8-Aminoquinoline (AQ) is a widely used bidentate auxiliary in metal-catalyzed directed C-H functionalization reactions. Herein, we report an efficient and chemoselective method to convert various N-quinolyl carboxamides to primary amides with the treatment of a stoichiometric amount of 2-iodoxybenzoic acid oxidant or the combination of a catalytic amount of 2-iodobenzoic acid and Oxone co-oxidant in
Stereoselective Synthesis of β-Alkylated α-Amino Acids via Palladium-Catalyzed Alkylation of Unactivated Methylene C(sp<sup>3</sup>)–H Bonds with Primary Alkyl Halides
作者:Shu-Yu Zhang、Qiong Li、Gang He、William A. Nack、Gong Chen
DOI:10.1021/ja406484v
日期:2013.8.14
We report a new set of reactions based on the Pd-catalyzed alkylation of methylene C(sp(3))-H bonds of aliphatic quinolyl carboxamides with α-haloacetate and methyl iodide and applications in the stereoselective synthesis of various β-alkylated α-amino acids. These reactions represent the first generally applicable method for the catalytic alkylation of unconstrained and unactivated methylene C-H bonds
Synthesis of β-alkynyl α-amino acids via palladium-catalyzed alkynylation of unactivated C(sp3)-H bonds
作者:Bo Wang、Gang He、Gong Chen
DOI:10.1007/s11426-015-5392-z
日期:2015.8
β-Di-substituted α-amino acids (AAs) contain adjacent carbon stereogenic centers and pose considerable synthetic challenge. Complementary to the conventional synthesis strategies based on the transformation of existing functional groups, we envisioned these molecules could be quickly accessed via selective functionalization of sp3 hybridized C-H bonds on the side chains of common α-AA precursors. We report a readily applicable method to prepare β-alkynyl α-amino acids via Pd-catalyzed diastereoselective C(sp3)-H alkynylation of common α-amino acids precursors with acetylene bromide.