T. Okano et al., Reaction of 5-(trifluoromethyl)-2(5H)-furanone under basic conditions: Stereo-controlled Michael dimerization, TETRAHEDRON, 56(34), 2000, pp. 6219-6222
Treatment of 5-trifluoromethyl-2(5H)-furanone under basic conditions gave a
stereoisomeric mixture of two out of four possible stereoisomers of bis(tr
ifluoromethyl)dihydro-2,4-bisfuranonyl depending on the reaction conditions
. Butenolide anion generated with LDA is kinetically stable and reaction wi
th 2-cyclohexenone stereoselectively gave a Michael adduct. (C) 2000 Elsevi
er Science Ltd. All rights reserved.