65782-17-4Relevant articles and documents
Oxonium Ions in Organic Synthesis: Condensation of 2,3-Dihydrofuran and 3,4-Dihydro-2H-pyran with 1,3-Dicarbonyl Compounds
Bihovsky, Ron,Kumar, Mudubagilu Udaya,Ding, Shuji,Goyal, Arun
, p. 4291 - 4293 (1989)
2,3-Dihydrofuran (3a) and 3,4-dihydro-2H-pyran (3b) condense with a variety of β-keto esters and cyclic or acyclic β-diketones (or their enol tautomers) in the presence of trifluoroacetic acid, to form 2-(tetrahydrofuran-2-yl)-1,3-dicarbonyl (6) and 2-(te