The three-component addition of isocyanides to phenol derivatives and aldehydes proceeds easily in methanol to form O-arylated compounds in a new Passerini-type reaction. The key step of the conversion lies in an irreversible Smilesrearrangement of intermediate phenoxyimidate adducts. It represents the first use of a Smilesrearrangement in a Passerini reaction. [reaction: see text]
Smiles Rearrangements in Ugi- and Passerini-Type Couplings: New Multicomponent Access to <i>O</i>- and <i>N</i>-Arylamides
作者:Laurent El Kaïm、Marie Gizolme、Laurence Grimaud、Julie Oble
DOI:10.1021/jo070202e
日期:2007.5.1
Smiles rearrangement in Ugi- and Passerini-type couplings with electron-deficient phenols allows very straightforward multicomponent formation of O-aryl- and N-arylamides. Best yields were observed with the highly activated o- and p-nitrophenols, salicylic derivatives giving adducts in lower yields. The scope of these new reactions is further increased by the successful couplings of heterocyclic phenols