2,2′-Dipyridyl diselenide (PySeSePy) is the catalyst or activator of choice for the direct reaction of carboxylicacids with azides and trimethylphosphine at room temperature. The mechanism of the process, which is not an aza-Wittig reaction, has been elucidated.
N-Substituted phthalimides can be obtained in very good yields, under essentially neutral conditions, by mixing or heating an alkyl (oraryl) azide, triphenylphosphine, and phthalicanhydride in benzene or toluene, in the presence of a catalytic amount of tetrabutylannionium cyanide. Application of the reaction into the domain of carbohydrates is promising.
nitrene insertion reaction into the β-vinyl C–H bond of acroleins with an electron-rich organic azide was developed. The reaction protocol can produce secondary enaminals in high yield with a broad substrate scope. In the reaction, acid mediated [3 + 2] cycloaddition of organic azides with an acrolein generated intermediate protonated triazolines, which were selectivelydecomposed into enaminals with