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Title:A small molecule synthesizer
Author(s):Ballmer, Steven
Director of Research:Burke, Martin D.
Doctoral Committee Chair(s):Burke, Martin D.
Doctoral Committee Member(s):Denmark, Scott E.; Moore, Jeffrey S.; Kenis, Paul J.A.
Department / Program:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):iterative cross-coupling
automated synthesis
small molecule synthesis
Abstract:Despite many advances over the last two centuries, small molecule synthesis remains a relatively complex, unsystematized, and time-intensive process practiced almost exclusively by highly trained specialists. Collectively, these limitations represent a major bottleneck in the efforts to study, understand, and harness the vast functional capacity of small molecules. In an effort to shift the rate-limiting step of small molecule science from synthesis to function study, we have designed, constructed, and implemented a fully automated small molecule synthesizer. The synthesizer uses only one C-C bond forming reaction, the Suzuki-Miyaura cross-coupling (SMC) reaction, to assemble off-the-shelf building blocks into many different types of small molecules including organic materials, pharmaceuticals, natural products, and natural product derivatives. Specifically, this automated synthesis platform utilizes the iterative cross-coupling (ICC) strategy enabled by the capacity of N-methyliminodiacetic acid (MIDA) to reversibly attenuate the reactivity of a boronic acid. MIDA boronates are generally crystalline free-flowing solids and are stable to bench-top storage. Furthermore, it has been discovered that they are universally amenable to catch-and-release column chromatography and are universally susceptible to general mild deprotection conditions. Additionally, MIDA boronates can be prepared by a variety of synthetic methods on multi-gram scale and they demonstrate significantly improved reaction yields with slow-addition cross-coupling (SACC). It was understood that these strikingly general features of MIDA boronates made them highly amenable to an automated ICC platform. Fully automated modules for MIDA boronate purification, deprotection, and cross-coupling were developed and with thousands of applicable building blocks commercially available or easily accessible, this now simple, general, and fully automated synthesis platform stands to afford more efficient access to small molecule targets to specialists and non-specialists alike.
Issue Date:2013-08-22
Rights Information:Copyright 2013 Steven G. Ballmer
Date Available in IDEALS:2013-08-22
Date Deposited:2013-08

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