Synlett 2023; 34(14): 1732-1738
DOI: 10.1055/a-2014-2813
letter

An Efficient Route to Access Spirooxindole–Pyrazolone-Fused Cyclopentenes by a Diastereoselective [3+2] Annulation

Abhijeet S. Sabale
,
,
Ramakrishna G. Bhat

R.G.B. thanks DST-SERB (CRG/2019/005753), Government of India, for the generous research grant. The authors also thank IISER Pune for the financial assistance. A.S.S. and P.K.W. thank UGC New Delhi, Government of India, for providing fellowships.


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Abstract

A DMAP-catalyzed, highly diastereoselective, [3+2] cycloaddition of pyrazolone-derived Morita–Baylis–Hillman carbonates to 3-methyleneoxindoles has been developed. A variety of structurally diverse and complex spiropyrazolone-fused oxindoles bearing three contiguous chiral centers have been synthesized in high yields (up to 98%) and with excellent diastereoselectivities (up to 99:1). Moreover, the synthetic potential of this protocol has been demonstrated by performing a Suzuki coupling reaction.

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Publikationsverlauf

Eingereicht: 05. November 2022

Angenommen nach Revision: 16. Januar 2023

Accepted Manuscript online:
16. Januar 2023

Artikel online veröffentlicht:
11. Mai 2023

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