Long Connection in BOS, can I use the sapphire lounge?

Will try to keep this brief. I have a 4:45 connection in BOS. I am flying into and out of terminal A and was wondering if I can go to terminal B to use the lounge and then go back to terminal A. I understand that I’ll have to clear security at terminal B and then again at terminal A. I have pre check and so am not too worried about that. Wondering, if I have will have an issue going through security at terminal B (given that I’m flying out of terminal A) and if I will be let into the sapphire lounge?

Thanks for your insights