How are drugs distributed in regards to bone marrow?
How are drugs distributed into any tissue, and what affects it?
Note that there are no general answers, and that this is highly dependent on the drug in question.
Active or passive transport
Is your drug a substrate for any uptake or efflux transporters that may affect the distribution?
Solubility
Lipophilic drugs will generally have a greater volume of distribution, as there is more passive diffusion into tissue.
Blood flow
How much drug is presented to the area in question? Tissue with greater perfusion (e.g. kidneys) will have a greater exposure to the drug. Look up the well-stirred model.
Relating this to the blood marrow
So what should you research in order to answer your question?

What are the physiochemical properties of the drug in question? How are these compared to other drugs where the bone marrow is a target?
Is the drug a substrate for any relevant transporters in the tissue of interest?

You should also look up if there are any physiologically-based pharmacokinetic (PBPK) models for your drug or drugs with similair physiochemical properties. Some of these are free, and allow you to make general assumptions about the distribution of the drug.