反应条件
1: 95 percent / H2SO4, fuming HNO3 / 2 h / 100 - 105 °C 2: 30 percent / Heating 3: 1) p-TsOH*H2O / 1) MeOH, reflux, 4 h, 2) Et2O, 1 h, 0 deg C 4: 57 percent / DMSO, N,N'-dicyclohexylcarbodiimide, H3PO4 / 1.5 h / Ambient temperature View Scheme
参考文献
Chemical and Pharmaceutical Bulletin, , vol. 38, # 9 p. 2446 - 2458
