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May 13, 2013
Pyrrolidines, Not the Usual Way
I wanted to mention a new reaction that's come out in a paper in Science. It's from the Betley lab at Harvard, and it's a new way to make densely substituted saturated nitrogen heterocycles (pyrrolidines, in particular).
You start from a four-carbon chain with an azide at one end, and you end up with a Boc-protected pyrrolidine, by direct activation/substitution of the CH bond at the other end of the chain. Longer chains give you mixtures of different ring sizes (4, 5, and 6), depending on where the catalyst feel like inserting the new bond. I'd like to see how many other functional groups this chemistry is compatible with (can you have another tertiary amine in there somewhere, or a hydroxy?) But we have a huge lack of carbon-hydrogen functionalization reactions in this business, and this is a welcome addition to a rather short list.
There was a paper last year from the Groves group at Princeton on fluorination of aliphatic CH bonds using a manganese porphyrin complex. These two papers are similar in my mind - they're modeling themselves on the CYP enzymes, using high-valent metals to accomplish things that normally we wouldn't think of being able to do easily. The more of this sort of thing, the better, as far as I'm concerned: new reactions will make us think of entirely new things
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