Asymmetric γ-Deprotonation and Homoaldol Reaction of 1,3-Dien-2-yl Carbamates: Stereo- and Regiochemistry
摘要:
[GRAPHICS]Lithium compounds 7 are configurationally stable intermediates obtained by deprotonation of 1,3-dien-2-yl carbamates 6 with n-butyllithium/(-)-sparteine with a high degree of enantiotopic differentiation at the gamma-position. They react with electrophiles regioselectively giving highly enantioenriched products. Starting with different isomers or changing the double-bond geometries in 6 leads to either of the enantiomers.
Asymmetric γ-Deprotonation and Homoaldol Reaction of 1,3-Dien-2-yl Carbamates: Stereo- and Regiochemistry
作者:Roland Bou Chedid、Roland Fröhlich、Dieter Hoppe
DOI:10.1021/ol061005p
日期:2006.7.1
[GRAPHICS]Lithium compounds 7 are configurationally stable intermediates obtained by deprotonation of 1,3-dien-2-yl carbamates 6 with n-butyllithium/(-)-sparteine with a high degree of enantiotopic differentiation at the gamma-position. They react with electrophiles regioselectively giving highly enantioenriched products. Starting with different isomers or changing the double-bond geometries in 6 leads to either of the enantiomers.