Abstract
For the first time, we have developed a strategy that provides an access to imidazo[ 1,2-a] pyridines via the cyclization of 2-aminopyridine with mucobromic acid as C3 synthon. In the combination with theoretical calculation, the reaction mechanism is proposed.
Background: 2-Aminopyridines are the typical pyridine α-site derivatives, which have received growing interest in using as a kind of synthons in organic synthesis and drug synthesis because of their special binucleophilic framework.
Methods: All these obtained compounds were characterized by NMR. Among them, 3a was characterized by single-crystal X-ray analysis. All the theoretical calculation works were performed by Gaussian software.
Results: A series of the desired compounds can be synthesized at room temperature via a mild procedure under the promotion of simple inorganic base K2CO3.
Conclusion: This mild strategy fits the concept of green chemistry, providing a novel idea for the construction of nitrogen-containing polyheterocyclic compounds.
Graphical Abstract
[http://dx.doi.org/10.1002/pat.4554]
[http://dx.doi.org/10.1016/j.ejps.2019.105058] [PMID: 31472255]
[http://dx.doi.org/10.1021/acs.jmedchem.6b01566] [PMID: 28002667]
[http://dx.doi.org/10.1016/j.ejmech.2018.03.021] [PMID: 29571156]
[http://dx.doi.org/10.1002/anie.201608526] [PMID: 27735107]
[http://dx.doi.org/10.3390/molecules25122926] [PMID: 32630496]
[http://dx.doi.org/10.1021/acsomega.7b00196] [PMID: 31457821]
[http://dx.doi.org/10.1021/jacs.9b08885] [PMID: 31747753]
[http://dx.doi.org/10.1039/D1QO01753E]
[http://dx.doi.org/10.1021/jacs.0c11043] [PMID: 33356181]
[http://dx.doi.org/10.1002/anie.202009078] [PMID: 32929858]
[http://dx.doi.org/10.1021/acs.jmedchem.0c02232] [PMID: 33872011]
[http://dx.doi.org/10.6023/cjoc202104011]
[http://dx.doi.org/10.1021/acsami.0c07612] [PMID: 32508095]
[http://dx.doi.org/10.1038/s41467-020-15663-5] [PMID: 32286312]
[http://dx.doi.org/10.1038/s41586-020-2250-8] [PMID: 32499642]
[http://dx.doi.org/10.1039/D0SC00392A] [PMID: 34123000]
[http://dx.doi.org/10.1021/jacs.1c03760] [PMID: 34075740]
[http://dx.doi.org/10.1002/anie.202001510] [PMID: 32203637]
[http://dx.doi.org/10.1021/acs.jafc.0c00724] [PMID: 32530620]
[http://dx.doi.org/10.1016/j.ejmech.2020.112558] [PMID: 32652409]
[http://dx.doi.org/10.1016/j.ejmech.2021.113258] [PMID: 33813152]
[http://dx.doi.org/10.1002/anie.202011253] [PMID: 33048416]
[http://dx.doi.org/10.1021/acs.joc.1c01877] [PMID: 34933559]
[http://dx.doi.org/10.1016/j.tetlet.2019.151244]
[http://dx.doi.org/10.1002/adsc.201400605]
[http://dx.doi.org/10.1021/acs.orglett.7b02015] [PMID: 28849656]
[http://dx.doi.org/10.1002/ajoc.201800517]
[http://dx.doi.org/10.1016/j.ejmech.2017.08.005] [PMID: 28800460]
[http://dx.doi.org/10.1039/C9RA03403J] [PMID: 35514736]
[http://dx.doi.org/10.1002/ejoc.201403404]
[http://dx.doi.org/10.1002/ejoc.201900749]
[http://dx.doi.org/10.1021/acssuschemeng.7b04564]
[http://dx.doi.org/10.1002/adsc.201700600]
[http://dx.doi.org/10.1039/C9GC01740B]
[http://dx.doi.org/10.1016/j.bioorg.2020.104518] [PMID: 33303210]
[http://dx.doi.org/10.1039/C9OB00736A] [PMID: 31073571]
[http://dx.doi.org/10.1111/cbdd.13183] [PMID: 29469985]
[http://dx.doi.org/10.1039/C9QO00389D]
[http://dx.doi.org/10.1002/slct.201601294]
[http://dx.doi.org/10.1016/j.tet.2022.132715]
[http://dx.doi.org/10.1016/j.molliq.2021.117980]
[http://dx.doi.org/10.3866/PKU.WHXB2012281]
[http://dx.doi.org/10.1016/j.molliq.2022.119166]
[http://dx.doi.org/10.1021/acs.joc.1c01789] [PMID: 34529434]
[http://dx.doi.org/10.1016/j.apcata.2021.118306]