acid/base catalytic system, generated from N-methylimidazole (NMI), (R)-1,1‘-bi-2-naphthol [(R)-BINOL], and Ti(OiPr)4, effectively catalyzes the enantioselective alkynylation of aldehydes in the presence of Et2Zn in good yields and excellent enantioselectivities of up to 94% ee at room temperature. The mild reaction conditions make it possible to use functional alkynes in this asymmetric addition.
双
路易斯酸/碱催化系统中,从生成的Ñ甲基
咪唑(NMI),(- [R)-1,1'-二-
2-萘酚[([R)-BINOL],和Ti(O我PR)4,有效地在室温下,在Et 2 Zn存在下,以良好的收率和高达94%ee的优异对映选择性,催化醛的对映选择性炔基化反应。温和的反应条件使得可以在这种不对称加成中使用官能炔。