Collect. Czech. Chem. Commun. 1985, 50, 675-682

Reaction of vinamidinium salts of furan with aldehydes

Tibor Graczaa, Zdeněk Arnoldb and Jaroslav Kováča

a Department of Organic Chemistry, Slovak Institute of Technology, 812 37 Bratislava
b Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6


5-(N,N-dimethylamino)-2-furfurylidene-N,N-dimethylimmonium bromide(I) reacts with aromatic aldehydes and its vinylogues to give condensation products II. Addition of alkoxides, sulfinates or thiolates to II renews the furan ring what can be utilized for preparation of new 4-(Ar-, R-methyl)-5-(N,N-dimethylamino)-2-furancarbaldehydes IV.