Aza-Wittig reaction of fluoroalkylated N-vinylic phosphazenes with carbonyl compounds. Usefulness of 2-azadienes for the preparation of fluoroalkyl pyridine derivatives
作者:Francisco Palacios、Concepción Alonso、Gloria Rubiales、Maite Villegas
DOI:10.1016/j.tet.2005.01.080
日期:2005.3
A method for the preparation of 3-fluoroalkyl substituted 2-aza-butadienes 6 by aza-Wittig reaction of 3-fluoroalkyl-N-vinylic phosphazenes 4 and aldehydes 5 is reported. [4+2] Cycloaddition reaction of these heterodienes 6 with enamines 9 gives fluoroalkyl substituted pyridine 15, 16, 24–27 and isoquinoline 12–14, 20 derivatives.
报道了通过3-氟烷基-N-乙烯基磷腈4和醛5的氮杂-Wittig反应制备3-氟烷基取代的2-氮杂-丁二烯6的方法。这些heterodienes [4 + 2]环加成反应6与烯胺9给出氟烷取代的吡啶15,16,24 - 27和异喹啉12 - 14,20个衍生物。