Recent advances in the synthesis of pyridopyrimidine analogues were reviewed in this article in- cluding pyrido[2,3-d]pyrimidine, pyrido[1,2-a]pyrimidine and pyrido[4,3-d]pyrimidine analogues with 71 references.

Recent advances in the synthesis of thiazolopyrimidine analogues including thia- zolo[3,2-a]pyrimidine, thiazolo[4,5-d]pyrimidine, thiazolo[5,4-d]pyrimidine analogues, which are widely used in the fields of medicine and pesticide, are reviewed in this article.

Synthesis and antitumor activities of 5,7-disubstituted pyrazolo[1,5-a]pyrimidines;