Intramolecular palladium-catalyzed cyclization of methyl 1-(2-bromobenzyl)indole-2-carboxylates: Synthesis of pratosine and hippadine
作者:Yasuyoshi Miki、Hideaki Shirokoshi、Ko-ichi Matsushita
DOI:10.1016/s0040-4039(99)00687-5
日期:1999.6
Palladium-catalyzed cyclization of methyl 1-(2-bromo-4,5-dimethoxy-benzyl)indole-2-carboxylate in the presence of potassium acetate in hot 1,4-dioxane gave a 7H-pyrrolo[3,2,1-de]phenanthridine derivative, which was converted to pratosine in four steps. In a similar manner, hippadine was also prepared.
在热的1,4-二恶烷中,在乙酸钾存在下,钯催化1-(2-溴-4,5-二甲氧基-苄基)吲哚-2-羧酸甲酯的环化反应,得到7 H-吡咯[3,2, 1- de ]菲啶衍生物,通过四个步骤将其转化为普拉托因。以类似的方式,还制备了马卡定。