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New efficient synthesis of 1,2,4-trisubstituted imidazoles and imidazo[1,2-c]quinazolines by a tandem aza-Wittig/electrocyclic ring-closure process

✍ Scribed by Yi-Bo Nie; Zhuan Duan; Ming-Wu Ding


Book ID
113929187
Publisher
Elsevier Science
Year
2012
Tongue
French
Weight
299 KB
Volume
68
Category
Article
ISSN
0040-4020

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One pot preparation of pyrido[2,3,4-de]q
✍ Pedro Molina; Mateo AlajarΓ­n; Angel Vidal πŸ“‚ Article πŸ“… 1991 πŸ› Elsevier Science 🌐 French βš– 266 KB

Aza Wittlg-type reactIonof~bu(rm~nophosphoranel I wrth one mole of-zsocyanate leads to the zmmophosphoranes 5 whrcti by treatment with a secondmok of-uocyanate affordedpyndo[2,3,Cde/qutnazo~nes 6 Smularly, reaction with ketenes leads to the formanon of benzo[del[l,6]naphthyrrdmes9 Direct converszon