Catalytic asymmetric nitroaldol reaction of α,α-difluoro aldehydes mediated by rare earth-lithium-BINOL complexes
作者:Katsuhiko Iseki、Satoshi Oishi、Hiroaki Sasai、Masakatsu Shibasaki
DOI:10.1016/s0040-4039(96)02090-4
日期:1996.12
Rare earth-Li-BINOL complexes were used to catalyze nitroaldol reactions of α,α-difluoro adehydes with nitromethane in a good enantioselective manner. The optical yields of nitroaldol 2a depend on the size of rare earth metals, and an Sm-Li-BINOL complex gave the highest enantioselectivity. The enantiotopic face selection of α,α-difluoro aldehyde 1a was found to be different from that of nonfluorinated
稀土-Li-BINOL配合物用于催化α,α-二氟乙醛与硝基甲烷的硝基醛反应,具有良好的对映选择性。硝基醛2a的旋光产率取决于稀土金属的大小,Sm-Li-BINOL配合物的对映选择性最高。发现α,α-二氟醛1a的对映体表面选择不同于通常的催化不对称硝基醛醇反应中使用的非氟化醛的对映体选择。