Facile Access to<i>cis</i>-2,6-Disubstituted Tetrahydropyrans by Palladium-Catalyzed Decarboxylative Allylation: Total Syntheses of (±)-Centrolobine and (+)-Decytospolides A and B
作者:Jing Zeng、Yu Jia Tan、Jimei Ma、Min Li Leow、Davin Tirtorahardjo、Xue-Wei Liu
DOI:10.1002/chem.201303328
日期:2014.1.7
facile synthesis of cis‐2,6‐disubstituted‐3,6‐dihydropyrans as cis‐2,6‐tetrahydropyran precursors has been achieved in high regio‐ and stereoselectivity with high yields. This reaction involves a palladium‐catalyzed decarboxylative allylation of various 3,4‐dihydro‐2H‐pyran substrates. Extending this reaction to 1,2‐unsaturated carbohydrates allowed the achievement of challenging β‐C‐glycosylation. Based
顺式-2,6-四氢吡喃是生物活性天然产物的重要结构骨架。顺式-2,6-二取代-3,6-二氢吡喃前体作为顺式-2,6-四氢吡喃前体的简便合成方法具有很高的区域选择性和立体选择性,且收率很高。该反应涉及各种3,4-dihydro-2 H-吡喃底物的钯催化脱羧烯丙基化。将此反应扩展至1,2-不饱和碳水化合物可实现具有挑战性的β-C-糖基化。基于此方法,只需简单的步骤即可完成(±)-中心叶lob碱和(+)-去细胞肽A和B的总合成。