Joshua Jefferson recorded 19 points, eight rebounds, five assists and three steals to lead No. 12-ranked Iowa State to a 76-56 victory over Cincinnati on Wednesday afternoon in the second round of the Big 12 tournament at Kansas City.Tamin Lipsey scored 16 points and Milan Momcilovic added 13 for the fifth-seeded Cyclones (24-8). Dishon Jackson registered 10 points and a career-best 15 rebounds.Jizzle James scored 17 points but was just 6-of-20 shooting for 13th-seeded Cincinnati (18-15). Josh Reed added 10 points for the Bearcats.Iowa State, the fifth seed, will face fourth-seeded BYU (24-8) in Thursday’s quarterfinals. The No. 17-ranked Cougars have won eight straight games.Lipsey exited with an apparent groin injury with 3:05 remaining.The Cyclones shot 53.7 percent from the field, including 10 of 21 from 3-point range. Iowa State held a 41-23 rebounding advantage.Cincinnati made 32.8 percent of its shots and was 9-of-30shooting from behind the arc.The Bearcats trailed by nine at halftime before creeping within 43-40 on Dillon Mitchell’s dunk with 14:32 left in the game.Iowa State answered with six straight points with Lipsey’s layup making it a nine-point margin with 12:56 remaining.Cincinnati was back within 51-46 after a dunk by Aziz Bandaogo with 10:46 to play but Lipsey answered with a 3-pointer.