Sashida H, Minamida H. Thermal Ring Expansion of 2-Azidoselenochromenes: First Synthetic Examples of 1,3-Benzoselenazepines.
Chem Pharm Bull (Tokyo) 2004;
52:485-7. [PMID:
15056973 DOI:
10.1248/cpb.52.485]
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Abstract
The thermolysis of 2-azido-2-tert-butyl-2H-selenochromenes (2a, b), which were easily obtained by the reaction of the corresponding 1-benzoselenopyrylium salts (1) with sodium azide, resulted in a ring expansion to give the novel stable 1,3-benzoselenazepines (5a, b) with denitrogenation in good yields.
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