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Turmanov RA, Smolobochkin AV, Gazizov AS, Rizbayeva TS, Zapylkin DD, Voronina JK, Voloshina AD, Syakaev VV, Kurenkov AV, Burilov AR, Pudovik MA. Enamine-mediated Mannich reaction of cyclic N, O-acetals and amido acetals: the multigram synthesis of pyrrolidine alkaloid precursors. Org Biomol Chem 2022; 20:7105-7111. [PMID: 36043377 DOI: 10.1039/d2ob01276f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cooperative L-proline/Brønsted acid/base promoted reaction of 2-ethoxypyrrolidines or N-substituted 4,4-diethoxybutan-1-amines with methyl(alkyl/aryl)ketones for the synthesis of 2-(acylmethylene)pyrrolidine derivatives is reported. The key features of the developed protocol are gram-scale synthesis of the target compounds, easily available starting materials, operational simplicity and usage of non-expensive reagents.
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Affiliation(s)
- Rakhymzhan A Turmanov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Andrey V Smolobochkin
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Almir S Gazizov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Tanzilya S Rizbayeva
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Danil D Zapylkin
- Kazan National Research Technological University, 420015, K. Marksa str. 68, Kazan, Russian Federation
| | - Julia K Voronina
- N.S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninsky Ave. 31, 119991 Moscow, Russia.,G.V. Plekhanov Russian University of Economics, Stremyanny Per. 36, 117997 Moscow, Russia
| | - Alexandra D Voloshina
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Victor V Syakaev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Alexey V Kurenkov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Alexander R Burilov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
| | - Michail A Pudovik
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center, Russian Academy of Sciences, Arbuzova str., 8, Kazan, Russian Federation.
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Čierna M, Berkeš D, Baran P, Šoral M, Kolarovič A, Jakubec P. Stereochemical switch driven by crystallization: Interplay between stoichiometry and configuration of the products. Chirality 2022; 34:948-954. [PMID: 35470504 DOI: 10.1002/chir.23451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Revised: 04/08/2022] [Accepted: 04/08/2022] [Indexed: 11/09/2022]
Abstract
An intriguing example of a crystallization-induced stereochemical switch in the configuration of aza-Michael reaction products is described. Depending on both the stereochemical purity and stoichiometric ratio of the chiral amine used, the reaction delivers crystalline diastereomers of a different stereochemistry. The optically pure diastereomer smoothly converts to its racemic epimer salt upon the addition of a complementary chiral amine.
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Affiliation(s)
- Michaela Čierna
- Institute of Organic Chemistry, Catalysis and Petrochemistry, Slovak University of Technology, Bratislava, Slovakia
| | - Dušan Berkeš
- Institute of Organic Chemistry, Catalysis and Petrochemistry, Slovak University of Technology, Bratislava, Slovakia
| | - Peter Baran
- Department of Chemistry and Biochemistry, Juniata College, Huntington, Pennsylvania, USA
| | - Michal Šoral
- Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Andrej Kolarovič
- Department of Chemistry, Faculty of Education, Trnava University, Trnava, Slovakia
| | - Pavol Jakubec
- Institute of Organic Chemistry, Catalysis and Petrochemistry, Slovak University of Technology, Bratislava, Slovakia
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