Primary-secondary diamines catalyzed Michael reaction to generate chiral fluorinated quaternary carbon centers
作者:Yingpeng Lu、Gang Zou、Gang Zhao
DOI:10.1016/j.tet.2015.04.103
日期:2015.6
Asymmetric Michaelreactions of α-fluoro-β-ketoesters to nitroolefins have been achieved by using readily accessible primary-secondary diamines as the organocatalysts through enamine activation mode, affording the useful Michael adducts bearing chiral fluorinated quaternary carbon in good yields, with high diastereoselectivities and enantioselectivities (up to 87% yield, >20:1 d.r. and 99% ee).