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Synthesis and Characterization of Some Aza[5]helicenes

✍ Scribed by Cristina Bazzini; Sergio Brovelli; Tullio Caronna; Cristian Gambarotti; Matteo Giannone; Piero Macchi; Francesco Meinardi; Andrea Mele; Walter Panzeri; Francesco Recupero; Angelo Sironi; Riccardo Tubino

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
177 KB
Volume
2005
Category
Article
ISSN
1434-193X

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Cover Picture: Synthesis and Characteriz
Cover Picture: Synthesis and Characterization of Some Aza[5]helicenes (Eur. J. Org. Chem. 7/2005)
✍ Cristina Bazzini; Sergio Brovelli; Tullio Caronna; Cristian Gambarotti; Matteo G 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 55 KB 👁 2 views

## Abstract **The cover picture shows** the structure of 5‐aza[5]helicene (top) and the crystal packing (single enatiomers, bottom). This is one of the aza[5]helicenes reported in the paper that were synthesized by photochemical ring closure of suitable ethenyl derivatives. The photophysical proper

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## Abstract Thiation of **1** by LR gave the corresponding 3,5‐dithioxo derivative **2** and the trimer **3**. Methylation of **1** afforded the S‐methyl derivative **4**. Compound **1** was fused with 6‐bromo‐2‐phenyl‐benzo[1,3‐d]oxazin‐4‐one **(****5****)** and gave **6**. Condensation of **1** w