A teenaged girl was robbed and pistol-whipped on Valencia Street on Friday by a gun-toting goon who fired a shot at her boyfriend when he came to her aid, cops said.

The 17-year-old victim was in the 100 block of Valencia Street around 7:20 p.m. when a man in his 30s held her up at gunpoint and demanded her purse, police said. The brute then struck the victim with the pistol and snatched the bag.

The crook fled and fired a shot when the victim’s boyfriend gave chase. The boyfriend was not struck. The gun-toting goon jumped into a green 4-door car and fled. No arrest has been made.

rnagle@sfexaminer.com