Aminoketyl Radicals in Organic Synthesis: Stereoselective Cyclization of Five- and Six-Membered Cyclic Imides to 2-Azabicycles Using SmI2–H2O
摘要:
Synthetic application of aminoketyl radicals [R-C-center dot(O-)NR'R ''] formed by a direct electron capture into the amide bond is limited. Herein, we demonstrate addition of aminoketyl radicals to unactivated alkenes using SmI2-H2O as a crucial promoter based on the generic five- and six-membered imide template. Notably, this method enables direct access to aminoketyl radicals with wide-ranging applications in synthesis for the formation of C-C bonds adjacent to nitrogen via polarity reversal.
Catalytic Enantio- and Diastereoselective Alkylations with Cyclic Sulfamidates
作者:Thomas A. Moss、Beatriz Alonso、David R. Fenwick、Darren J. Dixon
DOI:10.1002/anie.200905329
日期:2010.1.12
Open for business: The enantio‐ and diastereoselective nucleophilic ring opening of five‐membered and six‐membered cyclicsulfamidates under asymmetric phase‐transfer catalysis is presented. A range of pro‐nucleophiles have been successfully alkylated in good yields and in good to excellent enantioselectivites.
Catalytic Asymmetric Alkylation Reactions for the Construction of Protected Ethylene-Amino and Propylene-Amino Motifs Attached to Quaternary Stereocentres
作者:Thomas A. Moss、David M. Barber、Andrew F. Kyle、Darren J. Dixon
DOI:10.1002/chem.201203825
日期:2013.2.25
An efficient catalytic and stereoselective method for the direct construction of protected ethylene‐amino and propylene‐amino scaffolds attached to quaternary stereocentres is reported. Preliminary investigations revealed a mild base catalysed nucleophilic ring opening of N‐sulfonyl aziridines using the commercially available phosphazene base 2‐tert‐butylimino‐2‐diethylamino‐1,3‐dimethyl‐perhydro‐1
Aminoketyl Radicals in Organic Synthesis: Stereoselective Cyclization of Five- and Six-Membered Cyclic Imides to 2-Azabicycles Using SmI<sub>2</sub>–H<sub>2</sub>O
作者:Shicheng Shi、Michal Szostak
DOI:10.1021/acs.orglett.5b02732
日期:2015.10.16
Synthetic application of aminoketyl radicals [R-C-center dot(O-)NR'R ''] formed by a direct electron capture into the amide bond is limited. Herein, we demonstrate addition of aminoketyl radicals to unactivated alkenes using SmI2-H2O as a crucial promoter based on the generic five- and six-membered imide template. Notably, this method enables direct access to aminoketyl radicals with wide-ranging applications in synthesis for the formation of C-C bonds adjacent to nitrogen via polarity reversal.