Journal
ORGANIC LETTERS
Volume 15, Issue 3, Pages 642-645Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol303463e
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A facile one-pot synthesis of 3,4-dihydro-1H-pyrido[1,2-a]pyrazine-1,6(2H)-diones (pyridopyrazine-1,6-diones) has been developed which employs a sequential coupling/cyclization reaction of 6-hydroxypicolinic acids and beta-hydroxylamines. The transformation proceeds In good yield under mild conditions using O-(7-aza-1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) to both carry out the amide formation and activate the hydroxyl group for intramolecular alkylation.
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