Hydrochloric Acid → 4-[(2-chloro-1,3-thiazol-5-yl)methyl]-7-hydroxy-6-(7-hydroxy-1,1-dioxido-4H-1,2,4-benzothiadiazin-3-yl)thieno[3,2-b]pyridin-5(4H)-one

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Reaction Steps

The product of Example 307D (0.235 g 0.36 mmol.) in tetrahydrofuran (10 mL) was reacted with tetrabutylamonium fluoride in tetrahydrofuran (1M, 0.43 mL) at 25° C. for 2 hours. The reaction mixture was diluted with water (50 mL) and adjusted to pH 2 with 1 M HCl and extracted with ethyl acetate. The organic layer was concentrated under reduced pressure to give the title compound (0.15 g, 84%). MS (ESI−) m/z 493 (M−H)−. The sodium salt of the title compound was prepared according to the procedure of Example 1D. 1H NMR (300 MHz, DMSO-d6)δ ppm 5.63 (s, 2 H) 7.17 (s, 1 H) 7.20 (d, J=2.57 Hz, 1 H) 7.57 (d, J=8.82 Hz, 1 H) 7.85 (d, J=5.52 Hz, 1 H) 7.95 (s, 1 H) 8.42 (d, J=5.15 Hz, 1 H) 10.42 (s, 1 H) 13.95 (s, 1H) 15.10 (s, 1 H).

Provenance & Evidence