[CH3:1][O:2][C:3]1[N:8]=[C:7]([NH:9][CH:10]([CH2:13][OH:14])[CH2:11][OH:12])[C:6]([N+:15]([O-:17])=[O:16])=[CH:5][CH:4]=1.C(=O)([O-])O.[Na+].CO[C:25](OC)([CH3:27])[CH3:26]>ClCCl.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>[CH3:26][C:25]1([CH3:27])[O:12][CH2:11][CH:10]([NH:9][C:7]2[C:6]([N+:15]([O-:17])=[O:16])=[CH:5][CH:4]=[C:3]([O:2][CH3:1])[N:8]=2)[CH2:13][O:14]1
2-{[6-(Methyloxy)-3-nitro-2-pyridinyl]amino}-1,3-propanediol (53.93 g, 228.7 mmol) was stirred in 2,2-dimethoxypropane (900 ml) under argon and p-toluenesulphonic acid monohydrate (1.00 g) was added. The mixture was stirred at room temperature overnight. This was diluted with dichloromethane (1 L) and the resulting solution was treated with saturated aqueous sodium hydrogen carbonate (20 ml) and solid sodium hydrogen carbonate (20 g) with vigorous stirring (effervescence). The mixture was vigorously stirred for 20 minutes, then the remaining water was absorbed by addition of anhydrous sodium sulphate. The mixture was filtered with suction and the solids were washed with DCM (500 ml). The combined filtrate plus washings were evaporated under reduced pressure to give a yellow solid which was stirred with petroleum ether) (40-60°) over the weekend. The solid was isolated by filtration with suction, washed with petroleum ether) (40-60°) and air-dried to give the title compound as a bright yellow solid 57.83 g, 92%).
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