Thermal transformations of alk-1-enyl-N-phthalimidoaziridines
作者:M. A. Kuznetsov、V. V. Voronin
DOI:10.1134/s1070428013010156
日期:2013.1
Thermolysis of alk-1-enyl-N-phthalimidoaziridines leads to products of 1,5-electrocyclization of intermediate azomethine ylides with participation of C=C bonds. If acyl or alkoxycarbonyl substituent is present in the aziridine ring, the C=O bond is also involved. Thermolysis of the title compounds in the presence of N-phenylmaleimide or dimethyl acetylenedicarboxylate under analogous conditions gives products of 1,3-dipolar cycloaddition of azomethine ylides to the double or triple bond of the dipolarophile. DOI: 10.1134/S1070428013010156
Rhodium-catalyzed heterocycloaddition route to 1,3-oxazoles as building blocks in natural products synthesis
作者:Richard D. Connell、Mark Tebbe、Anthony R. Gangloff、Paul Helquist、Björn Åkermark
DOI:10.1016/s0040-4020(01)87261-6
日期:——
Rhodium(II) acetate serves as a catalyst for the heterocycloaddition reaction of diazodicarbonyl compounds with nitriles to give functionalized 1,3-oxazole derivatives in a simple one-step procedure. In particular, dimethyl diazomalonate undergoes this reaction to give 2-aryl-, 2-alkenyl-, or 2-alkyl-4-carbomethoxy-5-methoxy-1,3-oxazoles, and ethyl formyldiazoacetate (diazomalonate half-ester half-aldehyde)