10.1002/jlcr.2580340810
The research aimed to investigate the mechanism of tamoxifen-induced hepatic DNA adduct formation by synthesizing a tamoxifen derivative with a fully deuterated ethyl group, known as [D5-ethyl]-tamoxifen. The purpose was to probe the mechanism by which tamoxifen forms covalent DNA adducts, which is believed to be a consequence of liver cancer in rats and has implications for its use as a breast cancer preventative agent. The researchers hypothesized that cytochrome P-450 mediated α-oxidation of the ethyl group in tamoxifen is the key step in forming electrophilic alkylating agents capable of DNA adduct formation. The synthesis involved several chemicals, including 1-[4-(2-chloroethoxy)phenyl]-2-phenylethanone, sodium hydride, [D5]-iodoethane, phenyllithium, and dimethylamine, among others. The study concluded with the successful preparation of [D5-ethyl]-tamoxifen, which allows for the measurement of DNA adducts through 32P-postlabelling experiments, providing a tool to further understand the metabolic pathways and potential carcinogenic effects of tamoxifen.