Regio- and Stereocontrolled Palladium-Catalyzed Allylic Substitution on N-Acetylneuraminic Acid Derivatives
作者:Chih-Wei Chang、Stéphanie Norsikian、Regis Guillot、Jean-Marie Beau
DOI:10.1002/ejoc.200901452
日期:2010.4
stoichiometric preparation and study of the highly probable complexes involved in the catalytic reaction. Reactions of this type were also applied to other nucleophiles for the construction of C-C, C-N, and C-O bonds, leading to the major formation of the C-4 regioisomers. The selective transformation of some of the substitution products provided easy access to a variety of modified sialic acid derivatives
已开发出一种高效的区域选择性和立体选择性钯催化烯丙基取代 N-乙酰神经氨酸 (Neu5Ac2en) 的 2,3-不饱和衍生物的方法。我们表明烯丙基化反应的效率取决于起始材料上合适的保护基团,并且丙二酸钠阴离子作为亲核试剂,区域选择性可以通过与钯配合物相关的配体的性质进行微调。这些结果可以通过化学计量制备和催化反应中涉及的极可能配合物的研究来解释。这种类型的反应也应用于其他亲核试剂以构建 CC、CN 和 CO 键,导致 C-4 区域异构体的主要形成。