Condensations of 4.5-diaminopyrimidines and phosphonic diamides in a high-boiling solvent produce diaza- phospholopyrirnidine oxides. These are hydrolytically unstable and give rise to derivatives of N-pyrimidinyl- phosphonarnidic acid. ... BECAUSE of the general similarity of the molecular architecture of 1,3-diaza-l,3-dihydro-2-phospholo(4,5d)- pyrimidine 2-oxides (111) to that of purine the possibility that such compounds might show antipurine activity ...
![7-chloro-2-phenyl-1,3-dihydro-[1,3,2]diazaphospholo[4,5-d]pyrimidine 2-oxide Structure](https://image.chemsrc.com/caspic/188/7025-59-4.png)
![1H-1,3,2-Diazaphospholo[4,5-d]pyrimidin-7-amine,2,3-dihydro-N,N,2-trimethyl-, 2-oxide Structure](https://image.chemsrc.com/caspic/226/7025-58-3.png)
![N,N-dimethyl-8-oxo-8-phenyl-2,4,7,9-tetraza-8$l^C12H14N5OP-phosphabicyclo[4.3.0]nona-2,4,10-trien-5-amine Structure](https://image.chemsrc.com/caspic/041/7178-16-7.png)