Synthesis 2020; 52(18): 2667-2678
DOI: 10.1055/s-0040-1707393
paper
© Georg Thieme Verlag Stuttgart · New York

Divergent Synthesis of Five-Membered Nitrogen Heterocycles via Cascade Reactions of 4-Arylfuroxans

Daniil A. Chaplygin
a   N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Leninsky prosp., 47, Moscow, Russian Federation   eMail: fershtat@bk.ru
,
Ivan V. Ananyev
b   A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119991, Vavilova str., 28, Moscow, Russian Federation
c   National Research University Higher School of Economics, 101000, Moscow, Russian Federation
,
a   N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Leninsky prosp., 47, Moscow, Russian Federation   eMail: fershtat@bk.ru
,
Nina N. Makhova
a   N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Leninsky prosp., 47, Moscow, Russian Federation   eMail: fershtat@bk.ru
› Institutsangaben
This work was supported by the Russian Foundation for Basic Research (grant 18-03-00332). The structure analysis and DFT calculations were supported by the Russian Science Foundation (project 18-73-10131).
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Publikationsverlauf

Received: 17. März 2020

Accepted after revision: 07. April 2020

Publikationsdatum:
05. Mai 2020 (online)


Abstract

A novel method for the synthesis of a diverse series of functionally substituted five-membered heterocyclic compounds via atom-economic, regio-, and diastereoselective one-pot reaction cascade was developed. This approach involves a ring opening in 4-arylfuroxans to α-oximinoarylacetonitrile oxides followed by [3+2] cycloaddition to various dipolarophiles to afford multisubstituted isoxazoles and isoxazolines. Subsequent azole–azole rearrangement of (oximino)isoxazolines/-isoxazoles, which can be conducted in a one-pot manner, results into functionally substituted furazans formation. The developed protocol is operationally simple, proceeds in mild conditions and with high yields of target heterocyclic systems. Overall, this study represents a new mode of isoxazole and 1,2,5-oxadiazole functionalization strategy, which is useful in medicinal and materials chemistry.

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