[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:16]2[C:11](=[CH:12][CH:13]=[C:14]([CH:19]([N+:21]([O-:23])=[O:22])[CH3:20])[CH:15]=2)[N:10]=1)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH3:7].C=O.[CH3:26][O:27][Na]>C1COCC1.CO>[CH2:1]([O:8][C:9]1[CH:18]=[CH:17][C:16]2[C:11](=[CH:12][CH:13]=[C:14]([C:19]([N+:21]([O-:23])=[O:22])([CH3:20])[CH2:26][OH:27])[CH:15]=2)[N:10]=1)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH3:7]2-(heptyloxy)-6-(1-nitroethyl)quinoline (1.823 g, 5.77 mol) and paraformaldehyde (346 mg, 11.54 mmol, 2.0 eq.) were dissolved in THF (10 mL). CH3ONa (115 mg, 2.13 mmol, 0.37 eq.) in methanol (2 mL) was added to the solution. The mixture was stirred at 80° C. under nitrogen atmosphere for 15 h. The mixture was extracted with ethyl acetate and the organic layer was concentrated and purified by silica gel column chromatography using petroleum/ethyl acetate (5/1) as eluent to give product as a slight red oil (823 mg, 43%). ESI-MS: 347.1 (M+H)+. 1H NMR (400 MHz, CDCl3) δ 7.97 (d, 1H), 7.88 (d, 1H), 7.69 (d, 1H), 7.56 (q, 1H), 6.93 (d, 1H), 4.62 (d, 1H), 4.47 (t, 2H), 3.90 (d, 1H), 2.15 (s, 3H), 1.84-1.80 (m, 2H), 1.49-1.24 (m, 8H), 0.89 (t, 3H).
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