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Short Paper | Regular issue | Vol 92, No. 11, 2016, pp.2047-2058
Published online, 14th October, 2016
DOI: 10.3987/COM-16-13551
Facile Synthesis of Imidazo[1,5-a]pyrazin-8(7H)-ones from Mesoionic 1,3-Oxazolium-5-olates via a Multistep One-Pot Transformation

Ryosuke Saijo, Hidemitsu Uno, and Masami Kawase*

*Faculty of Pharmaceutical Sciences, Matsuyama University, 4-2 Bunkyo-cho, Matsuyama, Ehime 790-8578, Japan


A novel one-pot conversion of mesoionic 4-trifluoroacetyl-1,3-oxazolium-5-olates into imidazo[1,5-a]pyrazin-8(7H)-ones by the reaction with TosMIC is described. The structure of the product was determined by single-crystal X-ray analysis.