Abstract
From multi-substituted 8-aminoimidazo[1,2-a]pyrazines, prepared via modified Groebke–Blackburn–Bienaymé reaction, a Pd-catalyzed cyclization reaction was discovered, leading to a rare (Z)-4,5-dihydro-3H-[1,3]diazocine system. Conditions of this cyclization were screened and DMF solvent was found as one of the key factors for the cyclization.
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