Triacetoxyperiodinane → 2-[2-(3-oxo-cyclobutyl)-1,3-benzothiazol-6-yl]-2H-pyridazin-3-one

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Reaction Steps

The product of Example 48C (1.63 g, 5.45 mmole) was dissolved in 50 ml anhydrous dichloromethane. Dess-Martin periodinane (3.0 g, 7.07 mmole, [87413-09-0]) was added. After 3 hours at room temperature, the mixture was diluted with water and extracted three times with dichloromethane. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure to provide the crude product which was purified by column chromatography (0.25% ammonium hydroxide and 2.5% methanol in dichloromethane) to provide the title compound. 1H NMR (300 MHz, CDCl3) δ ppm 8.20 (d, J=2.03 Hz, 1H) 8.07 (d, J=8.82 Hz, 1H) 7.94 (dd, J=3.73, 1.70 Hz, 1H) 7.75 (dd, J=8.82, 2.37 Hz, 1H) 7.26-7.31 (m, 1H) 7.09 (dd, J=9.49, 1.70 Hz, 1H) 4.01-4.15 (m, 1H) 3.54-3.79 (m, 5H). MS: (M+H)+=298.

Provenance & Evidence