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  • Title: Fused tetracycles with a benzene or cyclohexadiene core: [2 + 2 + 2] cycloadditions on macrocyclic systems.
    Author: Brun S, Garcia L, González I, Torrent A, Dachs A, Pla-Quintana A, Parella T, Roglans A.
    Journal: Chem Commun (Camb); 2008 Sep 28; (36):4339-41. PubMed ID: 18802563.
    Abstract:
    A series of fused tetracycles with a benzene or cyclohexadiene core (2a-h) is satisfactorily prepared by intramolecular [2 + 2 + 2] cycloadditions of triynic and enediynic macrocycles (1a-h) under RhCl(PPh3)3 catalysis; the enantioselective cycloaddition of macrocycles 1b and 1e and gives chiral tetracycles with moderate enantiomeric excess.
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