反应详情

To a solution of triphenylphosphine (1.03 g, 3.94 mmol) and 1-chloro-3-(3-hydroxypropyl)isoquinolin-4-ol (520 mg, 2.18 mmol) in THF (2 mL) at 0° C. was added diisopropyl azodicarboxylate (0.85 mL, 4.38 mmol) dropwise. The resulting solution was stirred for 4 h at rt. After concentration of solvent, the residue was purified by silica gel chromatography eluting with 0%-20% ethyl acetate in hexane to give the desired product 6-chloro-3,4-dihydro-2H-pyrano[3,2-c]isoquinoline (350 mg, 73%) as a white solid. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.27-8.20 (m, 1H), 8.13 (d, J=8.3 Hz, 1H), 7.73 (ddd, J=8.2, 6.8, 1.3 Hz, 1H), 7.67-7.60 (m, 1H), 4.45-4.31 (m, 2H), 3.07 (t, J=6.5 Hz, 2H), 2.29-2.15 (m, 2H); MS: MS m/z 220.0 (M++1).

1. customAfter concentration of solvent, the residue was purified by silica gel chromatography
2. washeluting with 0%-20% ethyl acetate in hexane