It'd be worthwhile for you to discuss and argue the process in your company. Having worked in startups like that, there will be times when developers will say, "I need some time without distractions. I'm going to be way over there; please don't disturb unless it's a serious emergency." As far as I've seen, people have been completely understanding of this.

Discussing it might not work if your boss/coworkers aren't good at grokking your needs, but their priority should really be to enhance your productivity the way you need it enhanced, not to force you to conform to their style.