Highly selective coupling-cyclization of 3,4-allenols with aryl iodides via the oxidative
addition-exo-mode oxypalladation-reductive elimination sequence afforded 2,3-dihydrofurans efficiently.
The cyclization mode and the regioselectivity observed for 3,4-allenols are unique
and different from what was reported previously.
alcohols - allenes - furans - palladium - cyclizations