3-Hydroxypyridine → 2-tert-Butyl-5-phenyl-4-{[2-(pyridin-3-yloxy)ethyl]amino}isothiazol-3(2H)-one 1,1-dioxide

Participants

Reaction Conditions

Reaction Steps

2-[(2-tert-Butyl-1,1-dioxido-3-oxo-5-phenyl-2,3-dihydroisothiazol-4-yl)amino]ethyl 4-methylbenzenesulfonate (150 mg, 0.313 mmol) was dissolved in dry MeCN (3 mL) under nitrogen atmosphere. Pyridin-3-ol (33 mg, 0.345 mmol) was added followed by potassium carbonate (217 mg, 1.567 mmol). The reaction mixture was heated in a microwave reactor at 120° C. for 15 mins. Potassium carbonate was filtered off and the reaction mixture was evaporated to dryness in a vacuum centrifuge. The crude product was purified by preparative HPLC affording the title compound (46 mg, 35.7%). 1H NMR (CDCl3, 500 MHz): δ 1.74 (s, 9H), 3.30 (q, 2H), 3.92 (t, 2H), 5.64 (t, 1H), 7.12-7.14 (m, 1H), 7.22-7.24 (m, 1H), 7.46-7.48 (m, 3H), 7.53-7.55 (m, 2H), 8.26-8.28 (m, 2H); 13C NMR (CDCl3, 125 MHz): δ 27.84, 43.32, 61.90, 66.37, 108.51, 121.55, 124.15, 125.03, 129.09, 130.10, 131.69, 135.11, 137.90, 143.23, 154.51, 159.64; Mass Spectrum: M+H+ 402.1.

Provenance & Evidence