Triethylamine → 1-(3-Chloro-phenyl)-6-(4-iodo-phenyl)-3-methanesulfonyl-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one

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Reaction Conditions

Reaction Steps

The methanehydrazonoyl chloride (8.47 g, 31.7 mmol) and 1-(4-iodo -phenyl)-3-morpholin-4-yl-5,6-dihydro-1H-pyridin-2-one (12.17 g, 31.7 mmol) were combined in anhydrous toluene. The solution heated to 70° C. and triethylamine (13.2 mL, 95.1 mmol) was added dropwise. After the addition was complete the reaction was warmed to 90° C. and stirred at this temperature for 14 h. Analysis by LC/MS indicated formation of 1-(3-chloro-phenyl)-6-(4-iodo-phenyl)-3-methanesulfonyl-7a-morpholin-4-yl-1,3a,4,5,6,7a-hexahydro-pyrazolo[3,4-c]pyridin-7-one complete with less than 5% of 1-(4-iodo-phenyl)-3-morpholin-4-yl-5,6-dihydro-1H-pyridin-2-one remaining. The solvent was removed in vacuo. To the viscous oil was added dichloromethane (50 mL) then trifluoroacetic acid (30 mL) and heated to reflux for 4 h. The solvent was evaporated and the residue purified by flash column chromatography eluting with a gradient of hexane to 40% ethylacetate/hexane to give 10.65 g (64%) of 1-(3-chloro-phenyl)-6-(4-iodo-phenyl)-3-methanesulfonyl-1,4,5,6-tetrahydro-pyrazolo[3,4-c]pyridin-7-one.

Provenance & Evidence