Quintero scored in the 109th moment of the second leg before colleague Gonzalo Martinez wrapped up a 3-1 triumph on the night for River - and a 5-3 win on the total.
Martinez ran the ball into an unfilled net with the last kick of the diversion after Boca attendant Esteban Andrada had been gotten upfield at a corner.
That finished an emotional additional day and age, which had begun with the sending-off of Boca midfielder Wilmar Barrios for a second bookable offence - a two-footed test on Exequiel Palacios.
Martinez's objective finished an emotional turnaround in a match moved in excess of 6,000 miles from Buenos Aires, in Argentina, to the Spanish capital after its delay in November, when Boca's group transport was assaulted by River fans, making damage players and staff.
Dario Benedetto had terminated Boca into the lead in a matter of seconds before half-time at Real Madrid's Bernabeu Stadium.
Benedetto completed off an overwhelming counter-assault and celebrated by staying his tongue out at River protector Gonzalo Montiel.
Previous Barcelona striker Lucas Pratto levelled for River in the second half, when he opened home a reduction toward the finish of a smooth passing move.
The group spent most of the match standing up - and numerous River fans were seen crying with joy when their group evened out. Those supporters were woozy with bliss as their group returned to win in the extra 30 minutes.
It was the first run through in the 58-year history of the Copa Libertadores that the two incredible Buenos Aires rivals have confronted each other in the two-legged last, with the principal leg, on 11 November, finishing in a 2-2 draw.
The development to this massively foreseen installation was brimming with discussion after the second leg - initially booked for 24 November - was deferred because of the transport assault.
Boca players experienced cuts broken windows when their group transport was assaulted by River fans and was likewise influenced by the nerve gas utilized by police to scatter the groups.
Various players, including Boca's Carlos Tevez - the previous Manchester City, Manchester United and Juventus striker - apparently experienced discombobulation and heaving.
Boca contended River ought to have been precluded from the opposition, however, a late endeavour to delay Sunday's rescheduled second leg coordinate was dismissed by the Court of Arbitration for Sport (Cas).
The Copa Libertadores is the show-stopper club rivalry in South America, proportional to the Champions League in Europe, and there were a few commonly recognized names in participation at the Bernabeu, including Barcelona's Lionel Messi and Juventus' Pablo Dybala.
The two Buenos Aires sides met before 72,000 fans at the Bernabeu, where the match was moved trying to maintain a strategic distance from further group unsettling influence.
Be that as it may, the choice to move the last of South America's greatest football rivalry to another mainland was enormously condemned, with various fans unfit to travel in light of the expense of the excursion.
Stream Plate and Boca Juniors were each given 5,000 tickets, yet just 4,000 fans from each club travelled to Spain. Another 20,000 tickets, which were most readily accessible to Real Madrid individuals, sold out inside hours.
Inside the Bernabeu, an empty square of seats went about as a cradle between the two arrangements of supporters. The street outside was shut for the whole day and around 2,500 cops were on the obligation.
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