1-benzyl-5-methyl-1H-thieno[2,3-d][1,3]oxazine-2,4-dione → 7-Benzyl-4-hydroxy-3-methyl-6-oxo-6,7-dihydro-thieno[2,3-b]pyridine-5-carboxylic acid ethyl ester

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Reaction Steps

This compound was prepared from 1-benzyl-5-methyl-1H-thieno[2,3-d][1,3]oxazine-2,4-dione (59) by applying the same method described for the preparation of 7-benzyl-4-hydroxy-6-oxo-6,7-dihydro-thieno[2,3-b]pyridine-5-carboxylic acid ethyl ester (60). Yield 80%; MP 166° C. 1H-NMR (DMSO-d6): δ 1.32 (t, J=6.8 Hz, 3H), 2.40 (d, J=1.2 Hz, 3H), 4.36 (q, J=6.8 Hz, 2H), 5.22 (s, 2H), 6.84 (d, J=1.2 Hz, 1H), 7.25 (m, 3H), 7.32 (m, 2H), 14.04 (b, 1H) ppm; EIMS m/z 344 (M+1).

Provenance & Evidence