Regio- and stereoselective 1,3-dipolar cycloaddition of arylnitrile oxides to 5-acetoxy-2(5H)-furanone
摘要:
Arylnitrile oxides undergo regio- and stereo-specific 1,3-dipolar cycloaddition reactions with 5-acetoxy-2(5H)-furanone. In each case a single product 3a-3g results from an anti approach to the 5-acetoxy substituent, the oxygen of the 1,3-dipole being attached to C-4 of furan. Under similar conditions 5-benzoyloxy-2(5H)-furanone yields 3h-3i. The structures of the adducts were determined by H-1 and C-13-NMR spectroscopy.
Lipase catalyzed enantioselective transesterification of 5-acyloxy-2(5H)-furanones
作者:Hanneke van der Deen、Robert P. Hof、Arjan van Oeveren、Ben L. Feringa、Richard M. Kellogg
DOI:10.1016/s0040-4039(00)74428-5
日期:1994.11
Several lipases catalyse the transesterification of γ-acyloxyfuranones in organic solvents with high enantioselectivities. This method has been used for the kineticresolution of 5-acetoxy-2(5H)-furanone, 5-acetoxy-4-methyl-2(5H)-furanone and 5-propionyloxy-2(5H)-furanone, in e.e.'s ranging from 68–98%.
Electron-Poor Butenolides: The Missing Link between Acrylates and Maleic Anhydride in Radical Polymerization
作者:Mathieu L. Lepage、Georgios Alachouzos、Johannes G. H. Hermens、Niels Elders、Keimpe J. van den Berg、Ben L. Feringa
DOI:10.1021/jacs.3c04314
日期:2023.8.9
that of maleicanhydride, another essential monomer that does not homopolymerize but copolymerizes in a highly alternating fashion with polarized electron-rich comonomers. By studying the reactivity of 5-methoxy and 5-acyloxy butenolides through a combination of kinetics and density functional theory (DFT) experiments, we explain why electron-poor butenolides constitute a missing link between acrylates
作者:Shaw-Tao Lin、Yuch-Hsiung Kuo、Eng-Chi Wang、Wen-Chung Lin
DOI:10.1002/jccs.199700021
日期:1997.4
AbstractThe mass spectra of a series of substituted butenolides were studied. Their fragmentations in the mass spectrometer strongly depend upon the nature of the substitutents. The fragment's ions include the lactone skeletons, substituents, and resultant derived from the loss of a carbon dioxide from lactone.
ORAVEC, PETER;FIERA, LUBOR;GAZO, ROMAN, MONATSH. CHEM., 122,(1991) N, C. 165-170
作者:ORAVEC, PETER、FIERA, LUBOR、GAZO, ROMAN
DOI:——
日期:——
Palladium Catalyzed Kinetic and Dynamic Kinetic Asymmetric Transformations of γ-Acyloxybutenolides. Enantioselective Total Synthesis of (+)-Aflatoxin B<sub>1</sub> and B<sub>2</sub><sub>a</sub>
作者:Barry M. Trost、F. Dean Toste
DOI:10.1021/ja020988s
日期:2003.3.1
either a kinetic resolution or a kineticasymmetrictransformation (KAT) or dynamickineticasymmetrictransformation (DYKAT). Performing the reaction at high concentration (0.5 M) in the presence of a carbonate base favors the former, i.e., KAT; whereas, running the reaction at 0.1M in the presence of tetra-n-butylammonium chloride favors the DYKAT process. Syntheses of aflatoxin B(1) and B(2a) employs