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
Stereoselection in the chromium mediated intramolecular [2 + 2] cycloadditions of vinyl ketenes and alkenes
作者:Oak K. Kim、William D. Wulff、Weiqin Jiang、Richard G. Ball
DOI:10.1021/jo00073a001
日期:1993.10
The first study of the relative diastereoselectivity of the intramolecular [2 + 2] cycloadditions of alkenes and vinyl ketenes generated from the reactions of carbene complexes with chiral enynes is reported.
BROKA CH. A.; REICHERT D. E. C., TETRAHEDRON LETT., 28,(1987) N 14, 1503-1506