Abstract
Aims: The aim of this study is to investigate the p-toluene sulphonic acid (p-Ts.OH)- catalyzed reaction of racemic-azetidine-2,3-diones with enantiomerically pure cis and trans-4- hydroxy-L-proline in refluxing ethanol culminating in a synthesis of substituted novel 3-(pyrrol-1- yl)-azetidin-2-ones at the C-3 position.
Methods: This work describes an alternative synthetic route enabling the tandem transformation of proline to pyrrole, followed by intramolecular chirality transfer to the β -lactams ring.
Results: All four diastereomers of 3-(pyrrol-1-yl)-azetidin-2-ones could be achieved in good to excellent yield with high diastereoselectivity in a single-pot operation.
Conclusion: This method can be applied to other activated carbonyl compounds and functionalized pyrroles can be obtained through an expeditious process.
Keywords: -lactam, L-proline, Staudinger reaction, Pyrrole, Anti-cancer
Graphical Abstract
[http://dx.doi.org/10.1056/NEJM198802183180706] [PMID: 3277053]
[http://dx.doi.org/10.1021/ar00100a005]
[http://dx.doi.org/10.3390/antibiotics10080995] [PMID: 34439045]
[http://dx.doi.org/10.1093/jac/41.6.589] [PMID: 9687097]
[http://dx.doi.org/10.1016/0002-9343(85)90254-2] [PMID: 3895915]
[http://dx.doi.org/10.2174/138955708784223558] [PMID: 18473935]
[http://dx.doi.org/10.1021/jm0255825] [PMID: 12502355]
[http://dx.doi.org/10.1124/mol.61.6.1348] [PMID: 12021396]
[http://dx.doi.org/10.1126/science.1109027]
[http://dx.doi.org/10.1016/S0960-894X(01)81083-0]
[http://dx.doi.org/10.1016/S0169-409X(96)00450-4]
[http://dx.doi.org/10.1111/j.1469-0691.2005.01297.x] [PMID: 16451406]
[http://dx.doi.org/10.1016/j.canlet.2008.03.047] [PMID: 18468785]
[http://dx.doi.org/10.3390/cancers4041318] [PMID: 24213508]
[http://dx.doi.org/10.1021/ar00057a004]
[http://dx.doi.org/10.1021/jo00054a007]
[http://dx.doi.org/10.3892/ijmm.21.6.689] [PMID: 18506361]
[http://dx.doi.org/10.1093/jac/44.6.729] [PMID: 10590272]
[http://dx.doi.org/10.2174/09298673113206660268] [PMID: 24059230]
[http://dx.doi.org/10.1021/jo990964c] [PMID: 10813893]
[http://dx.doi.org/10.1016/j.tet.2008.11.042]
[http://dx.doi.org/10.1002/anie.201407686] [PMID: 25284461]
[http://dx.doi.org/10.1016/S0040-4039(00)97083-7]
[http://dx.doi.org/10.1002/med.21443] [PMID: 28815732]
[http://dx.doi.org/10.1002/open.201700051] [PMID: 28638759]
[http://dx.doi.org/10.1128/CMR.00037-09] [PMID: 20065329]
[http://dx.doi.org/10.3892/mmr_000000257] [PMID: 21472239]
[http://dx.doi.org/10.1016/j.bmc.2004.03.033] [PMID: 15110834]
[http://dx.doi.org/10.3389/fchem.2014.00055] [PMID: 25136549]
[http://dx.doi.org/10.3892/mmr_000000259] [PMID: 21472241]
[http://dx.doi.org/10.1016/S0968-0896(00)00297-2] [PMID: 11310593]
[http://dx.doi.org/10.3390/molecules171011570] [PMID: 23023683]
[http://dx.doi.org/10.1515/HC.2009.15.5.323]
[http://dx.doi.org/10.1021/acsomega.8b01969] [PMID: 30556000]
[http://dx.doi.org/10.1002/chem.201703852] [PMID: 29024090]
[http://dx.doi.org/10.1002/hlca.201100202]