Synthesis of Cyclopropyl-Substituted Furans by Brønsted Acid Promoted Cascade Reactions
作者:J. Stephen Clark、Filippo Romiti、Kirsten F. Hogg、Malai Haniti S. A. Hamid、Sven C. Richter、Alistair Boyer、Joanna C. Redman、Louis J. Farrugia
DOI:10.1002/anie.201500625
日期:2015.5.4
Chloroacetic acidpromotes an efficient and diastereoselective intramolecular cascadereaction of electron‐deficient ynenones to deliver products featuring a 2,3,5‐trisubstituted furan bearing a fused cyclopropyl substituent at the 5‐position. Synthetically relevant polycyclic building blocks featuring rings of various sizes and heteroatoms have been synthesized in high yield using this mild acid‐catalyzed