Preparation of 3-(3,4,5,6,-tetrahydrophthalimido)-benzaldehydes

Details Preparation of 3-(3,4,5,6,-tetrahydrophthalimido)-benzaldehydes Preparation of 3-(3,4,5,6,-tetrahydrophthalimido)-benzaldehydes

C - Chemistry, Metallurgy

07

D

260/353.3, 260/3

C07D 209/48 (2006.01) C07D 317/16 (2006.01) C07D 317/28 (2006.01) C07D 319/06 (2006.01)

Patent

CA 1340663

Abstract of the Disclosure: 3-(3,4,5,6-Tetrahydrophthal- imido)-benzaldehydes of the type I (see fig. I) or corresponding derivatives substituted in the phenyl ring are prepared by a) acetalization of a 3-nitrobenzaldehyde III or of a corresponding derivative with an alcohol IV in the presence of an acidic catalyst to give the corresponding cyclic acetal V (see fig II) b) reduction of the cyclic acetal V with hydrogen to give the corresponding amino compound II and c) subsequent condensation of this aminophenyl acetal II with 3,4,5,6-tetrahydrophthalic anhydride in an acidic reaction medium.

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