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Dalton DM, Walroth RC, Rouget-Virbel C, Mack KA, Toste FD. Utopia Point Bayesian Optimization Finds Condition-Dependent Selectivity for N-Methyl Pyrazole Condensation. J Am Chem Soc 2024; 146:15779-15786. [PMID: 38804885 PMCID: PMC11177315 DOI: 10.1021/jacs.4c01616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 05/10/2024] [Accepted: 05/13/2024] [Indexed: 05/29/2024]
Abstract
Utopia Point Bayesian Optimization (UPBO) was used to identify reaction conditions that are highly selective for the formation of N1 and N2-methyl-3-aryl pyrazole constitutional isomers. UPBO was used to explore a wide chemical space and identify basic reaction conditions for a typically acid-catalyzed Knorr pyrazole condensation. These studies revealed that selectivity in the reaction stems from a condition-dependent equilibrium of intermediates prior to dehydration. For the N2-methyl isomer reaction pathway, a hemiaminal intermediate was found to form reversibly under the reaction conditions, enabling a highly selective synthesis of the N2 isomer upon dehydrative workup. UPBO was able to successfully optimize conversion and selectivity simultaneously with search spaces of >1 million potential variable combinations without the need for high-performance computational resources.
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Affiliation(s)
- Derek M. Dalton
- Department
of Synthetic Molecule Process Chemistry, Genentech, Inc., South
San Francisco, California 94080, United States
| | - Richard C. Walroth
- Department
of Synthetic Molecule Process Chemistry, Genentech, Inc., South
San Francisco, California 94080, United States
| | - Caroline Rouget-Virbel
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Kyle A. Mack
- Department
of Synthetic Molecule Process Chemistry, Genentech, Inc., South
San Francisco, California 94080, United States
| | - F. Dean Toste
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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Rosa FA, Jacomini AP, Vieira da Silva MJ, Pianoski KE, Poletto J, Francisco CB, de Souza Fernandes C, Martinelli V, Pontes RM, Back DF, Moura S, Basso EA. Controlled Pyrazole-Hydrazone Annulation: Regiodivergent Synthesis of 1 H- and 2 H-Pyrazolo[3,4- d]pyridazinones. J Org Chem 2023. [PMID: 37463494 DOI: 10.1021/acs.joc.3c01117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
An efficient and controlled site-selective annulation of 3,5-diethoxycarbonyl 4-hydrazonyl pyrazoles is described. The relative proportion of the products is affected by hydrazone intermediate configuration, reaction temperature, and Lewis acid employed. At a temperature of 110-120 °C, the reaction preferentially afforded 1H-pyrazolo[3,4-d]pyridazin-7(6H)-ones, whereas using Yb(OTf)3 in MeCN reflux, 2H-pyrazolo[3,4-d]pyridazin-7(6H)-ones were favored. Computational investigations were performed to clarify the mechanism and the origin of the regiodivergence.
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Affiliation(s)
- Fernanda Andreia Rosa
- Chemistry Departament, State University of Maringa, Maringa, Parana 87020-900, Brazil
| | | | | | | | - Julia Poletto
- Chemistry Departament, State University of Maringa, Maringa, Parana 87020-900, Brazil
| | | | | | - Vinicius Martinelli
- Chemistry Departament, State University of Maringa, Maringa, Parana 87020-900, Brazil
| | | | - Davi Fernando Back
- Chemistry Departament, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul 97110-970, Brazil
| | - Sidnei Moura
- Biotechnology Departament, University of Caxias do Sul, Caxias do Sul, Rio Grande do Sul 295070-560, Brazil
| | - Ernani Abicht Basso
- Chemistry Departament, State University of Maringa, Maringa, Parana 87020-900, Brazil
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Recent Advances in Synthesis and Properties of Pyrazoles. CHEMISTRY 2022. [DOI: 10.3390/chemistry4030065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Pyrazole-containing compounds represent one of the most influential families of N-heterocycles due to their proven applicability and versatility as synthetic intermediates in preparing relevant chemicals in biological, physical-chemical, material science, and industrial fields. Therefore, synthesizing structurally diverse pyrazole derivatives is highly desirable, and various researchers continue to focus on preparing this functional scaffold and finding new and improved applications; this review highlights some of the most recent and strategic examples regarding the synthesis and properties of different pyrazole derivatives, mainly reported from 2017–present. The discussion involves strategically functionalized rings (i.e., amines, carbaldehydes, halides, etc.) and their use in forming various fused systems, predominantly bicyclic cores with 5:6 fusion taking advantage of our experience in this field and the more recent investigations of our research group.
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