Studies on Pyrimidine-Annulated Heterocycles: A Short Synthesis of Novel 6,9-Disubstituted Cyclohepta[b]pyrimido[5,4-d]pyrrole-8(6H),10(9H)-diones

Makoto Nitta, Yohei Tajima

Synthesis · 2000 · 23 citations · 0 references

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Abstract

A number of 6,9-disubstituted cyclohepta[b]pyrimido[5,4-d]pyrrole-8(6H),10(9H)-dione derivatives have been synthesized in good to moderate yields by the reaction of 6-amino-3-methyluracil derivatives with 2-chlorotropone in an enamine-alkylation process, subsequent condensation of the amino group with the carbonyl function, dehydrochlorination, and dehydration.