Intramolecular thermal and catalytic [4+2]-cycloaddition in 2-alkenylfurans
Data on the intramolecular Diels-Alder reaction in the 2-alkenylfuran series are generalised. The methods and conditions for the formation of tricyclic systems are considered. The effect of substituents in the furan and unsaturated fragments on the cycloaddition are discussed. The results of using this reaction for the synthesis of alkaloids and terpenoids are presented.