Photoredox-Catalyzed C<sub>α</sub>–H Cyanation of Unactivated Secondary and Tertiary Aliphatic Amines: Late-Stage Functionalization and Mechanistic Studies
作者:Ozgur Yilmaz、Martins S. Oderinde、Marion H. Emmert
DOI:10.1021/acs.joc.8b01700
日期:2018.9.21
general, high-yielding amine Cα–H cyanation protocol via photoredox catalysis. Inexpensive NaCN is employed as the cyanidesource and air is the external oxidant, resulting in mild and highly functional group tolerant conditions. Notably, efficient Cα–H cyanations of secondary and tertiary aliphatic amines and of complex, biologically active compounds (drugs) can be performed using the established methodology
Iron-Catalyzed α-C–H Cyanation of Simple and Complex Tertiary Amines
作者:Ozgur Yilmaz、Cagatay Dengiz、Marion H. Emmert
DOI:10.1021/acs.joc.0c02642
日期:2021.2.5
cyanation of tertiary amines and its application in late-stage functionalization. Suitable substrates include tertiary aliphatic, benzylic, and aniline-type substrates and complex substrates. Functional groups tolerated under the reaction conditions include various heterocycles and ketones, amides, olefins, and alkynes. This broad substrate scope is remarkable, as comparable reaction protocols for
of phosphonates with opticallyactive lactol 1 lead preferentially to one diastereoisomer. 2. Force field calculations conducted on one pair of diastereoisomers 2c and 2′c predict that these isomers must exist in different conformations of similar energies. 1H NMR data are in good agreement with these predictions. The dihydrofurans obtained by retro Diels-Alder reactions of 2 are easily transformed
Photocatalytic reaction of 4-cyanopyridine with tertiary amines
作者:Aleksey Yu. Vorob’ev
DOI:10.1007/s10593-019-02423-7
日期:2019.1
The reaction of 4-cyanopyridine with tertiary aliphatic amines photocatalyzed by fac-tris[2-phenylpyridinato-C2,N]iridium(III) complex was studied. The reactions led to arylation of the α-C–H bond of the amine to form the corresponding pyridin-4-yl derivatives along with unsubstituted pyridine.
Oxidation of Trialkylamines by BrCCl<sub>3</sub>
: Scope, Applications and Mechanistic Aspects
作者:Alexander M. Nauth、Julio Cesar Orejarena Pacheco、Stefan Pusch、Till Opatz
DOI:10.1002/ejoc.201701320
日期:2017.12.15
In the absence of any photocatalyst, BrCCl3 carries out the visible‐light‐mediated photooxidation of trialkylamines. Depending on the amine, the additive, and the reaction conditions, α‐aminonitriles, streptocyanines, or hydrohalide salts are formed. An investigation of the nature of the reaction is presented, as well as a mechanistic study based on DFT calculations and experimental observations.