Synthesis of 2,6-Diaminoazulenes by the SNAr Reaction with Cyclic Amines
摘要:
2-Amino-6-bromoazulene derivatives reacted with cyclic amines (pyrrolidine, piperidine and morpholine) under the sealed-tube conditions to afford the corresponding 2,6-diaminoazulenes in excellent yields.
Synthesis of 2,2′-diamino-1,1′-biazulene derivatives 5 and 9–11 was established by copper-catalyzed homocoupling reaction of the corresponding 2-aminoazulenes 3 and 6–8. The palladium-catalyzed cross-coupling reactions of 6,6′-dibromo-1,1′-biazulene derivative 9 were also established under the Suzuki–Miyaura and Sonogashira–Hagihara conditions.
2-Amino-6-bromoazulene derivatives reacted with cyclic amines (pyrrolidine, piperidine and morpholine) under the sealed-tube conditions to afford the corresponding 2,6-diaminoazulenes in excellent yields.