化学合成。
化学合成
合成路线 1（1. 合成：2632-10-2）
产率：95%
合成条件：With N-Bromosuccinimide; toluene-4-sulfonic acid In acetonitrile at 80℃; for 5 h;
实验步骤：向化合物ii-c-2（18.8g，0.1mol，1.0当量）的乙腈（100ml）溶液中加入对甲苯磺酸（25.8g，0.15mol，1.5当量）和N-溴代琥珀酰亚胺（17.7）。 g，0.1mol，1.0eq。），将反应溶液在80℃回流5小时。萃取有机相并浓缩，通过硅胶柱色谱法得到标题化合物ii-2（产率95％）。
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