Transposition reactions oxygen-nitrogen

The 1,3-transposition of oxygen and nitrogen functions by [3.3] sigmatropic rearrangement has found extensive application in the synthesis of allylic amines or amides. These reactions can be classified as 3-aza-l-oxa-Cope or aza-Claisen rearrangements. They are thermodynamically favorable for the transformation of an imidate to an amide. 

Not a 3,3-sigmatropic but an Swi-like reaction is involved in an oxygen-nitrogen transposition which allows the introduction of a secondary amine function (Scheme 30). °... 

Chemical Reactions.— Photolysis of 1,2-benzisothiazole cleaves the S—N bond, yielding bis(2-cyanophenyl) disulphide (12%). In contrast to the behaviour of the oxygen and nitrogen analogues (benzo[[Pg.347]

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