BOSTON >> Jayson Tatum caught a pass underneath the basket, shook off a hit and went up for the go-ahead layup with 23 seconds left and the Boston Celtics beat the Philadelphia 76ers 114-112 on Wednesday night to advance to the Eastern Conference finals.Tatum scored 25 points, Jaylen Brown had 24 and Terry Rozier 17, sinking a pair of free throws after forcing Joel Embiid's turnover in the final seconds.