Variously substituted 7-deazaguanines are of interest as inhibitors of GTP cyclohydrolase I, the first enzyme in the biosynthetic pathway leading to dihydrofolate and tetrahydrobiopterin. Methods are described for the synthesis of 7-deazaguanines substituted at positions 2, 6 and 9 (purine numbering) such that a wide diversity of compounds can be prepared. These methods supplement our previous work that established routes for the synthesis of 7- and 8-substituted 7-deazaguanines. Emphasis is placed on the properties of 2-thioalkyl pyrimidines as intermediates because they provide the basis for a traceless solid-state synthesis of purines, pteridines, and their analogues. Compounds prepared have been assessed in a primary screen for their ability to inhibit GTPCH I and 8-methyldeazaguanine has been shown to be significantly more potent than any inhibitor yet described. Several compounds appeared to undergo transformation by GTPCH I; with the aid of a model reaction, their behaviour can be interpreted in the context of the mechanism of the hydrolytic phase of GTPCH I.
- Purine analogues
- GTP cyclohydrolase 1
Gibson, C. L., La Rosa, S., Ohta, K., Boyle, P. H., Leurquin, F., Lemaçon, A., & Suckling, C. J. (2004). The synthesis of 7-deazaguanines as potential inhibitors of guanosine triphosphate cyclohydrolase 1. Tetrahedron, 60(4), 943-959. https://doi.org/10.1016/j.tet.2003.11.030