Chiral Imidazoline–Phosphine Ligands for Palladium-Catalyzed Asymmetric Allylic Substitutions
作者:Liang-yong Mei、Zhi-liang Yuan、Min Shi
DOI:10.1021/om2008309
日期:2011.12.12
to 96% ee), and chiral ligand L9 can be used for the palladium-catalyzed asymmetric allylic monofluoromethylation of 1,3-diphenylpropenyl acetate with 1-fluorobis(phenylsulfonyl)methane to afford the corresponding product in excellent enantioselectivities (up to 98% ee) and moderate yields under mild conditions. The bidentate N,P-coordination pattern to the Pd atom with ligand L1 has been unambiguously
具有1,1'-双萘骨架的手性咪唑啉-膦配体已被开发为新型的N,P配体。由(R)-(-)-2-(二苯基膦基)-1,1'-联萘基-2'-酸制备的手性配体L1有效影响钯催化的1,3-二芳基乙酸丙烯酯与丙二酸二甲酯的对映选择性烯丙基烷基化以优异的收率和对映选择性(最高ee为96%)提供相应的加合物,以及手性配体L9可用于1,3-二苯基丙烯基乙酸酯与1-氟双(苯磺酰基)甲烷的钯催化的不对称烯丙基单氟甲基化钯反应,制得的产物具有优异的对映选择性(最高ee达98%),在温和条件下产率中等。通过X射线衍射已明确确认了具有配体L1的Pd原子的二齿N,P配位图案。