Abstract
The [4+2] cycloaddition between furan and some dienophiles can be greatly accelerated in the presence of a Lewis-Acid (i.e. ZnI 2. The 7-oxabicyclo [2.2.1] heptyl system readily undergoes a base promoted β-elimination of the heteroatom bridge leading to substituted cyclohexenols and cyclohexadienols.
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