Some trifluoromethyl group substituted ethynylfurans were prepared according to the method of Okuhara. However, dichlorofluorovinylation of lithiated 2,3-bis(trifluoromethyl)- furan did not undergo so smoothly because of the electron- withdrawing trifluoromethyl groups and the initially substituted dichlorofluorovinyl group. Thermal, γ-ray induced, or oxidation polymerizations were investigated, and
Novel Diels-Alder cycloaddition involving two α,β-unsaturated esters in the formation of isocoumarins from the reaction of ethly propynoate with 3,4-bis(trifluoromethy)furan
作者:Aliyu Balarabe Abubakar、Brian Lewis Booth、Anthony Edgar Tipping
DOI:10.1016/s0022-1139(00)82385-4
日期:1990.5
4-carboxylate (8) in the ratio 52:9, produced by Diels-Alder cycloaddition of the alkyne to the α,β-unsaturated ester function of the initially-formed 1:1 adduct, the oxanorbornadiene (9), followed by opening of the oxygen bridge and elimination of ethanol. The corresponding reaction involving dimethylacetylenedicarboxylate gives the expected oxanorbornadiene (5).
Reaction of 2-lithio-3.4-bis(trifluoromethyl)furan with electrophiles
作者:Aliyu B. Abubakar、Brian L. Booth、Anthony E. Tipping
DOI:10.1016/s0022-1139(00)80121-9
日期:1991.12
2-Substituted-3,4-bis(trifluoromethyl)furans activated CH = C(CF3)C(CF3) = CR-O [R = CO2H (and hence R = CO2Me and CO2Et), CHO, CHPhOH, CHMeOH, CH(OH)CH = CH2] are obtained in good yield by treatment of the corresponding 2-lithiofuran with the appropriate electrophile. With methyl acrylate, initial attack occurs at carbonyl carbon but the resulting ketone (R = COCH = CH2) undergoes Michael addition with an excess of the lithium salt. From the reaction with dichloromaleic anhydride, 5,5-bis[3,4-bis(trifluoromethyl)-2-furyl]-3,4-dichloro-2-furanone is formed in 85% yield.
ABUBAKAR, ALIYU BALARABE;BOOTH, BRIAN LEWIS;TIPPING, ANTHONY EDGAR, J. FLUOR. CHEM., 47,(1990) N, C. 353-359
作者:ABUBAKAR, ALIYU BALARABE、BOOTH, BRIAN LEWIS、TIPPING, ANTHONY EDGAR
DOI:——
日期:——
WARRENER, R. N.;WANG, J. -M.;WEERASURIA, K. D. V.;RUSSELL, R. A., TETRAHEDRON LETT., 31,(1990) N8, C. 7069-7072
作者:WARRENER, R. N.、WANG, J. -M.、WEERASURIA, K. D. V.、RUSSELL, R. A.