A Highly Convenient, One-Pot Synthesis of 3-Bromo-1,5- and -1,7-Azulenequinones by Polybromination of Azulene.

A very convenient, one-pot synthesis (in ca. 80% yield) of 3-Bromo-1,5- and -1,7-azulenequinones which can be used as synthones has been developed by polybromination of azulenes. Zink dust reduction and reductive acetylation of these azulenequinones were studied, and possible pathways for the present synthesis are briefly discussed.