Synthesis of Macrocyles by Ring Enlargement of 14‐Membered Cyclic ImidesIn the presence of a base, cyclododecanone derivative2, activated in α‐position by an allyloxycarbonyl group, underwent ring enlargement with isocyanates to give 14‐membered imides (Schemes 1–3). Cleavage of the activating group gave new 14‐membered imides which could be transformed by further ring‐enlargement reactions into new macrocycl