✦ LIBER ✦

The remarkable reactivity of 2-alkylidene-imidazolidines in inverse diels-alder reactions

✍ Scribed by Ursula Gruseck; Manfred Heuschmann

Publisher: Elsevier Science
Year: 1987
Tongue: French
Weight: 229 KB
Volume: 28
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)96855-2

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✦ Synopsis

The reactivity of 2-alkylidene-imidazolidines 2 in inverse Diels-Alder syntheses with several pyridazines and 1,2,4-triazines is compared with that of acyclic ketene acetals 1. The 2-cyclopropylidene-imidazolidine 2~ is particularly suited for less reactive dienes.

Extensive work of Sauer 1) and others2) has shown that ketene N,N-acetals Ia,

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