Dundee United booked their place in Monday's IRN-BRU Cup quarter-final draw with a 1-0 win against Stranraer on Saturday.
Tony Andreu got the only goal midway through the second half as Ray McKinnon's men knocked out Brian Reid's League 1 side at Stair Park.
Greig Spence grabbed a double and Jon Robertson and Kevin Cawley were also on target as Alloa Athletic won 4-2 away to Welsh side Bala Town.
St Mirren came from behind to defeat Hibernian 2-1 at Easter Road. Alex Harris gave Hibs the lead but Stevie Mallan equalised and David Clarkson struck with eight minutes left.
Dunfermline Athletic beat Queen's Park 2-1 at East End Park thanks to a double from Farid El Alagui, whose own goal gave the visitors a consolation.
Ladbrokes League 2 leaders Forfar Athletic went down 3-1 to Welsh champions The New Saints at Station Park. Greg Draper hit a hat-trick, with Stuart Malcolm scoring for the Loons.
