✦ LIBER ✦

Reactions of 3-acetyltropolone with benzaldehydes in trimethyl orthoformate in the presence of perchloric acid: Synthesis of 2-aryl-4-methoxy-9-oxocyclohepta[b]pyrylium perchlorates

✍ Scribed by Dao-Lin Wang; Kimiaki Imafuku

Publisher: Journal of Heterocyclic Chemistry
Year: 1998
Tongue: English
Weight: 192 KB
Volume: 35
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570350632

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✦ Synopsis

Abstract

3‐Acetyltropolone (1) reacted with benzaldehydes in trimethyl orthoformate in the presence of perchloric acid to afford 2‐aryl‐4‐methoxy‐9‐oxocyclohepta[b]pyrylium perchlorates 3a‐c in 25–37% yields. From the filtrates, 3‐(3,4‐diaryl‐3‐butenoyl)tropolones 4a,b and 3‐(2‐methoxycinnamoyl)tropolone (5) were also isolated.

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