反应详情

The product of step A was reacted with tert-butyl 4-oxopiperidine-1-carboxylate then Boc protected following the procedure of Example 29, step B. Purification by flash column chromatography (SiO2, 95:5 hexanes/ethyl acetate) provided tert-butyl 6-chloro-8-bromo-3,4-dihydrobenzofuro[3,2-c]pyridine-2(1H)-carboxylate (3.9 g, 20%) as a pink solid: 1H NMR (CDCl3, 300 MHz) δ 7.44 (d, J=1.5 Hz, 1H), 7.38 (d, J=1.5 Hz, 1H), 4.50 (s, 2H), 3.88 (t, J=5.4 Hz, 2H), 2.89 (t, J=5.4 Hz, 2H), 1.49 (s, 9H).

1. customPurification by flash column chromatography (SiO2, 95:5 hexanes/ethyl acetate)