Use of the Graebe-Ullmann reaction in the synthesis of 8-methyl-γ-carboline and isomeric aromatic aza-γ-carbolines
摘要:
Two variants of the Graebe-Ullmann reaction were used to obtain 8-methyl-5H-pyrido[4,3-b]indole (8-methyl-gamma-carboline) and the conditions for this reaction were optimized. The feasibility of using this method was studied for the synthesis of a series of isomeric aromatic aza-gamma-carbolines from the corresponding 1-(pyridyl)-1H-1,2,3-triazolo[4,5-c]pyridines under thermal and microwave irradiation conditions.
3H-1,2,3-Triazolo[4,5-b]pyridines substituted in the 3-position have utility as analgesic, anti-inflammatory and anti-pyretic agents. They are prepared by diazotization of a 3-amino-2-(substitute) aminopyridine.
Novel 1,3-dihydro-imidazo-(4,5-b)-pyridin-2-ones of the formula ##STR1## wherein R is alkyl of 1 to 3 carbon atoms and R' is pyridyl and Y is selected from the group consisting of hydrogen and chlorine and their non-toxic, pharmaceutically acceptable acid addition salts having gastric anti-secretic and anti-ulcerogenic and anorexigenic activity and a novel process and novel intermediates for their preparation.