Towards new camptothecins. Part 2: Synthesis of the ABCD ring scaffold substituted by a carboxyl group in the 5-position
作者:Thierry Brunin、Jean-Pierre Hénichart、Benoit Rigo
DOI:10.1016/j.tet.2005.06.020
日期:2005.8
In the context of formation of camptothecins substituted by a carbonyl function on position 5 of cycle C, synthesis of a new keto tetrahydroindolizine was realized. This compound was obtained from the reaction of Bredereck's reagent with an indolizine derived from pyroglutamic acid. That yielded a dimethylaminovinyl group whose NaIO4 oxidation gave a ketone. The indolizinone obtained was reacted in
在形成环C的5位上被羰基官能团取代的喜树碱的情况下,实现了新的酮基四氢吲哚嗪的合成。该化合物是从布雷德克试剂与源自焦谷氨酸的吲哚嗪反应而获得的。得到二甲基氨基乙烯基,其NaIO 4氧化生成酮。使所得到的吲哚嗪酮在弗里德兰德条件下反应,得到喜树碱的ABCD环骨架,在5-位上被甲氧基羰基取代。还显示,如果需要的话,不需要在合成序列的开始引入5-羧酰胺基团。