Decarbonylative Radical Coupling of α-Aminoacyl Tellurides: Single-Step Preparation of γ-Amino and α,β-Diamino Acids and Rapid Synthesis of Gabapentin and Manzacidin A
coupling method has been developed for the single‐step generation of various γ‐amino acids and α,β‐diamino acids from α‐aminoacyl tellurides. Upon activation by Et3B and O2 at ambient temperature, α‐aminoacyl tellurides were readily converted into α‐amino carbon radicals through facile decarbonylation, which then reacted intermolecularly with acrylates or glyoxylic oxime ethers. This mild and powerful
A new synthesis of α-fluoro-α,β-unsaturated ketones and esters based on organoselenium methodology
作者:Yoshinosuke Usuki、Michio Iwaoka、Shuji Tomoda
DOI:10.1039/c39920001148
日期:——
Fluoroselenenylation of α-diazoketones and α-diazoesters using a phenylselenenyl fluoride equivalent, generated in situ from phenylselenenyl bromide and AgF, followed by oxidation with hydrogen peroxide, provided α-fluoro-α,β-unsaturated ketones and ester, respectively, in moderate yields.
Catalytic Enantioselective Cyclopropanation of α-Fluoroacrylates: An Experimental and Theoretical Study
作者:Amandine Pons、Vincent Tognetti、Laurent Joubert、Thomas Poisson、Xavier Pannecoucke、André B. Charette、Philippe Jubault
DOI:10.1021/acscatal.9b00354
日期:2019.3.1
Herein, we report the catalytic asymmetric synthesis of functionalized fluorocyclopropanes from α-fluoroacrylates. The method using Rh2((S)-TCPTTL)4 allowed the difficult reaction of an in situ-generated electrophilic Rh-carbene with an electron-poor α-fluoroacrylate. The desired fluorocyclopropanes were obtained in good yields, excellent dr and ee. Finally, the mechanism of this transformation was
Two alpha-fluoro alpha,beta-unsaturated carbonyl compounds, i.e., benzyl 2-fluoroacrylate (3) and 2-fluorooct-1-en-3-one (4), as well as the corresponding nonfluorinated parent compounds, were synthesized and subjected to Diels-Alder reactions with cyclopentadiene. The cycloadditions were conducted thermally, microwave-assisted, and Lewis acid-mediated (TiCl(4)). The fluorinated dienophiles exhibited
Synthesis of 2-fluoro analog of 6-aminonorbomane-2,6-dicarboxylic acid, a conformationally restricted analog of glutamic acid, in optically pure form is described.