1
|
K Zaidan R, Evans P. Stereoselective synthesis of analogues of deoxyfebrifugine. JOURNAL OF CHEMICAL RESEARCH 2022. [DOI: 10.1177/17475198211047209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The preparation of six new optically active analogues of the natural product febrifugine (1) is reported. These analogues, lacking the hydroxy group from the natural product, were prepared from optically active N-protected S-pelletierine (7) and differ in terms of the specific quinazolinone portion included. The required S-7 (80% enantiomeric excess) was prepared from an asymmetric Mannich reaction between piperideine (8) and acetone in the presence of l-proline. The differently substituted quinazolinone used in this study (10a–10g) was either commercially available or was prepared from the corresponding substituted anthranilic acid and were installed via a bromination–alkylation sequence. N-Deprotection of the subsequent adducts (12a–12g) gave target compounds 13a–13f and completed the synthetic sequence.
Collapse
Affiliation(s)
- Raed K Zaidan
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Dublin, Ireland
- Department of Chemistry, College of Science, University of Basra, Basra, Iraq
| | - Paul Evans
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Dublin, Ireland
| |
Collapse
|
2
|
Sridhar PR, Anjaneyulu B, Rao BU. Regioselective Anomeric
O
‐Benzyl Deprotection in Carbohydrates. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Perali Ramu Sridhar
- School of Chemistry University of Hyderabad Hyderabad, Gachibowli 500046 India
| | - Bandi Anjaneyulu
- School of Chemistry University of Hyderabad Hyderabad, Gachibowli 500046 India
| | | |
Collapse
|
3
|
Occhiato EG, De Marchi E, Arnodo D, Maffeis E, Scarpi D, Prandi C. Enantiodivergent Synthesis of Halofuginone by Candida antarctica Lipase B (CAL-B)-Catalyzed Kinetic Resolution in Cyclopentyl Methyl Ether (CPME). SYNOPEN 2021. [DOI: 10.1055/a-1523-6428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
AbstractThe synthesis of both enantiomers of a key intermediate in the synthesis of halofuginone was accomplished by a Candida antarctica lipase B (CAL-B)-catalyzed kinetic resolution of the corresponding racemate. When the resolution was carried out in the versatile solvent cyclopentyl methyl ether (CPME) using p-chlorophenylbutyrate (PCPB) as the acylating reagent, the highest enantiomeric ratio (E) values were measured, and highly enantioenriched (95% ee) compounds could be obtained in a single iteration. As an example, one of the two enantiomers was used as a starting material to prepare (+)-halofuginone in a three-step procedure.
Collapse
Affiliation(s)
| | - Elisa De Marchi
- Dipartimento di Chimica ‘Ugo Schiff’, Università degli Studi di Firenze
| | - Davide Arnodo
- Dipartimento di Chimica, Università degli Studi di Torino
| | | | - Dina Scarpi
- Dipartimento di Chimica ‘Ugo Schiff’, Università degli Studi di Firenze
| | | |
Collapse
|