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Access to highly enantioselective and diastereoselective spirooxindole dihydrofuran fused pyrazolones

WARGHUDE, PRAKASH K.; SABALE, ABHIJEET S.; BHAT, RAMAKRISHNA G. (Royal Society of Chemistry, 2020-03)

A tertiary amine catalyzed highly diastereoselective and enantioselective [3 + 2] annulation between Morita–Baylis–Hillman (MBH) carbonates derived from isatin and pyrazolone 4,5-diones has been developed. A series of ...
An easy and practical approach to access multifunctional cylcopentadiene- and cyclopentene-spirooxindoles via [3 + 2] annulation

WARGHUDE, PRAKASH K.; SABALE, ABHIJEET S.; Dixit, Ruchi; Vanka, Kumar; BHAT, RAMAKRISHNA G. (Royal Society of Chemistry, 2021-05)

A highly regioselective [3 + 2] annulation of Morita–Baylis–Hillman (MBH) carbonates of isatin with aurone/thioaurone is developed. Spiroheterocycles such as spirooxindole cyclopentadiene and spirooxindole fused hydroxy ...
An Efficient Route to Access Spirooxindole–Pyrazolone-Fused Cyclopentenes by a Diastereoselective [3+2] Annulation

SABALE, ABHIJEET S.; WARGHUDE, PRAKASH K.; BHAT, RAMAKRISHNA G. (Thieme, 2023-09)

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 spiropyraz ...
The Reactivity of Acceptor-Acceptor Diazo Pyrazolones with Allyl Thioethers under Visible Light: Access to Homoallyl Sulfides, Spiropyrazolones - Pesticide Analogues and Photoflow Synthesis

BANKAR, ONKAR S.; PAL, CHHABI; LAHA, DEBASISH; SABALE, ABHIJEET S.; BHAT, RAMAKRISHNA G. (American Chemical Society, 2024-11)

The novel reactivity of a less selective and more reactive acceptor-acceptor kind of diazo pyrazolone (DIPOL) has been explored under visible light for the first time. We have successfully demonstrated the reaction of DIPOL ...
Direct Access to 3,4-Fused Spirooxindoles Through Visible-Light-Driven Diasterioselective [4+2] Cyclization of 3-Methylene Oxindoles

SABALE, ABHIJEET S.; BHOWMICK, ANINDITA; PATTANAIK, SASWATA; BANKAR, ONKAR S.; BHAT, RAMAKRISHNA G. (Wiley, 2025-04)

A visible light-mediated strategy has been developed to synthesize diastereoselective 3,4-fused spirooxindoles via formal [4+2] cycloaddition of 3-methylene oxindoles without the need of pre-functionalization. The 3-methylene ...

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