Authors: Huw M. L. Davies and Xing Dai
J. Am. Chem. Soc.,
2004, 126 (9), 2692–2693
Aluminum chloride induced reaction between cyclopentadiene and α,β-unsaturated aldehydes results in the stereoselective formation of the products of a formal [4 + 3] cycloaddition. The reaction proceeds by a tandem Diels−Alder reaction/ring expansion.