Bowden, 25, was one of three supplemental first-round picks by Boston in 2005 along with Clay Buchholz and Jed Lowrie. The right-hander has a 3.27 ERA with 7.1 K/9 and 3.0 BB/9 in parts of four Triple-A seasons. Bowden has also appeared in 39 big league games for the Red Sox over the last five years.
Exposito, also 25, moved up to Triple-A Pawtucket last season and hit .242/.298/.367 with eight homers in 359 plate appearances. The catcher was briefly called up to the Red Sox last June but did not appear in a game.