated in vacuo and the residue was partitioned between DCM (300 ml) and saturated sodium bicarbonate solution (200 mL). The layers were separated and the aqueous layer was extracted with DCM (100 mL). The combined DCM layers were washed with brine (100 mL), dried over MgSO4, filtered, and concentrated in vacuo to give crude product which was purified by silica gel chromatography (ethyl acetate/DCM=0/100→40/60) followed by recrystallization from ethyl acetate/hexanes to give 33 g of the title compound as yellow crystals. (36% yield). LC/MS (FA) ES+ 359. 1H NMR (400 MHz, CDCl3) δ: 8.74-8.72 (m, 2H), 7.81-7.80 (m, 2H), 7.36-7.32 (m, 2H), 7.27-7.23 (m, 2H), 4.54 (s, 2H), 4.38 (q, 2H, J=7.2 Hz), 1.40 (t, 3H, J=7.2 Hz).

Provenance & Evidence