Cdc7 kinase has recently emerged as an attractive target for cancer therapy and low- molecular-weight inhibitors of Cdc7 kinase have been found to be effective in the inhibition of tumor growth in animal models. In this paper, we describe synthesis and structure− activity relationships of new 1 H-pyrrolo [2, 3-b] pyridine derivatives identified as inhibitors of Cdc7 kinase. Progress from (Z)-2-phenyl-5-(1 H-pyrrolo [2, 3-b] pyridin-3-ylmethylene)-3, 5- ...