Brendan Shanahan scored his team-leading 25th goal on a penalty shot in the third period for the Rangers, who have won two straight road games following the all-star break. New York has beaten Boston six consecutive times, including twice this month.
The Rangers were whistled for only four penalties, but registered two short-handed goals - one by Matt Cullen, and Shanahan's penalty shot that made it 5-1. Michael Nylander closed the scoring with a power-play goal at 7:39.
The Bruins have lost three straight - scoring just two goals - and are 3-9-1 in their last 13 games. Patrice Bergeron pulled Boston even at 1-1 on the power play in the first.
Cullen added two assists, and Jed Ortmeyer had three as the Rangers' third line dominated the first two periods. Defenceman Michal Rozsival scored in the second, assisted by Prucha and Cullen.
Ortmeyer came into the game with three points (one goal) in nine games, following a 40-game absence because of a pulmonary embolism. He scored a penalty-shot goal in the Rangers' 3-1 win over Boston on Jan. 13.