Good answer, Discodermolide.
The chemistry in the Journal of Medicinal Chemistry is usually pretty basic - chemists working on medicinal chemistry projects are typically using workhouse reactions to make testable quantities of material and aren't particularly interested in optimizing reaction conditions to get high yields. As long as the reaction gives enough material to put into a vial, that's good enough. Identification of the materials and structural proofs are very important, however, so the analytical data for the compounds is as good as any other chemistry journal, and better than most.
If you are interested in newly discovered chemistry or in optimization of chemical reactions for particular substrates, J Med Chem isn't a particularly good starting point.