Asymmetric Photocycloadditions with an Optically Active Allenylsilane: Trimethylsilyl as a Removable Stereocontrolling Group for the Enantioselective Synthesis of <i>exo</i>-Methylenecyclobutanes
作者:Mary S. Shepard、Erick M. Carreira
DOI:10.1021/ja963436g
日期:1997.3.1
Allenylsilanes undergo enantioselective intramolecular photocycloaddition reactions with enones and enoates to give adducts in 76−99% enantiomeric excess and 67−90% yield. The silyl-substituted exo-methylenecyclobutane products undergo protodesilylation to give the parent unsubstituted exo-methylenecyclobutane. Optically active allenylsilanes may thus be used in enantioselective photocycloadditions in