J. Cyrener et K. Burger, UNEXPECTED REACTIONS OF 4,4-BIS(TRIFLUORO METHYL)-1-OXA-3-AZABUTA-1,3-DIENES - TANDEM REACTION WITH ACRYLONITRILE, Monatshefte fuer Chemie, 126(12), 1995, pp. 1383-1390
,4-Bis(trifluoromethyl)-1-oxa-3-azabuta-1,2-dienes and acrylonitrile r
eact in the presence of equimolar amounts of 4-dimethylaminopyridine (
DMAP) to give 2:1-adducts. A sequential [4 + 2] cycloaddition is propo
sed.