✦ LIBER ✦

A simple synthesis of 2h-pyrans; A one-step synthesis of flindersine

✍ Scribed by Ae.de Groot; B.J.M. Jansen

Publisher: Elsevier Science
Year: 1975
Tongue: French
Weight: 188 KB
Volume: 16
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)91410-2

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✦ Synopsis

Valence isomerism menon. The influence between ZH-pyrans and cis-dienones is a well known phenoof substituents on the equilibrium position has been stu-1 7 r; diedlm4 and several synthetic approaches have been applied""'.

Especially in the field of the chromenes the synthetic efforts are concentrated on the preparation of the intermediate dienones which in these cases spontaneously and completely cyclize to the desired bicyclic ZH-benzopyrans 5 . When the ZH-py-

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