Bojan scored a 39th-minute penalty after a Danny Simpson handball and Joe Allen tapped in a second just before the break.
The usually unflappable Claudio Ranieri was so incensed by referee Craig Pawson's decisions that Leicester keeper Kasper Schmeichel had to pull his manager away from the official at halftime.
After beating Manchester City last weekend, Leicester may have felt their season had turned and they showed real courage to fight back with a header from substitute Leonardo Ulloa and another in the 88th minute from Daniel Amartey, his first goal for the club.
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(Reporting by Ian Chadband; Editing by Tony Jimenez)
