Thermal ene reactions of methyl 3,3,3-trifluoro-2-methanesulfonyliminopropionate and methyl 2-benzenesulfonylimino-3,3,3-trifluoropropionate with terminal alkenes afford derivatives of gamma,delta -unsaturated alpha -amino alpha -trifluoromethylcarboxylic acids in one step.
2-Trifluoromethyl-substituted 1,2,3,6-tetrahydro-2-pyridyl carboxylates were synthesized in one step by the aza Diels-Alder reactions of methyl trifluoropyruvate sulfonyl- and phosphorylimines with 1,3-dienes.
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作者:A. E. Kul"yanova、S. N. Osipov、A. F. Kolomiets
DOI:10.1023/a:1014000100065
日期:——
Methyl trifluoropyruvate benzene- and methanesulfonylimines react with hex-1-yne and phenylacetylene to give methyl N-sulfonyl-4-oxo-2-trifluoromethyl-4-R-but-2E-enimidates. The reaction mechanism includes the formation of a six-centered bipolar ion followed by its cascade rearrangement.