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
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]
Lewis acid-catalyzed formation of Ugi four-component reaction product from Passerini three-component reaction system without an added amine
作者:Wei-Min Dai、Huoming Li
DOI:10.1016/j.tet.2007.10.050
日期:2007.12
In the presence of a Lewis acid the phenol-Passerini three-component reaction (phenol-P-3CR) system is found to deliver a product of the phenol-Ugi four-componentreaction (phenol-U-4CR). It is the first demonstration of an isocyanide as an amine equivalent in isocyanide-based multicomponent reactions (IMCRs). In general, by using Ti(O-i-Pr)4 in MeOH both phenol-U-4CR and U-4CR products are synthesized
Optimized Conditions for Passerini-Smiles Reactions and Applications to Benzoxazinone Syntheses
作者:Elodie Martinand-Lurin、Aurélie Dos Santos、Emmanuelle Robineau、Pascal Retailleau、Philippe Dauban、Laurence Grimaud、Laurent El Kaïm
DOI:10.3390/molecules21091257
日期:——
new experimental conditions for this coupling between electron-poor phenols, isocyanides, and carbonyl derivatives. These new conditions have been applied to several synthetic strategies towards benzoxazinones.