Low-valent titanium induced indole formation: Syntheses of secofascaplysin, indolopyridocoline and an endothelin-receptor-antagonist
作者:Alois Fürstner、Andreas Ernst、Helga Krause、Arne Ptock
DOI:10.1016/0040-4020(96)00255-4
日期:1996.5
The versatility of a titanium-induced reductive oxo-amide coupling reaction is illustrated by the syntheses of the alkaloids secofascaplysin 8 and indolopyridocoline 14 as well as by an efficient and flexible approach to the arylated indole-2-carboxylic acid 4, which has recently been disclosed as a promising endothelin-receptor-antagonist. Depending on the particular substitution pattern in the substrates
钛诱导的还原性羰基酰胺偶联反应的多功能性由生物碱secofascaplysin 8和吲哚吡咯啉14的合成以及对芳基化的吲哚-2-羧酸4的高效灵活方法得到了说明。公开为有希望的内皮素-受体拮抗剂。取决于基底中的特定取代图案,石墨上的预成型钛或原位形成的低价钛(“即时条件”)是用于这种类型的还原性杂环合成的优选偶联剂。