Triphenylphosphine → 7-[2-(N-tert-butoxycarbonyl-N-methylamino)ethoxyl]-2-oxo-2H-1-benzopyran-3-carboxylic acid methyl ester

Beteiligte Stoffe

Reaktionsschritte

2-(N-tert-butoxycarbonyl-N-methylamino)ethanol (0.5 g, 3 mmol) and 7-hydroxyl-3-coumarin carboxylic acid methyl ester (0.6 g, 3 mmol) are dissolved in 60 mL of anhydrous tetrahydrofuran. Triphenylphosphine (1.2 g, 4.5 mmol) is added, and diethyl azodicarboxylate (720 μL, 0.45 mmol) is added dropwise and slowly at 0° C. The resulting solution is stirred at room temperature for 24 hours. After the solvent was removed under reduced pressure at 30° C., the residue is mixed with methanol at room temperature. A solid is produced by filtrating under reduced pressure and 0.83 g of the captioned compound is obtained, yield: 72.6%. m.p. 128-129° C. 1H NMR(DMCO-d6): δ=1.40(s, 9H), 2.96(s, 3H), 3.65(s, 2H), 3.81(s, 3H), 4.32(s, 2H), 6.94(d, J=2.2 Hz, 1H), 7.00(dd, J=2.2 Hz, 8.4 Hz, 1H), 7.80(d, J=8.8 Hz, 1H), 8.60 (s,1H); EI-MS(m/z): 377(1, M+), 102(100).

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