A new methodology useful for preparation of indole derivatives bearing a 2-(dialkylamino)-ethyl substituent at the 3-position has been developed. Application of this methodology to the synthesis of N,N-dimethyl-2-5-[(1H-1,2,4-triazol-1-yl)methyl]-1H-indol-3-yl}ethan-1-amine (rizatriptan; 3) is described. The key reaction step is based on the radical cyclization of N-[4-(dimethylamino)but-2-yn-1-yl]-N-2-iodo-4-[(1H-1,2,4-triazol-1-yl)methyl]phenyl}-acetamide (21), easily available by the Mannich reaction, and subsequent isomerization of the primarily formed methylidene derivative 22.
已经开发出一种新的方法,适用于制备在3位带有2-(二烷基氨基)-乙基取代基的吲哚衍生物。将这种方法应用于合成N,N-二甲基-2-5-[(1H-1,2,4-三唑-1-基)甲基]-1H-吲哚-3-基}乙烷-1-胺(利扎曲普坦;3)的描述。关键的反应步骤是基于N-[4-(二甲基氨基)丁-2-炔-1-基]-N-2-碘-4-[(1H-1,2,4-三唑-1-基)甲基]苯基}乙酰胺(21)的自由基环化,该化合物通过Mannich反应容易获得,随后是对最初形成的甲基亚甲基衍生物22的异构化。