Site selectivity in the reactions of 1,3-dipoles with norbornadiene derivatives
作者:D. Cristina、M. De Amici、C. De Micheli、R. Gandolfi
DOI:10.1016/s0040-4020(01)92451-2
日期:1981.1
2-diazopropane and C-pnenyl-N-methyl-nitrone react with the sole tetrasubstituted double bond of 1a–c in stereo- and site-specific cycloadditions. The quantitative evaluation of the two possible reaction paths was performed by glc analysis. The compounds detected were those arising from Diels-Alder cycloreversions of the thermally labile intermediate adducts 2 and 3 (Scheme 1). The results were rationalized
Thermolysis of 1,3,2,4-dioxathiazole 2-oxides. Nitrile oxide intermediates
作者:John E. Franz、Helen K. Pearl
DOI:10.1021/jo00869a061
日期:1976.4
ABU-ORABI SULTAN T., J. CHEM. AND ENG. DATA, 31,(1986) N 4, 505-506
作者:ABU-ORABI SULTAN T.
DOI:——
日期:——
4-Alkoxycarbonyl- and Aminocarbonyl-Substituted Isoxazoles as Masked Acrylates and Acrylamides in the Asymmetric Synthesis of Δ<sup>2</sup>-Isoxazolines
作者:Connie K. Y. Lee、Anthony J. Herlt、Gregory W. Simpson、Anthony C. Willis、Christopher J. Easton
DOI:10.1021/jo0602569
日期:2006.4.1
treatment with sodium borohydride and sodium trifluoroacetoxyborohydride, respectively. They are also alkylated at C5 through sonication with secondary and tertiary alkyl iodides in the presence of zinc dust and copper(I) iodide. These reactions are analogous to those observed with acrylates and acrylamides. The behavior is characteristic of the 4-substituted isoxazoles but not the 5-substituted regioisomers