Rw. Hoffmann et al., Efficient homologation of aldehydes to 2,4,6-alkatrienals by means of an alpha-(1,3-dioxenylallyl)boronate, SYNTHESIS-S, (14), 2000, pp. 2060-2068
The alpha -dioxenyl-allylboronate 4 allows the direct conversion of aldehyd
es into the 7-hydroxy-2,4-dienals (6). The latter compounds can be dehydrat
ed to 2,4,6-alkatrienals 7 by means of the Burgess reagent or methanesulfon
yl anhydride/Hunig Base.