methods for the compound are simple and direct, but are not effective for the direct synthesis of indoloquinazolinone with a methylene group at the C‐6 position. A palladium(0)‐catalyzed cyclization of chloroquinazolinone viaCHfunctionalization was developed for a concise synthesis of indoloquinazolinone derivatives. The presence of a substituent at the C‐6 position is important for obtaining the