Synthesis of Naturally Occurring Pyridine Alkaloids via Palladium-Catalyzed Coupling/Migration Chemistry
作者:Yao Wang、Xiaoyang Dong、Richard C. Larock
DOI:10.1021/jo026716p
日期:2003.4.1
The palladium-catalyzed cross-coupling of 3-iodopyridine, long-chain terminal dienes, and benzylic amines or tosylamides provides a novel route to key intermediates for the synthesis of the naturally occurring, biologically active pyridine alkaloids theonelladins C and D, niphatesine C, and xestamine D. This process involves (1) oxidative addition of the heterocyclic iodide to Pd(0), (2) carbopalladation
3-碘吡啶,长链末端二烯和苄基胺或甲苯磺酰胺的钯催化交叉偶联为合成天然存在的,具有生物活性的吡啶生物碱茶碱菌素C和D,亚硝酸盐C,该过程涉及(1)将杂环碘化物氧化加成到Pd(0)上,(2)受阻最小的二烯碳-碳双键的碳钯反应,(3)钯迁移,和(4)pi氮亲核试剂取代α-烯丙基钯,同时再生Pd催化剂。随后的氢化和脱保护提供了天然产物的良好产率。