This is such an important point. Also, you are inheriting a problem that began in preschool. You need to work to undo it, or it is possible that this will always be a struggle. You might not still be chasing him around the house in 5 years, but older kids have other ways of ignoring their parents or fighting with them. I think starting as slowly as you can, rewinding a fair amount. Like pp's said, reduce the paperwork, the busy work, and start with one tiny moment. Then expand from there. Which moment? Well, you need to look at your day and see where he is least resistant.
Also, this is a new relationship between you and your son. Big adjustment! Suddenly storytime isn't fun anymore, it's *work*! Parents want *results*. So, resist the urge to make storytime into a lesson, for example. Just add a bit of time at the end where he practices reading. Use a baby board book with one word on each page. have him read one page, one word. Start small, then expand from there.
So, more important than the results of his schoolwork is getting him to not struggle so much with doing it. Nevermind what he is learning at first, just work at creating an enjoyable time for you, then from this point you can eventually expand to be something more.