Synthesis of Oxazolidin-2-ones by Tandem Cyclization of Propargylic Alcohols and Phenyl Isocyanate Promoted by Silver Catalysts as π-Lewis Acids
作者:Tohru Yamada、Kohei Sekine、Takanori Mawatari
DOI:10.1055/s-0035-1560263
日期:——
Highly Z-selective syntheses of oxazolidin-2-ones from propargylic alcohols containing internal alkynes and phenyl isocyanate were achieved by using a combination of silver acetate and N,N-dimethylaminopyridine. The catalytic system was applied to propargylic alcohols containing alkyl-substituted alkyne groups. By considering the results in the presence and absence of an electron-withdrawing group on the aromatics, it was shown that the silver catalyst effectively activates the CC triple bond by acting as a -Lewis acid to produce the corresponding oxazolidinones with high Z-selectivities.
Substituted 4-(1′,2′-alkadienesulphinyl)-morpholines; preparation and hydrolytic desulphinylation into the corresponding alkynes
作者:Jean-Bernard Baudin、Sylvestre A. Julia、Yuan Wang
DOI:10.1016/s0040-4039(01)80555-4
日期:1989.1
Baudin Jean-Bernard; Julia, Sylvestre A; Wang, Yuan, Bulletin de la Societe Chimique de France, 1995, vol. 132, # 7, p. 739 - 753