反应详情

Following the procedure as described in Preparation 5, making variations as required to replace (S)-ethyl 4-methyl-2-(4-methyl-2-oxoimidazolidin-1-yl)thiazole-5-carboxylate and with ethyl 4-methyl-2-(2-oxoimidazolidin-1-yl)thiazole-5-carboxylate to react with 4-bromobut-1-ene, the title compound was obtained as an off-white solid (2.05 g, 85%): mp 97-98° C. (diethyl ether); 1H NMR (300 MHz, DMSO-d5) δ 5.86-5.72 (m, 1H), 5.16-5.02 (m, 2H), 4.22 (q, J=7.1 Hz, 2H), 4.02-3.79 (m, 2H), 3.60-3.55 (m, 2H), 3.34-3.29 (m, 2H), 2.51 (s, 3H), 2.33-2.26 (m, 2H), 1.27 (t, J=7.1 Hz, 3H); MS (ES+) m/z 309.8 (M+1).

1. customas described in Preparation 5