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4-Acyl-2,3,4,5-tetrahydro-2-methyl-2,5-methano-benz-1,4-oxazepine, Derivate eines neuen Heterocyclus

✍ Scribed by Dr. Hans-Joachim Kabbe; Dr. Helmut Heitzer; Dr. Liborius Born

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
321 KB
Volume
103
Category
Article
ISSN
0044-8249

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✦ Synopsis

Die Photocycloaddition-Iminium-Ion-Allylsilan-Sequenz verlluft hoch diastereoselektiv. So wurden von den acht moglichen Diastereorrieren jeweils nur die Konfigurationsisomere 17 oder 18 gefunden. Wir vermuten. daD der intramolekulare Angriff der Allylsilan-Gruppe an C-2 im Iminium-Ion 23 mti-stsndig zurn Wasserstoff an C-3 erfolgt. Dies stimmt mit einer stereoelektronischen Kontrolle['ol der Addition uberein. Die 1run::-Anordnung der Substituenten in 23 wird entweder direkt bei der photochemischen Cycloaddition undioder uber cine Iminium-Enamin-Isomerisierung gebildet.

πŸ“œ SIMILAR VOLUMES

4-Acyl-2,3,4,5-tetrahydro-2-methyl-2,5-m
4-Acyl-2,3,4,5-tetrahydro-2-methyl-2,5-methanobenz-1,4-oxazepine, Derivatives of a New Heterocycle
✍ Dr. Hans-Joachim Kabbe; Dr. Helmut Heitzer; Dr. Liborius Born πŸ“‚ Article πŸ“… 1991 πŸ› John Wiley and Sons 🌐 English βš– 336 KB

highly-aggregated dilithiated organics akin to 1 include the nitrile dodecamer 2[6a1 and the sulfone hexamer 3.[6bl It is also noteworthy that the core of 1 can be considered as belonging to the fluorite (CaF,) structural type (N corresponding to Ca, Li to F ) and that even the "external" Et,O-compl