Ynolates were found to react with alpha-alkoxy-, alpha-siloxy-, and alpha-aryloxyketones at room temperature to afford tetrasubstituted olefins with high Z selectivity. Since the geometrical selectivity was determined in the ring opening of the beta-lactone enolate intermediates, the torquoselectivity was controlled by the ethereal oxygen atoms. From experimental and theoretical studies, the high Z
While iminium salts generated by the oxidation of amino ketene silyl acetals show intriguing reactivities to give useful γ-oxo-α-amino esters via reactions with silyl enol ethers in good yields, new iminium salts are also prepared by the oxidation of amino silyl enol ethers. They undergo facile addition reaction with various nucleophiles to give α-amino ketone derivatives in good yields.
Mueller, Justus Liebigs Annalen der Chemie, 1955, vol. 598, p. 70,83
作者:Mueller
DOI:——
日期:——
WEICHET, J.;BLAHA, L.
作者:WEICHET, J.、BLAHA, L.
DOI:——
日期:——
Diastereoselectivity in the Reduction of α-Oxy- and α-Amino-Substituted Acyclic Ketones by Polymethylhydrosiloxane
作者:Durgesh Nadkarni、James Hallissey、Carlos Mojica
DOI:10.1021/jo0260544
日期:2003.1.1
Diastereoselectivity in the reduction of alpha-alkoxy-, alpha-acyloxy-, and alpha-alkylamino-substituted ketones with polymethylhydrosiloxane (PMHS) in the presence of fluoride ion catalysis was investigated. High syn-selectivity was observed in the reduction of alpha-alkoxy, alpha-acyloxy, and alpha-dialkylamino ketones. Reduction of alpha-monoalkylamino ketone proceeded in anti-selective manner with