Transannular Hydride Migration inPseudo-Geminally Substituted [2.2]Paracyclophanes: A Vinylogous Pinacol Rearrangement
作者:M. Lucian Birsa、Peter G. Jones、Henning Hopf
DOI:10.1002/ejoc.200500093
日期:2005.8
A vinylogous pinacol–pinacolone rearrangement is reported that takes place although the two hydroxyl groups are formally separated by seven bonds. It involves a transannular hydride shift that occurs between the benzylic positions of the pseudo-geminally substituted [2.2]paracyclophanes 1a–c, 7, 8 and 9. Under mild acidic conditions the corresponding pseudo-geminally substituted cyclic ethers were