Gold-Catalyzed Synthesis of Quinolines from Propargyl Silyl Ethers and Anthranils through the Umpolung of a Gold Carbene Carbon
作者:Hongming Jin、Bin Tian、Xinlong Song、Jin Xie、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/anie.201606043
日期:2016.10.4
proceeds through a sequential ring opening/1,2‐H‐shift/protodeauration/Mukaiyama aldol cyclization. This method offers a regiospecific and modular access to 2‐aminoquinolines and other quinoline derivatives under mild conditions and with a broad functional‐group tolerance. The conversion is possible on a gram scale, which underlines the synthetic practicability of this methodology. The versatility of the
Sulfilimines as Versatile Nitrene Transfer Reagents: Facile Access to Diverse Aza-Heterocycles
作者:Xianhai Tian、Lina Song、Matthias Rudolph、Frank Rominger、Thomas Oeser、A. Stephen K. Hashmi
DOI:10.1002/anie.201812002
日期:2019.3.11
We herein report the unprecedented synthesis of diverse biologically important aza‐heterocycles by employing sulfilimines as nitrenetransfer reagents. This class of sulfur‐based aza‐ylides had not been successfully used for gold nitrenetransfer before. This work contains an efficient generation of α‐imino gold carbenes by N−S cleavage of sulfilimines. These gold carbenes undergo C−H insertion, cyclopropanation
Enantioselective synthesis of β-amino acid derivatives via nickel-promoted regioselective carboxylation of ynamides and rhodium-catalyzed asymmetric hydrogenation
作者:Nozomi Saito、Iman Abdullah、Kayoko Hayashi、Katsuyuki Hamada、Momoko Koyama、Yoshihiro Sato
DOI:10.1039/c6ob01234e
日期:——
new method for enantioselective synthesis of α-substituted-β-amino acidderivatives. Thus, nickel(0)-promoted carboxylation of ynamide gave the α-substituted-β-aminoacrylate derivative in a highly regioselective manner. Then, rhodium-catalyzed asymmetric hydrogenation of the α-substituted β-aminoacrylate produced the corresponding α-substituted β-amino acidderivative as an optically active form.
Regio- and Stereoselective Synthesis of 2-Amino-1,3-diene Derivatives by Ruthenium-Catalyzed Coupling of Ynamides and Ethylene
作者:Nozomi Saito、Keiichi Saito、Motoo Shiro、Yoshihiro Sato
DOI:10.1021/ol200812y
日期:2011.5.20
A ruthenium-catalyzed hydrovinylation-type cross-coupling of ynamides and ethylene proceeds via ruthenacyclopentene to give 2-aminobuta-1,3-diene derivatives in a highly regioselective manner. It was also demonstrated that 2-aminobuta-1,3-diene derivatives reacted with various dienophiles or singlet oxygen to give a cyclic enamide derivative.