KPEGBA, KAFUI;METZNER, PATRICK;RAKOTONIRINA, ROSE, TETRAHEDRON, 45,(1989) N, C. 2041-2056
作者:KPEGBA, KAFUI、METZNER, PATRICK、RAKOTONIRINA, ROSE
DOI:——
日期:——
Stéréospécificité de l'addition de Michael d'ènethiolates avec les énones acycliques
作者:Kafui Kpegba、Patrick Metzner、Rosé Rakotonirina
DOI:10.1016/s0040-4020(01)80066-1
日期:1989.1
E-enones (3-penten-2-one, chalcone) occurs with high stereospecificity: anti/syn product ratios are identical to the cis/trans enethiolate ratios. A pseudo-cyclic transition state is proposed with substituents of the enone C-C doublebond occupying favorable equatorial positions. The 1,4-addition reaction is kineticaly controlled. In contrast to ester enolates, enethiolates allow the use of enones without