Palladium(0)-catalysed cyclisation of the appropriate hydroxy allylic carbonates in THF allowed the formation of tetrahydrofurans and pyrans via a 5-exo-trig or a 6-exo-trig mechanism; preliminary experiments in the presence of palladium complexes associated with chiral ligands gave the expected substituted tetrahydrofurans with low enantioselectivities.
C. Fournier-Nguefack, P. Lhoste and D. Sinou, J. Chem. Res. (S), 1998, 105 DOI: 10.1039/A707902H
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