Everton and Alisson scored in the first half to level the quarter-final tie 2-2 on aggregate as Gremio progressed on away goals.
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Palmeiras reached the knockout phase thanks to a 4-0 rout of Melgar, while San Lorenzo also progressed despite their 1-0 loss to Junior.
Boca assistant Gustavo Barros Schelotto is expecting a tough battle in the Superclasico after his side booked a derby clash with River.
Goals from Dudu and Miguel Borja guided Palmeiras to another win over Colo-Colo.
Luiz Felipe Scolari's Palmeiras left with two priceless away goals in the quarter-final first leg thanks to Bruno Henrique and Dudu.
Miguel Borja scored a second-half brace away from home in Asuncion to put Palmeiras in a strong position on Thursday.