[CH3:1][N:2]([CH3:15])[C:3]([C:5]1[N:10]=[C:9]([C:11](OC)=[O:12])[CH:8]=[CH:7][CH:6]=1)=O.[H-].[Al+3].[Li+].[H-].[H-].[H-].[O-]S([O-])(=O)=O.[Na+].[Na+]>O1CCCC1>[CH3:15][N:2]([CH2:3][C:5]1[N:10]=[C:9]([CH2:11][OH:12])[CH:8]=[CH:7][CH:6]=1)[CH3:1]A solution of 6-(N,N-dimethylcarbamyl-2-carbomethoxypyridine (20.3 g; 97.5 mmoles) [prepared in Step A] in 200 ml of tetrahydrofuran was added to a suspension of lithium aluminum hydride (9.6 g; 0.25 moles) in 500 ml of tetrahydrofuran. The mixture was stirred and heated at reflux temperature under a nitrogen atmosphere for 3 hours then left at ambient temperature overnight. The mixture was decomposed with a saturated aqueous solution of Na2SO4, filtered, dried and evaporated under reduced pressure. The residue was placed on 275 g of aluminum oxide and eluted with methylene chloride. The appropriate fractions were combined and evaporated to give 5.2 g of the title compound.
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