Synthesis of α-aminonitriles via a FeSO4-mediated oxidative cyanation of tertiary amines with benzoyl cyanide and molecular oxygen or TBHP
作者:Lianpeng Zhang、Xin Gu、Ping Lu、Yanguang Wang
DOI:10.1016/j.tet.2016.03.061
日期:2016.5
An iron-mediated oxidative cyanation of tertiaryamines with benzoyl cyanide and molecularoxygen or TBHP has been achieved. This reaction furnished α-cyanated tertiaryamines under mild reaction conditions in good to excellent yields (up to 94%) with great diversity (19 examples). The cascade process involves an iron-catalyzed oxidation of tertiaryamine. Our protocol features safety cyanation reagent
Iron-Catalyzed Generation of α-Amino Nitriles from Tertiary Amines
作者:Alexander Wagner、Wei Han、Peter Mayer、Armin R. Ofial
DOI:10.1002/adsc.201300441
日期:2013.10.11
AbstractThe use of iron(II) chloride as catalyst, trimethylsilyl cyanide as source of cyanide ions, and tert‐butyl hydroperoxide as oxidant enabled the conversion of aromatic, benzylic, and aliphatic tertiary amines into α‐amino nitriles under mild conditions. Chemoselective functionalization of NCH3 to NCH2CN was achieved in the presence of N‐benzyl and N‐alkyl groups. N,N‐Dialkylanilines, PhNR2, with R=Et, Bu, Bn furnished the alkyl(aryl)aminoacetonitriles PhN(R)CH2CN as the main products accompanied by α‐amino nitriles generated by ordinary α‐cyanation of the aniline PhNR2. Formation of PhN(R)CH2CN was rationalized by oxidative degradation of N,N‐dialkylanilines to N‐alkylanilines, their condensation with formaldehyde, generated by oxidation of the solvent methanol, and final trapping of the thus formed iminium ions by cyanide.magnified image