Propargyl alcohol → N-[(4-chlorophenyl)methyl]-6-(3-hydroxyprop-1-ynyl)-7-methoxy-1-methyl-4-oxo-1,8-naphthyridine-3-carboxamide

Participants

Reaction Steps

N-(4-chlorobenzyl)-6-iodo-7-methoxy-1-methyl-4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamide (250 mg), copper iodide (40 mg) and dichlorobis(triphenylphosphine)palladium (30 mg) are dissolved in a mixture of diethylamine (15 mL) and THF (15 mL). To this is added propargyl alcohol (452 μL). The mixture is heated at reflux for 1 h, cooled to room temperature, diluted with CH2Cl2, washed with 1N HCl, brine, dried (MgSO4) and concentrated in vacuo. The residue is purified by silica gel chromatography (CH2Cl2/MeOH 1/0, 45/1, 19/1, 9/1) and the resulting product is recrystalized from MeOH to afford 144 mg (68%) of N-(4-chlorobenzyl)-6-(3-hydroxy-1-propynyl)-7-methoxy-1-methyl-4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamide. Physical characteristics are as follows: 1H NMR (CDCl3) δ 8.80, 8.60, 7.32, 4.65, 4.57, 4.13, 3.98; IR (diffuse reflectance) 2425, 2350, 2318, 2233, 1921, 1662, 1607, 1551, 1512, 1492, 1465, 1397, 1380, 1292, 809, cm−1; MS (EI) m/z 411 (M+), 244, 86, 84, 80, 79, 78, 65, 63, 61, 51; HRMS (FAB) calcd for C21H18ClN3O4+H1 412.1064, found 412.1067.

Provenance & Evidence