The overall goal of this program is to develop new methods for the synthesis of nitrogen-containing molecules of biomedical interest. This work has focused on techniques for the introduction of a substituted nitrogen atom via new reactions of alkyl azides that are closely related to the classical Schmidt reaction of hydrazoic acid. It is our intention to develop new aspects of these methods that will extend their reach and deepen our understanding of the mechanistic principles underlying them. The utility of these techniques for nitrogen introduction will be demonstrated in the context of alkaloid total synthesis. These projects allow us to examine our new methodologies in the challenging context of """"""""real-world"""""""" targets and to develop new techniques as specific problems arise.
The specific aims of the present proposal are:
Specific Aim 1 : Examine New Aspects of Alkyl Azide Chemistry. The main subgoals during the proposed funding period will be to (a) investigate reactions that lead to bridged bicyclic amides or derivatives thereof, (b) explore the reactions of azides with oxyallyl cations, such as those derived from cyclopropanone ketals, (c) develop the vinylogous Schmidt reaction of alkyl azides, and (d) look into possible modes of stereocontrol in the reactions of alkyl azides with ketones.
Specific Aim 2. Extend the Utility of in Situ Tethering in Heterocycle Synthesis. This section of the proposal concerns the continued development, and stereochemical investigation of the reactions of ketones with hydroxyalkyl azides (the Boyer reaction) and the manipulation of the resulting iminium ethers. Specifically, this entails the continued exploration of asymmetric lactam synthesis by (a) experimental and (b) computational means, as well as experiments that address (c) the kinetic resolution of lactams and (d) the continued development of the three-component coupling reaction.
Specific Aim 3. Synthesize Stenine and Stemspironine.
Specific Aim 4. Synthesize the Dendrobatid Alkaloid 251F.
Specific Aim 5. Synthesize Cylindricine C.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM049093-12
Application #
6744774
Study Section
Medicinal Chemistry Study Section (MCHA)
Program Officer
Schwab, John M
Project Start
1993-05-01
Project End
2005-04-30
Budget Start
2004-05-01
Budget End
2005-04-30
Support Year
12
Fiscal Year
2004
Total Cost
$229,890
Indirect Cost
Name
University of Kansas Lawrence
Department
Pharmacology
Type
Schools of Pharmacy
DUNS #
076248616
City
Lawrence
State
KS
Country
United States
Zip Code
66045
Fehl, Charlie; Hirt, Erin E; Li, Sze-Wan et al. (2015) Temperature dependence of turnover in a Sc(OTf)3-catalyzed intramolecular Schmidt reaction. Tetrahedron Lett 56:3137-3140
Szostak, Roman; Aubé, Jeffrey; Szostak, Michal (2015) Determination of Structures and Energetics of Small- and Medium-Sized One-Carbon-Bridged Twisted Amides using ab Initio Molecular Orbital Methods: Implications for Amidic Resonance along the C-N Rotational Pathway. J Org Chem 80:7905-27
Szostak, Roman; Aubé, Jeffrey; Szostak, Michal (2015) An efficient computational model to predict protonation at the amide nitrogen and reactivity along the C-N rotational pathway. Chem Commun (Camb) 51:6395-8
Singh, Gurpreet; Meyer, Angelica; Aubé, Jeffrey (2014) Stereodivergent synthesis of enantioenriched 4-hydroxy-2-cyclopentenones. J Org Chem 79:452-8
Szostak, Michal; Aubé, Jeffrey (2013) Chemistry of bridged lactams and related heterocycles. Chem Rev 113:5701-65
Motiwala, Hashim F; Fehl, Charlie; Li, Sze-Wan et al. (2013) Overcoming product inhibition in catalysis of the intramolecular Schmidt reaction. J Am Chem Soc 135:9000-9
Motiwala, Hashim F; Gulgeze, Belgin; Aube, Jeffrey (2012) Copper-catalyzed oxaziridine-mediated oxidation of C-H bonds. J Org Chem 77:7005-22
Liu, Ruzhang; Gutierrez, Osvaldo; Tantillo, Dean J et al. (2012) Stereocontrol in a combined allylic azide rearrangement and intramolecular Schmidt reaction. J Am Chem Soc 134:6528-31
Gutierrez, Osvaldo; Aube, Jeffrey; Tantillo, Dean J (2012) Mechanism of the acid-promoted intramolecular schmidt reaction: theoretical assessment of the importance of lone pair-cation, cation-ýý, and steric effects in controlling regioselectivity. J Org Chem 77:640-7
Huh, Chan Woo; Schroeder, Chad; Singh, Gurpreet et al. (2011) Stereoselectivity in nucleophilic additions to 3-azidoalkanals. J Org Chem 76:3160-5

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