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Sinev MY, Shapovalova OV. Physical State and Prospects of Practical Utilization of Water Fluids in Different Regions of Parameters. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793121070137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pavlova LV, Platonov IA, Novikova EA. The Formation of Dispersed Systems from Aqueous Extracts from Milk Thistle Fruits. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2022. [DOI: 10.1134/s1990793121070113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Jawale DV, Wagare D, Lingampalle DL, Netankar PD. Synthesis of 3-methyl-4H-benzo[b][1,4]thiazine-2-carboxylates using CAN as a catalyst and its conversion into guanidines. CURRENT ORGANOCATALYSIS 2020. [DOI: 10.2174/2213337207999201228141906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
1,4-benzothiazine carboxylates show wide application in the field of medicinal chemistry. Therefore, we have designed convenient and efficient method for the synthesis of 1,4-benzothiazine carboxylates.
Objective:
Synthesis of 1,4-benzothiazine carboxylates and its guanidines by simple and facile method using efficient catalyst.
Method:
Derivatives of 1,4-benzothiazine carboxylates were synthesized by cyclocondensing β-keto esters with 2-
aminobenzenethiols using CAN as a catalyst at room temperature. 1,4-benzothiazine caboxylate,condensed with guanidine hydrochloride in the presence of sodium methoxide in DMF to obtained new 3-substituted-l-4Hbenzo[b][1,4]thiazine-2-carboxyguanidines (88-91%).
Results:
All the products were obtained with good to excellent yields within 40 min. Here, CAN oxidizes aminothiophenol into disulfide and then nucleophilic attack of enolic form of β-ketoesters on the disulphide and 1, 4-benzothiazine acetates, were obtained with good yields.
Conclusion:
We have designed convenient and efficient method for the synthesis of 1,4-benzothiazine carboxylates. Most
remarkable features of this cyclocondensation such as use of efficient catalyst and non-volatile solvent under mild reaction
condition to obtained excellent yield.
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Affiliation(s)
- Dhanaji V. Jawale
- Department of Chemistry, R.D. and S.H. college and S.W.A. science college, Bandra West, Mumbai-400050, Maharashtra, India
| | - Devendra Wagare
- Department of Chemistry, Vivekanand college, Aurangabad-431001, India
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