β-halo α,β-unsaturated aldehydes by a microwave-assisted Knoevenagel reaction. The β-halo-α,β-unsaturated aldehydes were, in turn, efficiently synthesized from the corresponding ketones by a Vilsmeier formylation reaction. The protocol was used to synthesize several novel steroidal and nonsteroidal fused 2-aminopyridine derivatives. 2-Aminopyridines were synthesized from β-halo α,β-unsaturated aldehydes
Synthese von substituierten 2-Aminonicotinonitrilen
作者:Reinhard Troschütz、Thomas Dennstedt
DOI:10.1002/ardp.19943270107
日期:——
Mono‐, di‐ und trisubstituierte 2‐Aminonicotinonitrile vom Typ 8, 13, 14 und 19 lassen sich aus Keton‐Mannich‐Basen Hydrochloriden 4 · HCl, Enonen 12, β‐Aminovinylketonen 17, 3‐Aminoacrolein‐Derivaten 18 sowie Vinamidinium Perchloraten 21 und in situ erzeugtem 3,3‐Diamino‐acrylnitril (3) herstellen.