Practical and Selective sp
<sup>3</sup>
C−H Bond Chlorination via Aminium Radicals
作者:Alastair J. McMillan、Martyna Sieńkowska、Piero Di Lorenzo、Gemma K. Gransbury、Nicholas F. Chilton、Michela Salamone、Alessandro Ruffoni、Massimo Bietti、Daniele Leonori
DOI:10.1002/anie.202100030
日期:2021.3.22
also the fine‐tuning of physicochemical and biological properties of drugs, agrochemicals and polymers. We report here a general and practical photochemical strategy enabling the site‐selective chlorination of sp3 C−H bonds. This process exploits the ability of protonated N‐chloroamines to serve as aminium radical precursors and also radical chlorinatingagents. Upon photochemical initiation, an efficient
Chemoselective Alpha‐Deuteration of Amides via Retro‐ene Reaction
作者:Vincent Porte、Giovanni Di Mauro、Manuel Schupp、Daniel Kaiser、Nuno Maulide
DOI:10.1002/chem.202004103
日期:2020.12
A synthetically convenient approach for the direct α‐deuteration of amides is reported. This mechanistically unusual process relies on a retro‐ene‐type process, triggered by the addition of deuterated dimethyl sulfoxide to a keteniminium intermediate, generated through electrophilic amide activation. The transformation displays broad functional‐group tolerance and high deuterium incorporation.
Free Amino Group Transfer via α‐Amination of Native Carbonyls
作者:Minghao Feng、Anthony J. Fernandes、Ana Sirvent、Eleonora Spinozzi、Saad Shaaban、Nuno Maulide
DOI:10.1002/anie.202304990
日期:2023.7.10
An amino group transfer strategy was developed to install free NH2 to the α-position of native carbonyls under mild conditions. The resulting primary α-aminated products are amenable to in situ peptide coupling or Pictet–Spengler cyclization in one-pot procedures. We anticipate this method to provide a general platform towards the synthesis of amines, ultimately opening exciting avenues in the synthesis
Primary resource: Hypervalent iodine-based aminating reagents containing a transferable (diarylmethylene)amino group can be used for the α-amination of simple carbonylcompounds such as esters, amides, and ketones in the presence of a lithium base. The (diarylmethylene)amino groups of the products can be readily modified, thus providing access to primary amines and diarylmethylamines.