A. Santagati et al., Synthetic route to 4,5-dihydro-9H-pyrido[1,2-a] thieno[3,2-e]pyrimidine derivatives through 1,3-dipolar cycloaddition, J CHEM R-S, (8), 2001, pp. 304-306
A synthetic route to the title heterocyclic system through 1,3-dipolar cycl
oaddition of the mesoionic compound 9 with DMAD is described. The structure
elucidation of the above system is also reported.