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April 16, 2013
What's Translational Synthesis, Anyway?
There's another paper in the Nature Chemical Biology special issue that I wanted to mention, this one on "Translational Synthetic Chemistry". I can't say that I like the title, which seems to me to have a problem with reification (the process of trying to make something a thing which isn't necessarily a thing at all). I'm not so sure that there is a separate thing called "Translational Synthetic Chemistry", and I'm a bit worried that it might become a catch phrase all its own, which I think might lead to grief.
But that said, I still enjoyed the article. The authors are from H3 Biomedicine in Cambridge, which as I understand it is an offshoot of the Broad Institute and has several Schreiber-trained chemists on board. That means Diversity-Oriented Synthesis, of course, which is an area that I've expressed reservations about before. But the paper also discusses the use of natural product scaffolds as starting materials for new chemical libraries (a topic that's come up here and here), and the synthesis of diverse fragment collections beyond what we usually see. "Fragments versus DOS" has been set up before as a sort of cage match, but I don't think that has to be the case. And "Natural products versus DOS" has also been taken as a showdown, but I'm not so sure about that, either. These aren't either/or cases, and I don't think that the issues are illuminated by pretending that they are.
The authors end up calling for more new compound libraries, made by more new synthetic techniques, and assayed by newer and better high-throughput screens. Coming out against such recommendations makes a person feel as if they're standing up to make objections against motherhood and apple pies. And it's not that I think that these are bad ideas, but I just wonder if they're sufficient. Chemical space, as we were discussing the other day, is vast - crazily, incomprehensibly vast. Trying to blast off into it at random (which is what the pure DOS approaches have always seemed like to me) looks like something that a person could do for a century or two without seeing much return.
So if there are ways to increase the odds, I'm all for them. Natural-product-like molecules look like as good a way as any to do this, since they at least have the track record of evolution on their side. Things that are in roughly these kinds of chemical space, but which living organisms haven't gotten around to making, are still part of a wildly huge chemical space, but one that might have somewhat higher hit rates in screening. So Paul Hergenrother at Illinois might have the right idea when he uses natural products themselves as starting materials and makes new compound libraries from them.
So, who else is doing something like that? And what other methods do we have to make "natural-product-like" structures? Suggestions are welcome, and I'll assemble them and any ideas I have into another post.
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