The application of combinatorial chemistry principles to produce libra
ries of compounds, together with effective use of high-throughput biol
ogical screening, is sei to revolutionize the way in which chemical le
ads for drug discovery programmes are generated and evaluated. In th i
s overview, solution-phase synthesis is compared and contrasted with s
olid-phase synthesis, which remains the method of choice for most comb
inatorial library work. The author discusses a variety of specific app
roaches from different groups exemplifying the potential of solution-p
hase work.