Synthesis of new thieno[2,3-d]pyrimidines, thieno[3,2-e]pyridines, and thieno[2,3-d][1,3]oxazines
作者:Shrikant B. Kanawade、Shivaraj P. Patil、Prashant S. Nikam、Sachin A. Gangurde、Madhukar N. Jachak、Raghunath B. Toche
DOI:10.1002/jhet.748
日期:2012.3
o‐Aminothiophene dicarbonitrile 1 on neat reaction with cyclic ketones in anhydrous ZnCl2 yielded mixture of fused aminopyridine 3 and iminospirooxazine 4 derivatives. Similarly, pyrimidine derivatives 5 and 8 were obtained by the reaction of this intermediate 1 with formic acid and DMF‐DMA followed by hydrazine hydrate, respectively. The reaction of o‐amino‐thiophene dicarboxamide 2 at ambient temperature