Highly Enantioselective Synthesis of γ-Nitro Heteroaromatic Ketones in a Doubly Stereocontrolled Manner Catalyzed by Bifunctional Thiourea Catalysts Based on Dehydroabietic Amine: A Doubly Stereocontrolled Approach to Pyrrolidine Carboxylic Acids
作者:Xianxing Jiang、Yifu Zhang、Albert S. C. Chan、Rui Wang
DOI:10.1021/ol8025268
日期:2009.1.1
class of dehydroabietic amine-substituted primary amine-thiourea bifunctional catalysts were designed and synthesized. The doubly stereocontrolled organocatalytic conjugateaddition of a variety of heterocycles-bearing ketones to nitroalkenes was investigated for the first time, affording (S)- or (R)-γ-nitro heteroaromatic ketones with excellent enantioselectivities (up to ee >99%). Furthermore, the nearly
Enantioselective Nickel-Catalyzed Michael Additions of 2-Acetylazaarenes to Nitroalkenes
作者:Alain J. Simpson、Hon Wai Lam
DOI:10.1021/ol400578c
日期:2013.6.7
2-Acetylazaarenes undergo catalytic enantioselective Michaeladditions to nitroalkenes in the presence of a chiral Ni(II)–bis(oxazoline) complex. The process is tolerant of a range of azines or azoles in the pronucleophilic component, resulting in Michael products in moderate to high enantioselectivities.