Important precursors (1 and 2) for the synthesis of 4-substituted indole derivatives were readily obtained by acid treatment of a tosylamide (13), which was prepared in a single operation by treatment of 10 with N-tosyl-N', N'-dimethylformamidine (TsN=CHNMe2). Compound (10) was effectively synthesezed from nitromethane and acrolein by way of a nitro compound (15). A novel indole formation reaction from the tosyl-amide (13) to gain short access to 4-alkoxyindoles, such as 16, 17, 19, and 21 is presented.
重要的前驱体(1和2)用于合成4-取代
吲哚衍
生物,通过对磺酰胺(13)进行酸处理容易获得,该磺酰胺通过对化合物10进行N-磺酰-N',N'-二甲基甲酰胺(TsN=CHNMe2)处理一次性制备。化合物(10)是通过将
硝基甲烷与
丙烯醛反应合成的,经过
硝基化合物(15)。文中介绍了一种从磺酰胺(13)出发的新型
吲哚形成反应,以便短时间内获得4-烷氧基
吲哚,如化合物16、17、19和21。