Advances in the Synthesis of N-Sulfonyl Amidines

Due to the special gem-nitrogen structure, amidines are important compounds in the synthesis of nitrogen contaning products. As a class of featured amidines, the N-sulfonyl amidines are key intermediates in a number of pivatol organic syntheses, and thus ocuppy significant position in modern organic synthesis. In this context, the research advances on the synthesis of N-sulfonyl amidines are herein reviewed. Based on the key reaction features, the introduction covers the synthetic methods of enamination by tertiary enamine oxidation, amide activation, akyne-azide-amine three-component reaction, enamine carbon-carbon bond functionalization and other related reactions. It is expected that this review will provide guidelines for the reasearch work in related areas.