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Parmar MP, Vala DP, Bhalodiya SS, Upadhyay DB, Patel CD, Patel SG, Gandholi SR, Shaik AH, Miller AD, Nogales J, Banerjee S, Padrón JM, Amri N, Kandukuri NK, Patel HM. A green bio-organic catalyst (taurine) promoted one-pot synthesis of ( R/ S)-2-thioxo-3,4-dihydropyrimidine(TDHPM)-5-carboxanilides: chiral investigations using circular dichroism and validation by computational approaches. RSC Adv 2024; 14:9300-9313. [PMID: 38505382 PMCID: PMC10949965 DOI: 10.1039/d4ra01391c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 02/29/2024] [Indexed: 03/21/2024] Open
Abstract
Owing to the massive importance of dihydropyrimidine (DHPMs) scaffolds in the pharmaceutical industry and other areas, we developed an effective and sustainable one-pot reaction protocol for the synthesis of (R/S)-2-thioxo-DHPM-5-carboxanilides via the Biginelli-type cyclo-condensation reaction of aryl aldehydes, thiourea and various acetoacetanilide derivatives in ethanol at 100 °C. In this protocol, taurine was used as a green and reusable bio-organic catalyst. Twenty-three novel derivatives of (R/S)-TDHPM-5-carboxanilides and their structures were confirmed by various spectroscopy techniques. The aforementioned compounds were synthesized via the formation of one asymmetric centre, one new C-C bond, and two new C-N bonds in the final product. All the newly synthesized compounds were obtained in their racemic form with up to 99% yield. In addition, the separation of the racemic mixture of all the newly synthesized compounds was carried out by chiral HPLC (Prep LC), which provided up to 99.99% purity. The absolute configuration of all the enantiomerically pure isomers was determined using a circular dichroism study and validated by a computational approach. With up to 99% yield of 4d, this one-pot synthetic approach can also be useful for large-scale industrial production. One of the separated isomers (4R)-(+)-4S developed as a single crystal, and it was found that this crystal structure was orthorhombic.
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Affiliation(s)
- Mehul P Parmar
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Disha P Vala
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Savan S Bhalodiya
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Dipti B Upadhyay
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Chirag D Patel
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Subham G Patel
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
| | - Srinivasa R Gandholi
- YMC Application Lab Plot No. 78/A/6, Phase VI, Industrial Park Jeedimetla, Gajularamaram Village, Quthbullapur, Medchal Hyderabad-500055 Telangana India
| | - Althaf H Shaik
- YMC Application Lab Plot No. 78/A/6, Phase VI, Industrial Park Jeedimetla, Gajularamaram Village, Quthbullapur, Medchal Hyderabad-500055 Telangana India
| | - Amy Dunne Miller
- Department of Cellular and Systems Medicine, School of Medicine, University of Dundee Dundee UK
| | - Joaquina Nogales
- Department of Cellular and Systems Medicine, School of Medicine, University of Dundee Dundee UK
| | - Sourav Banerjee
- Department of Cellular and Systems Medicine, School of Medicine, University of Dundee Dundee UK
| | - José M Padrón
- BioLab, Instituto Universitario de Bio-Orgánica Antonio González, Universidad de La Laguna Avda. Astrofísico Francisco Sánchez 2 38206 La Laguna Spain
| | - Nasser Amri
- Department of Chemistry, College of Science, Jazan University P.O. Box 2097 Jazan 45142 Saudi Arabia
| | - Nagesh Kumar Kandukuri
- YMC Application Lab Plot No. 78/A/6, Phase VI, Industrial Park Jeedimetla, Gajularamaram Village, Quthbullapur, Medchal Hyderabad-500055 Telangana India
| | - Hitendra M Patel
- P. G. Department of Chemistry, Sardar Patel University Near University Circle, Vallabh Vidyanagar 388120 Gujarat India
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