By utilizing amino allenes, aldehydes, and aryl iodides as readily available building blocks, a simple and modular synthesis of multisubstituted pyridines with flexible control over the substitution pattern has been achieved. The method employs a two-step procedure involving the preparation of "skipped" allenyl imines and a subsequent palladium-catalyzed cyclization.
A novel and facile iron-catalyzed cyclization of ketoximeacetates and aldehydes for the green synthesis of substituted pyridines has been developed. In the presence of a FeCl3 catalyst, the reaction...
An efficient, noble-metal-free formal [4+2] cycloaddition reaction between ketones and imines was developed for synthesizing poly-substituted pyridines, whereby two sequential C−C bonds are formed.