Cyclopentene Annulations of Alkene Radical Cations with Vinyl Diazo Species Using Photocatalysis
作者:Francisco J. Sarabia、Qiankun Li、Eric M. Ferreira
DOI:10.1002/anie.201805732
日期:2018.8.20
A direct (3+2) cycloaddition between alkenes and vinyl diazo reagents using either Cr or Ru photocatalysis is described. The intermediacy of a radicalcation species enables a nucleophilic interception by vinyl diazo compounds, a departure from their traditional electrophilic behavior. A variety of cyclopentenes are synthesized using this method, and experimental insights implicate a direct cycloaddition
Use of a palladium(II)-catalyzed oxidative kinetic resolution in synthetic efforts toward bielschowskysin
作者:Michael E. Meyer、John H. Phillips、Eric M. Ferreira、Brian M. Stoltz
DOI:10.1016/j.tet.2013.02.034
日期:2013.9
Progress toward the cyclobutane core of bielshowskysin is reported. The core was thought to arise from a cyclopropane intermediate via a furan-mediated cyclopropane fragmentation, followed by a 1,4-Michael addition. The synthesis of the cyclopropane intermediate utilizes a Suzuki coupling reaction, an esterification with 2-diazoacetoacetic acid, and a copper catalyzed cyclopropanation. An alcohol intermediate within the synthetic route was obtained in high enantiopurity via a highly selective palladium(II)-catalyzed oxidative kinetic resolution (OKR). (C) 2013 Elsevier Ltd. All rights reserved.
2-Diazoacetoacetic acid, an efficient and convenient reagent for the synthesis of α-diazo-β-ketoesters
作者:Michael E. Meyer、Eric M. Ferreira、Brian M. Stoltz
DOI:10.1039/b517719g
日期:——
The formation of various alpha-diazo acetoacetic esters can be obtained in a single transformation with good to excellent yields using readily available 2-diazoacetoacetic acid.