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Caltech chemists devise chemical reaction that holds promise for new drug development
Date:1/11/2012

ures we're after," Stoltz says. "We're taking that up another notch by making carbon-carbon bonds in really challenging scenarios. We're making carbon centers that have four other carbon groups around them, and that's very hard to do."

The vast majority of pharmaceuticals being made today do not include such congested carbon centers, Stoltz saysnot so much because they would not be effective compounds, but because they have been so difficult to make. "But now," he says, "we've made it very easy to make those very hindered centers, even in compounds that contain nitrogen. And that should give pharmaceutical companies new possibilities that they previously couldn't consider."

Perhaps the most important feature of the reaction is that it yields almost 100 percent of just one version of its product. This is significant because many organic compounds exist in two distinct versions, or enantiomers, each having the same chemical formula and bond structure as the other, but with functional groups in opposite positions in space, making them mirror images of each other. One version can be thought of as right-handed, the other as left-handed.

The problem is that there is often a lock-and-key interaction between our bodies and the compounds that act upon themonly one of the two possible hands of a compound can "shake hands" and fit appropriately. In fact, one version will often have a beneficial effect on the body while the other will have a completely different and sometimes detrimental effect. Therefore, it is important to be able to selectively produce the compound with the desired handedness. For this reason, the FDA has increasingly required that the molecules in a particular drug be present in just one form.

"So not only are we making tricky carbon-carbon bonds, we're also making them such that the resulting products have a particular, desired handedness," Stoltz says. "This was the culmination of six years of work. There was essentia
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Contact: Deborah Williams-Hedges
debwms@caltech.edu
626-395-3227
California Institute of Technology
Source:Eurekalert  

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