Synthesis of Furanosyl<i>C</i>-1 Glycals through Palladium-Catalyzed Reactions of a Furanosyl 2,3-Anhydro-<i>exo</i>-glycal
作者:Ana M. Gómez、Ana Pedregosa、Aitor Barrio、Serafín Valverde、J. Cristóbal López
DOI:10.1002/ejoc.200900585
日期:2009.9
A furanose-derived 2,3-anhydro-exo-glycal, readily available from D-mannose in four steps, has proven to be a useful substrate in the preparation of a variety of highly functionalized C-1 glycals. Upon treatment with Pd0 it affords a π-allyl palladium complex that can react with nucleophiles such as amines, ethyl malonate, or vinylstannanes. On the other hand, umpolung of the π-allyl palladium complex
呋喃糖衍生的 2,3-脱水-外-糖基可通过四步从 D-甘露糖中轻松获得,已被证明是制备各种高度官能化的 C-1 糖基的有用底物。用 PdO 处理后,它提供 π-烯丙基钯络合物,可以与亲核试剂如胺、丙二酸乙酯或乙烯基锡烷反应。另一方面,π-烯丙基钯配合物与 Et2Zn 的 umpolung 促进了它与亲电子醛和酮的反应。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)