The intramolecular type II [3+ 4] cycloaddition between vinylcarbenoids and furans is a practical method for the construction of 5-oxo-10-oxatricyclo [6.2. 1.04, 9] undeca-3, 8 (11)- dienes, containing two anti-Bredt double bonds. These tricyclic systems are well functionalized for eventual elaboration to the natural product CP-263,114. The rhodium- stabilized vinylcarbenoids are generated by dirhodium tetracarboxylate catalyzed ...
