hydride in MeCN followed by treatment with alkylating reagents. The developed alkylation method was applied to the preparation of hardly available 2-alkylsemicarbazides and their hydrochlorides from semicarbazide hydrochloride. This general and efficient protocol is based on preparation of acetone semicarbazone, its alkylation, and hydrolysis under mild conditions.
已经描述了基于缩
氨基
脲的选择性 N2-烷基化的 2-烷基缩
氨基
脲的合成。该合成包括在 MeCN 中用氢化
钠对缩
氨基
脲去质子化,然后用烷基化试剂处理。将开发出的烷基化方法应用于制备难获得的2-烷基
氨基
脲及其盐酸盐的
氨基
脲盐酸盐。这种通用且有效的方案基于
丙酮缩
氨基
脲的制备、其烷基化和在温和条件下的
水解。