- An improved synthesis of dibenzofurans by a free-radical cyclization
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Reaction conditions for the formation of dibenzofurans from diazotized o-(aryloxy)anilines have been examined. Several promoters (hydroquinone, SnCl2, NaI, CuSO4, FeSO4, etc.) have been discovered; these act as electron donors and promote a free-radical mechanism. The best of these is FeSO4 which shortens the reaction time from hours to minutes and contributes to high yields (77-83%). We have been able to transform the cyclization to a reliable and convenient synthesis.
- Wassmundt,Pedemonte
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p. 4991 - 4994
(2007/10/03)
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- 1-,2-,3-,4-,5-,6-,7-,8- AND/OR 9 SUBSTITUTED DIBENZOXAZEPINE COMPOUDS, PHARMACEUTICAL COMPOSITIONS AND METHODS FOR TREATING PAIN
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The present invention provides substituted dibenzoxazepine compounds of Formula I: STR1 which are useful as analgesic agents for the treatment of pain, pharmaceutical compositions comprising a therapeutically-effective amount of a compound of Formula I in combination with a pharmaceutically-acceptable carrier, and a method for eliminating or ameliorating pain in an animal comprising administering a therapeutically-effective amount of a compound of Formula I to the animal.
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