“The detailed biosynthetic pathways of the purine biosynthesis came later in 1950 primarily by the works of Buchanan and G. Rober Greenberg.”
Science went down to the atomic assembly level in 1950. You are nearly 70 years behind the times. We know the atom by atom process of building molecules in cells, and it involves enzymes, not super-intelligences. You can check out the link above for all of the details.