I have tried to find the original paper and some justification for using it, but so far no luck.
Well, now it is well proved that the performance of Suzuki-coupling is excellent with dioxane as a sole solvent in case of Pd or Non-Pd catalysts. You can find a lot of references in this issue.
But, we don't have sufficient reference about the aqueous dioxane binary solvent system in Suzuki coupling.
Although, it seems that, aqueous dioxane has some great advances in solubility of both hetero and homogeneous catalytic system, their has some drawbacks as well as.
Anyway, from the following link you can find your references on "aqueous dioxane binary solvent system used for Suzuki cross-coupling reactions". Hope you will find your answer....good luck!
1. http://www.sciencedirect.com/science/article/pii/S0040403999002397#
2. http://pubs.rsc.org/en/content/articlelanding/2003/cc/b211742h#!divAbstract
A possible explanation is that water can help the solubilization of the base (OH-) and this favor the formation of the reactive OXO-palladium intermediate that has been proposed in the transmetallation step (Org. Lett. 2006, 8, 4071; J. Org. Chem. 1998, 63, 461; Angew. Chem. Int. Ed. 2013, 52, 7362).
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