✦ LIBER ✦

4,4-Dimethoxy-3,5-bis(methylthio)-4H-pyrazol als Diazadien in [4+2]-Cycloadditionen. 4,4-Dimethoxy-3,5-bis(methylthio)-4H-pyrazole as Diazadiene in [4+2] Cycloadditions

✍ Scribed by Andreas Kümmell; Christiane Meyer-Dulheuer; Gunther Seitz

Publisher: John Wiley and Sons
Year: 1994
Tongue: English
Weight: 200 KB
Volume: 327
Category: Article
ISSN: 0365-6233
DOI: 10.1002/ardp.19943270909

No coin nor oath required. For personal study only.

✦ Synopsis

Wie wir kiirzlich zeigen konnten, reagiert das aus der Carbenquelle 1 generierbare Dimethoxycarben 2 rnit dem Diazadiensystem des Tetrazins 4 in einer Folge von [4+1]-Cycloaddition und anschlieaender N2-Eliminierung in guten Ausb. zum Isopyrazol-4-on-ketal 7l). Vorfeilhafter l a t sich das nucleophile Carben 2 aus dem leichter zuganglichen 2,2-Dimethoxy-A3-1,3,4-oxadiazolin 32) freisetzen und mit 4 abfangen. Dabei entsteht das Isopyrazol 7 in praparativ Literatur

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