Thermolysis of N-unsaturated alkyl-β-ketoamides. An easy access to spirolactams
摘要:
A facile access to spirolactams based on the thermal rearrangement of N,N-unsaturated dialkyl- and of N-unsaturated alkyl-N-alkyl-beta-ketoamides is presented. (C) 1997 Elsevier Science Ltd.
The oxidative radical cyclization of active methylene derivatives containing allyl groups as radical acceptors proceeded with the use of FeCl3 as a mild oxidant. The FeCl3-promoted cyclization reactions of α-substituted active methylene compounds provide a synthetic approach to various γ-lactams containing a quaternary carbon atom.