Opening of the furanring and concomitant closure of a cyclopropane ring was observed in the reaction of 2-methoxy- and 2-p-tolyloxyfuran with 2,3-bis(trifluoromethyl)fumaronitrile (trans-BTE). Electrophilic 5-attack gives rise to a zwitterion which can rotate about the acceptor bond, dissociate to reactants, or furnish diastereoisomeric cis-3-cyclopropylacrylates. In the presence of pyridine, 1,3-prototropy
Synthesis and tuberculostatic activity of adducts of aryl- and aryloxyfurans with acetylenedicarboxylic ester, maleic anhydride, and N-phenylmaleimide
作者:A. F. Oleinik、E. V. Adamskaya、K. Yu. Novitskii、N. P. Solov'eva、N. I. Fadeeva、I. N. Degtyareva、N. B. Lapaeva、G. N. Pershin
DOI:10.1007/bf00777382
日期:1980.3
Donor-substituted furans and 1,2-bis(trifluoromethyl)ethylene-1,2-dicarbonitrile: The hidden cycloadditions
作者:Rolf Huisgen、Grzegorz Mloston
DOI:10.1016/s0040-4039(00)73298-9
日期:1994.7
2-p-Tolyloxyfuran or 2-methoxyfuran and BTE, the title compound rapidly establish equilibria with [2+2] and/or [4+2] cycloadducts as monitored by F-19 NMR analysis; finally, the irreversible opening of the furan ring and concomitant closure of a cyclopropane ring wins. Dissociation constants of four trans-adducts and one cis-adduct were measured over a temperature range of 90 degrees C; the reaction enthalpies and entropies art discussed.
OLEJNIK A. F.; ADAMSKAYA E. V.; NOVITSKIJ K. YU.; SOLOVEVA N. P.; FADEEVA+, XIM.-FARMATS. ZH., 1980, 14, HO 3, 49-53
作者:OLEJNIK A. F.、 ADAMSKAYA E. V.、 NOVITSKIJ K. YU.、 SOLOVEVA N. P.、 FADEEVA+
DOI:——
日期:——
Huisgen Rolf, Mloston Grzegorz, Tetrahedron Lett, 35 (1994) N 28, S 4981-4984