ORGN 652 |
The development of general synthetic routes to amino-boronic acid systems, and investigations into their use as potential bifunctional catalysts for a variety of transformations has been undertaken. Three new derivatives of N,N-diisopropylbenzylamine-2-boronic acid 1a have been prepared by directed metallation-borylation methods and their activity assessed on the direct amide condensation. Whilst the addition of an electron withdrawing group (1b and 2) does not substantially improve the reactivity of such systems, incorporation of an electron donating group (1c) results in considerably lower catalyst reactivity. A Design of Experiments (DoE) study has been undertaken and the results used as a basis to improve isolated yields for more problematic substrates. |
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Asymmetric Reactions and Syntheses
8:00 AM-12:00 PM, Wednesday, August 22, 2007 BCEC -- 253 A/B/C, Oral
Division of Organic Chemistry |