反应详情

5.5 g (15.0 mmol) of t-butyl 4-(4-ethoxycarbonylamino-phenyl)-piperidine-1-carboxylate and 20 g (0.15 mol) of (RS)-4-(methoxymethyl)-1,3-dioxolan-2-one were stirred intensively in the presence of 2.37 g of pyridine for 18 hours at an oil bath temperature of 160°. After cooling the reaction mixture it was chromatographed on 840 g of silica gel 60 with ether. 3.4 g of t-butyl (RS)-4-[4-(5-methoxymethyl-2-oxo-oxazolidin-3-yl)-phenyl]-piperidine-1-carboxylate were obtained as a yellowish oil. 1H-NMR (CDCl3) ppm: 7.48 (d,2H), 7.22 (d,2H), 4.76 (m,1H), 4.25 (bd,2H), 4.05 (t,1H), 3.92 (t,1H), 3.64 (d,2H), 3.43 (s,3H), 2.80 (t,2H), 2.64 (m,1H), 1.78 (bd,2H), 1.61 (m,2H), 1.49 (s,9H).

1. temperatureAfter cooling the reaction mixture it
2. customwas chromatographed on 840 g of silica gel 60 with ether