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Interaction of the lithium derivative of 2,3‐dihydro‐4H‐pyrano[3,2‐b]pyridine with the diethyl acetal of bromoacetaldehyde, followed by hydrolysis and subsequent ring closure afforded the novel heterocycle 3,4‐dihydropyrano[2,3,4‐hi]indolizine which was inacessible by the Tschitschibabin method. However, the 2‐phenyl derivative was easily prepared by the Tschitschibabin method.

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No abstract

Bei der Behandlung mit Phenacylbromid (II) erhält man aus 2,3‐Dihydro‐ 4H‐pyrano[3,2‐lalpyridin (I) über diskutierte Zwischenstufen wie (III) das Pyranoindolizidin (IV).