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
A very simple one-step, environmentally friendly procedure for the synthesis of α-aminonitriles from aldehydes and ketones, using trimethylsilyl cyanide in the absence of solvent, is reported. The active catalyst of this three-component (Strecker) reaction was the amine employed in the transformation. In general, aldehydes react more rapidly than ketones and give almost quantitative yields of the corresponding α-aminonitriles in less than fifteen minutes. However, only cyclic ketones afford the corresponding α-aminonitriles in excellent chemical yields under these conditions.
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
Trifluoroethanol as a metal-free, homogeneous and recyclable medium for the efficient one-pot synthesis of α-amino nitriles and α-amino phosphonates
作者:Akbar Heydari、Samad Khaksar、Mahmood Tajbakhsh
DOI:10.1016/j.tetlet.2008.10.106
日期:2009.1
Trifluoroethanol is found to be an efficient and recyclable medium in promoting one-pot, three-component coupling reactions of aldehydes or ketones, amines and trimethylsilyl cyanide or trimethylphosphite to afford the corresponding α-amino nitriles or α-amino phosphonates in high yields. This protocol does not require the use of an acid or base catalyst.
Synthesis of α–amino nitriles through Strecker-type reaction using SO3H -functionalized ionic liquid as a homogeneous and water tolerant-acidic catalyst
作者:Jafar Akbari
DOI:10.1016/j.crci.2011.12.005
日期:2012.6
Résumé Task-specific ionic liquid (TSIL) bearing a sulfonic acid group in imidazolium cation (10 mol %), was found to be an effective catalyst for a Strecker-type reaction in water at room temperature. A wide variety of aldehydes/ketones, amines and TMSCN as cyanide source can be easily transformed into the corresponding α-amino nitriles. The water tolerant catalyst could be recycled five times without loss of any activity.