1-(Bromoacetyl)-3-methylazulene (1a) and methyl 3-(bromoacetyl)azulene-1-carboxylate (1b) reacted with thioamides 3a,b and thioureas 3c,d in boiling ethanol to give the corresponding (4-thiazolyl)azulenes 4a-d and 5a-d in good yields, respectively. The reactions of dibromoacetyl-substituted azulene (2) also gave (4-thiazolyl) azulenes 5a-d in lower yields and the azulene 2 was recovered. By heating