Diacylamines acylamines

Trimethylsilylketene reacts smoothly with u./V-diarylnitrones to give oxoin-doles in good yields. On the other hand, the reaction of trimethylsilylketene with N-arylmethylnitrones gives a mixture of N,N-diacylamines and N-acylamines (Scheme 2.315) (836). 

Alkoxy acylamines Diacylamines l,l -Di(alkoxy)amines Dicarboxylic acid imides a-Hydroperoxynitriles (30) Nitroacetylenes... 

Conversion of an amine into a substituted amide is a convenient and widely used method for the protection of amino groups. Monoacylation of a primary amine often affords sufficient protection, i.e., against oxidation, alkylation, etc., and more complete protection is obtained by forming cyclic diacyl derivatives. Acyclic diacylamines easily revert to mono-acylamines and have only been used under very mild conditions [20]. Of the simple acylamines in common use the stability increases in the order formyl < acetyl < benzoyl and many more complex acyl groups have been evaluated in order to adjust the stability of the derivatives for various purposes. 

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