A metal-free protocol of direct C(sp3)–H cyanation with cyanobenziodoxolones functioning as both cyanating reagents and oxidants was developed. Unactivated substrates, such as alkanes, ethers and tertiary amines, were thereby transformed to the corresponding nitriles in moderate to high yields. Mechanistic studies indicated that the cyanation proceeded with two potential pathways, which is highly dependent
α-Cyanation of Aromatic Tertiary Amines using Ferricyanide as a Non-Toxic Cyanide Source
作者:Alexander M. Nauth、Nicola Otto、Till Opatz
DOI:10.1002/adsc.201500698
日期:2015.11.16
reaction of aromatictertiaryamines with potassium ferricyanide directly provides the useful α-amino nitriles. The inexpensive iron complex functions both as an oxidant and as a cyanidesource. The presence of molecular oxygen speeds up the reaction which can be performed in aqueous tert-butanol or even in ethanol-based mixtures like Tequila. While amine cyanations usually employ highly toxic cyanide sources
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
Acetone Cyanohydrin: A Convenient Alternative of Toxic Sodium Cyanide/Acetic Acid for Oxidative Cyanation of Tertiary Amines
作者:Sanny Verma、Suman L. Jain、Bir Sain
DOI:10.1007/s10562-011-0582-6
日期:2011.6
Acetone cyanohydrin was found to be a facile, convenient and comparatively safer alternative to toxic sodiumcyanide/acetic acid system for generating in situ HCN for the oxidativecyanation of tertiaryamines to α-aminonitriles in high yields with hydrogenperoxideusing RuCl3 as catalyst. In addition organic nature of acetone cyanohydrin makes it more suitable for an organic transformation since