Amine Activation: Synthesis of <i>N</i>-(Hetero)arylamides from Isothioureas and Carboxylic Acids
作者:Yan-Ping Zhu、Sergey Sergeyev、Philippe Franck、Romano V. A. Orru、Bert U. W. Maes
DOI:10.1021/acs.orglett.6b02247
日期:2016.9.16
A novel method for N-(hetero)arylamide synthesis based on rarely explored amine activation, rather than classical acid activation, is reported. The activated amines are easily prepared using a three-component reaction with commercial reagents. The new method shows a broad scope including challenging amides not (efficiently) accessible via classical protocols.
An unusual behaviour of N-(tert-butoxycarbonyl)- and N-pivaloyl-(methylthio)anilines in metallation reactions
作者:Maria Grazia Cabiddu、Salvatore Cabiddu、Enzo Cadoni、Stefania De Montis、Claudia Fattuoni、Stefana Melis
DOI:10.1016/s0040-4020(03)00347-8
日期:2003.4
N-Boc-and N-Piv-(methylthio)anilines are here described. The results show that N-Boc derivatives are metallated only by superbases to give products substituted at the thiomethylic group. N-Piv derivatives show a different behaviour: ortho-derivative is metallated by both butyllithium and superbase at the thiomethylic carbon atom, while para-derivative is metallated in ortho to the N-Piv group by butyllithium
A sulfur-containing auxiliary enabled palladium-catalyzed C(carbonyl)–C bond activation of amides was reported to form phenylcarbamate derivatives with alcohols. Both alkyl and benzyl alcohols could be employed well with yields up to 85%. Derivations from phenylcarbamates to ureas and thiocarbamates illustrated the potential applications of this sequential C–C cleavage/C–O coupling reaction.