Acetylenchemie 7. Mitt.: Mechanistische Studien zur Synthese von Pyrano-[3,2-c]chinolin-Alkaloiden aus 4-Hydroxychinolin-2-onen und 3-Chlor-3-methylbut-1-in
(1) Institut für Pharmazeutische Chemie, Universität Münster, D-4400 Münster, Bundesrepublik Deutschland
Abstract:
The pyrano-cyclisation of 4-hydroxy-(1-methyl)-1H-quinoline-2-one with 3-chlor-3-methylbut-1-yne, supposed to proceed via an ether or vinyl intermediate, is studied by alkylating different 4-hydroxyquinolines. The nine derivatives characterized favour the ether-pathway (Späth type chromene synthesis).