[1+1+1] Cyclotrimerization for the Synthesis of Cyclopropanes
作者:Srimanta Manna、Andrey P. Antonchick
DOI:10.1002/anie.201600807
日期:2016.4.18
The synthesis of small rings by functionalization of C(sp(3) )-H bonds remains a great challenge. We report for the first time a copper-catalyzed [1+1+1] cyclotrimerization of acetophenone derivatives under mild reaction conditions. The reaction has a broad scope for the stereoselective synthesis of cyclopropanes by trimerization of acetophenone. The developed transformation is based on an extraordinary