A variety of dioxa[4.3.3]propellanes are efficiently
obtained starting from a dehydrotetramer of 2,4-dimethylphenol.
The final installation of the phenol component requires a domino
sequence based on electrophilic substitution and a ketalization
process. The molecular structure of these dioxa[4.3.3]propellanes
was elucidated by 2D NMR techniques as well as X-ray analysis of
suitable single crystals. Most of these polycyclic products were
formed with high regio- and diastereoselectivity.
propellanes - phenols - polycycles - domino
reaction - regioselectivity