1,3-Diketones were synthesized from alpha,beta-unsaturated ketones by treatment with acid chlorides and Et(2)Zn in the presence of RhCl(PPh(3))3. This is a very simple and extremely chemoselective reaction to give the adduct at the alpha-position of alpha,beta-unsaturated ketones.
Base-Induced Transformation of 2-Acyl-3-alkyl-2<i>H</i>-azirines to Oxazoles: Involvement of Deprotonation-Initiated Pathways
作者:Yingtang Ning、Yuko Otani、Tomohiko Ohwada
DOI:10.1021/acs.joc.7b00904
日期:2017.6.16
intermediate possessing methyl substituents at C(3) appears to be more stable than the tautomeric nitrile ylide which was proposed to be involved in photoinduced and pyrolysis reactions of 2-acyl-3-alkyl-2H-azirines to afford oxazoles. Thus, intermediacy of ketenimine is consistent with both experimental and computational results, at least under strongly basic reaction conditions.