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Organic synthesis in mass spectrometry: 1. Mechanistic studies of iodine (III)-promoted oxidations. 2. Synthesis of new MALDI-MS matrices.

Grant number: 14/21182-2
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): October 01, 2015
Effective date (End): September 30, 2017
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Organic Chemistry
Principal researcher:Marcos Nogueira Eberlin
Grantee:Bruno Ricardo Silva de Paula
Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

Hypervalent iodine chemistry has gained a significant amount of attention among chemists over the last decades. Due to their great potential as reagents and catalysts in organic synthesis, detailed understanding of the mechanisms by which these reactions occur is crucial for the advance of this branch of organic chemistry. In this sense, mass spectrometry has emerged as a powerful toll in the elucidation of reaction mechanisms, making it possible not only the detection of reagents and products, but also transient reaction intermediates. A significant advance in the use of mass spectrometry was its association with ion mobility spectrometry, making the resolution of isomeric compounds possible. Thus, in this project we intend to study in depth the mechanisms by which several iodine (III)-mediated reactions occur by ESI-MS. To this end, we will synthesize charge-tagged iodoarenes, which will act as pre-catalysts. In the next phase of this project, we will synthesize chiral charge-tagged iodoarenes, and use them as pre-catalysts in asymmetric version of these oxidations; in this case, the mechanistic studies will be performed by ESI-MS as well as by ESI-MS coupled with IMS.In a second part of this work, we intend to evaluate novel MALDI-MS matrices. Despite wide availability of commercial matrices, their structural and functional diversities are relatively small, and so are efforts in the development of matrices based on non-conventional organic acids and bases. Thus, we intend to synthesize and evaluate the potential of new matrices based on several different 1-alkylpyridinium salts. Moreover, we intend to synthesize new matrices based on cinnamic acids using Morita-Baylis-Hillman adducts as starting materials.

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