5-Bromoethynyluracil and its deoxyriboside can be prepared in good yie
lds starting from dibromovinyluracil, which is accesible by literature
methods. 5-Bromoethynyl-deoxyuridine is less effective against HSV-I
than E-(bromovinyl)deoxyuridine but, similar to BVDU, seems to exhibit
a certain selectivity toward HSV-1. Molecular calculations prove the
spatial similarity of both compounds.