Novel chiral P,N-bidentate arylphosphites have been prepared by a one-step phosphorylation of appropriate hydroxy ketimines based on (R)-(+)-camphor. Metal chelate complexes [Rh(CO)(PN)Cl] and [Pd(PN)(allyl)]BF4 with the ligands were obtained and the new compounds were fully characterized by 1H, 13C and 31P NMR, IR, MS (EI, FAB and ESI techniques) and X-ray crystal structure analysis. Using these ligands, up to 73% ee has been achieved in the asymmetric palladium-catalyzed sulfonylation of 1,3-diphenyl-2-propenyl acetate with sodium p-toluenesulfinate. In the enantioselective alkylation of the same substrate with dimethyl malonate, up to 94% enantioselectivity has been achieved.
通过对以(R)-(+)-
樟脑为基础的适当羟基酮
亚胺进行一步
磷酸化,制备出了新型手性 P,N-二叉芳基膦。通过 1H、13C 和 31P NMR、IR、MS(EI、FAB 和 ESI 技术)和 X 射线晶体结构分析,对这些新化合物进行了全面表征。利用这些
配体,在
对甲苯磺酸钠与
1,3-二苯基-2-丙烯基乙酸酯的不对称
钯催化磺酰化反应中实现了高达 73% 的 ee 值。在同一底物与
丙二酸二甲酯的对映选择性烷基化反应中,对映选择性高达 94%。