- A new route to pyranocoumarins and their benzannulated derivatives
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A new protocol based on sequential applications of three atom-economic processes viz. Claisen rearrangement, olefin isomerisation, and ring-closing diene metathesis has been developed to access a range of linear and angularly fused pyranocoumarin derivatives. Incorporation of enyne (in place of diene) metathesis and Diels-Alder reaction in the sequence has allowed the corresponding benzannulated derivatives to be prepared in good yields.
- Chattopadhyay, Shital K.,Mondal, Poulomi,Ghosh, Debalina
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p. 3331 - 3340
(2015/02/18)
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- Sequential Claisen rearrangement and intramolecular Heck reaction as a route to medium-ring oxacycle-fused heterocycles
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A synthetic strategy based on tandem application of Claisen rearrangement and intramolecular Heck reaction as key steps has been developed for the synthesis of various hitherto unknown benzoxocine- and benzoxonine-fused coumarin and quinolone derivatives.
- Chattopadhyay, Shital K.,Neogi, Kaushik,Singha, Sovan K.,Dey, Rajat
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scheme or table
p. 1137 - 1140
(2009/04/05)
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- Synthesis of polycyclic coumarin derivatives by combined Claisen rearrangement, ring-closing metathesis, and Diels-Alder reaction
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A new route to several hitherto unknown linearly and angularly architectured polycyclic coumarin derivatives has been developed involving tandem applications of three atom economic processes viz. Claisen rearrangement, ring-closing enyne metathesis, and D
- Chattopadhyay, Shital K.,Biswas, Titas,Neogi, Kaushik
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p. 376 - 377
(2007/10/03)
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- DDQ Oxidation of 6- or 8-Allyl-7-hydroxycoumarins. A New Synthesis of Benzodipyrandiones and Furobenzopyranones
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A novel synthesis of 2H,8H-benzodipyran-2,8-diones, 2H,8H-benzodipyran-2,8-diones, 2H-furobenzopyran-2-ones, and 7H-furobenzopyran-7-ones was achieved by developing 2-pyrone and furan ring over coumarin. 6- or 8-Allyl-7-hydroxycoumarins on oxidation with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) afforded benzodipyrandiones and furobenzopyranones.The structures of the compounds now synthesized were established by analytical, spectral, and comparison with authentic samples prepared by the known procedures.
- Prashant, Avula,Krupadanam, Gazula Levi David,Srimannarayana, Gutely
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p. 1191 - 1193
(2007/10/02)
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