Photochemistry of nucleoside transport inhibitor 6-S-benzylated thiopurine ribonucleosides. Implications for a new class of photoaffinity labels
摘要:
Photochemistry of the nucleoside transport inhibitor 6-[(4-nitrobenzyl)thio]-9-(beta-D-ribofuranosyl)purine (NBMPR, 1) yielded products from the initial homolytic cleavage of the benzyl-sulfur bond. Photoreduction of the nitro group also occurred to a minor extent. The quantum yield for the disappearance of 1 was approximately 0.04. Several photoproducts and secondary photoproducts were identified and confirmed by synthesis. Irradiation of 6-(benzylthio)-9-(beta-D-ribofuranosyl)purine (BMPR, 3) also resulted in the formation of products from benzyl-sulfur cleavage with a quantum yield of approximately 0.01.