Photoredox-Initiated α-Alkylation of Imines through a Three-Component Radical/Cationic Reaction
作者:Thibaut Courant、Géraldine Masson
DOI:10.1002/chem.201103062
日期:2012.1.9
Radical‐polar crossover reaction: The photoredox‐mediated alkylation of enamides with diethyl bromomalonate in the presence of alcohols has been developed. This multicomponent domino process affords β‐alkylated α‐carbamido ethers as stables imine surrogates in good to excellent yields under mild conditions (see scheme).
Metal-Free Dioxygenation of Enecarbamates Mediated by a Hypervalent Iodine Reagent
作者:Mathieu Bekkaye、Yingpeng Su、Géraldine Masson
DOI:10.1002/ejoc.201300501
日期:2013.7
A general method for the vicinal dioxygenation of enecarbamates was developed by using PhI(OAc)2 as the sole oxidant under extremely mild conditions, thus avoiding starting material decomposition. This methodology, which is an alternative to common dioxygenation processes catalyzed by transition metals, provides easy access to functionalized β-acetoxy-α-amido ethers and α-amido-β-oxytetrahydrofurans
Cerium(IV) Ammonium Nitrate Mediated Three-Component α-Allylation of Imine Surrogates
作者:Mathieu Bekkaye、Géraldine Masson
DOI:10.1021/ol5004143
日期:2014.3.7
A general and practical CAN-mediated oxidative radical alpha-coupling reaction of various imine surrogates with allylsilanes has been described. This multicomponent process affords beta-allylated alpha-carbamido ethers as stable imine precursors in respectable yields under mild conditions.
Highly Enantioselective Intermolecular Iodo- and Chloroamination of Enecarbamates Catalyzed by Chiral Phosphoric Acids or Calcium Phosphate Salts
Highly enantio- and diastereoselective vicinal chloro- and iodoamination reaction of enecarbamates catalyzed by chiral phosphoric acids or chiral calcium organophosphates are reported. The approach described herein provides efficient access to cis-chloro and cis-iodoaminals in good yields and excellent enantioselectivities (up to 99% ee). The resulting products are converted readily into highly important trans-azidoaminals.