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A new route to cyclic urea derivatives of sugars via phosphinimines

✍ Scribed by József Kovács; István Pintér; András Messmer; Gábor Tóth; Helmut Duddeck

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
714 KB
Volume
166
Category
Article
ISSN
0008-6215

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A cyclopropenone route to new pyrrolizid
A cyclopropenone route to new pyrrolizidine derivatives
✍ Albert Kascheres; Heloisa C. Schumacher; Reinaldo A. F. Rodrigues 📂 Article 📅 1997 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 177 KB

## Abstract New pyrrolizidine derivatives 6 and 7 were prepared from the 1, 5‐dihydro‐2__H__‐pyrrol‐2‐one 3a __via__ an acidic intramolecular aldol condensation in 16% and 42% yields, respectively. Compound 6 was obtained by dehydration of 7 with __p__‐toluenessulfonic acid in 67% yield.