Donarski scored 20 points as the Tar Heels dispatched the Eagles to qualify for the conference's final eight for the third time in four seasons.
Boston College took a nine-point second-half lead, but the Tar Heels used a 19-3 run to retake the lead and advance in the tournament.
Kon Knueppel scored 17 points and Tyrese Proctor and Sion James both notched 16, and No. 2 Duke responded from a seven-point deficit in the second half to beat rival North Carolina 82-69 on Saturday night at Chapel Hill,
Percentages: FG 43.939, FT .611. 3-Point Goals: 9-22, .409 (Donarski 5-11, Crisp 2-3, Nivar 1-1, Grant 1-3, Townsend 0-2, Ustby 0-1, Hull 0-1) Turnovers: 15 (Gakdeng 3, Nivar 3, Donarski 2, Townsend 2, Grant 2, Ustby 1, Thomas 1, Crisp 1) Percentages: FG 43.333, FT .875.