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Cyclization of bis-urethanes as a new method for the synthesis of 5-substituted, 6-membered cyclic ureas

✍ Scribed by Kathy J. Fordon; Christopher G. Crane; Cynthia J. Burrows

Book ID
104214612
Publisher
Elsevier Science
Year
1994
Tongue
French
Weight
143 KB
Volume
35
Category
Article
ISSN
0040-4039

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✦ Synopsis

A coavcniul synlhwis of 5-subslitutcd 6-manbad cyclic ureas is &suiW.

Tk key step involves inbnmoledtx cyclization of 1.3diii~ &rivativca with ur&anc pmecling gnx~ps on Ihe nitrogen atans.

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A New Method for the Synthesis of Nonsym
A New Method for the Synthesis of Nonsymmetrically Substituted Bis(azulen-1-yl) Ketones
✍ Rolf Sigrist; Hans-Jürgen Hansen 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 German ⚖ 288 KB

## Abstract The 1‐(3‐methylazulen‐1‐yl)alkan‐1‐ones, when oxidized with excess 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (=4,5‐dichloro‐3,6‐dioxocyclohexa‐1,4‐diene‐1,2‐dicarbonitrile; DDQ) in aqueous acetone in the presence of 1‐(3‐demethylazulen‐1‐yl)alkan‐1‐ones, form the corresponding unsymmetr