HCID 69312679, compound → HCID 15565856, compound

Participants

Reaction Steps

A solution of 7-chloro-4-(4-methoxybenzyl)-5-oxo-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid ethyl ester (55) (10.40 g, 27.5 mmol) in neat TFA was heated at 70° C. under argon for 36 h. The solution was cooled and poured into ice water. The solids formed were filtered, washed by water, and dried to yield 7.08 g (99%) of 7-chloro-5-oxo-4,5-dihydro-thieno[3,2-b]pyridine-6-carboxylic acid ethyl ester as white solids. MP 206° C.; 1H NMR (400 MHz, DMSO-d6) δ 1.28 (t, J=7.2 Hz, 3H), 4.29 (q, J=7.2 Hz, 2H), 7.10 (d, J=5.2 Hz, 1H), 8.13 (d, J=5.2 Hz, 1H) ppm; MS m/z=240 amu (M++1).

Provenance & Evidence