An efficient palladium-catalyzed cascade reaction of azides with isonitrile and amines
is presented; it offers an alternative facile approach toward N-sulfonyl-, N-phosphoryl-, and N-acyl-functionalized guanidines in excellent yield. These series of substituted guanidines
exhibit potential biological and pharmacological activities. In addition, the less
reactive intermediate benzoyl carbodiimide could be isolated by silica gel column
flash chromatography in moderate yield.
Key words
sulfones - phosphorus - azides - functionalized guanidines - palladium catalysis