Year 2007, Month 8 (Section Brief Communications, Page 1675)
Heterocycles with the bridgehead N atom
17.* Recyclization of 2,3,5,7-tetramethyloxazolo[3,2-a]pyrimidinium perchlorate
in reactions with the simplest nucleophiles
E. V. Babaev and V. L. Alifanov
2,3,5,7-Tetramethyloxazolo[3,2-a]pyrimidinium perchlorate in reactions with sodium hydroxide, sodium ethoxide, and pyrrolidine undergoes earlier unknown recyclization into 1-substituted pyrrolo[1,2-c]pyrimidines. Recyclization of the same salt under the action of ammonia gives 2,3,5,7-tetramethylimidazo[1,2-a]pyrimidine.
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