Enantioselective Nickel-Catalyzed Michael Additions of Azaarylacetates and Acetamides to Nitroalkenes
作者:Charlene Fallan、Hon Wai Lam
DOI:10.1002/chem.201202093
日期:2012.9.3
Put a nickel in it: Azaarylacetates and acetamides, which have been neglected as substrates in catalytic asymmetric synthesis, undergo highly enantioselective Michael additions to nitroalkenes in the presence of a chiral nickel(II)‐bis(diamine) complex (see scheme; Bn=benzyl, MS=molecular sieves). This process is tolerant of a wide variety of azaarenes in the pronucleophile.
Selective Monoarylation of Acetate Esters and Aryl Methyl Ketones Using Aryl Chlorides
作者:Mark R. Biscoe、Stephen L. Buchwald
DOI:10.1021/ol900295u
日期:2009.4.16
Simple, efficient procedures for the monoarylation of acetate esters and arylmethyl ketones using arylchlorides are presented. Previously, no general method was available to ensure the highly selective monoarylation of these classes of substrates using arylchlorides. Using palladium precatalysts recently reported by our group, these reactions are easily accomplished under mild conditions that tolerate
α-Heteroarylation of Esters, Lactones, Amides, and Lactams by Nucleophilic Aromatic Substitution
作者:Hong C. Shen、Fa-Xiang Ding、Steven L. Colletti
DOI:10.1021/ol060246u
日期:2006.3.1
A mild and efficient alpha-heteroarylation of simple esters and amides was developed via nucleophilic aromatic substitution. The choice of NaHMDS in toluene gave the best results. A tandem a-heteroarylation and hydroxylation protocol using air as the oxidant afforded tertiary alcohols in good yields.