Hans Plieninger

Synthese O- und C-alkylierter Indoxylderivate

Der Indoxyl-2-carbonsaure-ester (4) wird mit Allylchlorid und Dimethylallylbromid in der 2-Stellung zu6 bzw.7 alkyliert. In geringer Ausbeute dargestelltes 4-Diazo-2-methyl-buten-(2) (11) alkyliert4 ebenfalls in2-Stellung, jedoch unter Inversion der Substituenten zu2.

Ein neuer zugang zu 3,4-dihydropyrromethenonen als bausteine für phytochromobilin-modellverbindungen

Abstract TiCl4 mediated isomerization of 5(4H)-dipyrrylmethanones with simultaneous formylation or catalytic hydrogenation of 5′-formyl-5(1H)-pyrromethenones leads to 5′-formyl-3,4-dihydro-5(1H)-pyrromethenones.

Synthesis of ethyl 3-bromo-2-ethoxy-2-(4-hydroxybenzoyloxy)propionate and attempts at cyclisation (a correction)

The title compound (1) has been synthesised by a new, easily reproducible route. Attempts to cyclise (1) to the dienone (2) were not successful. Some products of these experiments were identified.