We previously reported that compound 1, having a similar conformation to PTK787 (2) by forming a pseudo ring structure with an intramolecular non-bonded S–O interaction, exhibited a potent inhibitory activity against VEGFR2 tyrosine kinase (KDR). 1 Applying the ideas of pseudo ring formations, we have designed three types of novel indole carboxamide derivatives 5–7 with an intramolecular hydrogen bonding or non-bonded S–O interaction. ...