Some reactions of 3,4-bis(trifluoromethyl)furan and its precursor, 2,3-bis(trifluoromethyl)-7-oxabicyclo[2,2,1]hepta-2,5-diene: novel isocoumarin formation from thermal reaction of the furan with ethyl propynoate
作者:Aliyu B. Abubakar、Brian L. Booth、Nadia N.E. Suliman、Anthony E. Tipping
DOI:10.1016/s0022-1139(00)81185-9
日期:1992.3
2,2,1]hepta-2,5-diene (2) gives 3,4-bis(trifluoromethyl)furan (1). Treatment of oxanorbornadiene (2) with triflic acid (in CH2Cl2 under reflux) and then with water affords a mixture of 2,3-bis(trifluoromethyl)phenol (4) (6%), tris-(6-trifluoromethylsalicylide) (5) (45%) and 2-trifluoromethyl-6-hydroxybenzoic acid (6) (16%); analogous reaction with conc. sulphuric acid gives only the phenol 4 (44%)
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).