Gold(III) Chloride Catalyzed Synthesis of Chiral Substituted 3- Formyl Furans from Carbohydrates: Application in the Synthesis of 1,5-Dicarbonyl Derivatives and Furo[3,2-c]pyridine
IR@IICB: CSIR-Indian Institute of Chemical Biology, Kolkata
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| Title |
Gold(III) Chloride Catalyzed Synthesis of Chiral Substituted 3- Formyl Furans from Carbohydrates: Application in the Synthesis of 1,5-Dicarbonyl Derivatives and Furo[3,2-c]pyridine
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| Creator |
Mal, Kanchan
Sharma, Abhinandan Das, Indrajit |
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| Subject |
Chemistry
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| Description |
This report describes a gold(III)-catalyzed efficient
general route to densely substituted chiral 3-formyl furans
under extremely mild conditions from suitably protected 5-
(1-alkynyl)-2,3-dihydropyran-4-one using H2O as a nucleophile.The reaction proceeds through the initial formation of an activated alkyne–gold(III) complex intermediate, followed by either a domino nucleophilic attack/anti-endo-dig cyclization, or the formation of a cyclic oxonium ion with subsequent attack by H2O. To confirm the proposed mechanistic pathway, we employed MeOH as a nucleophile instead of H2O to result in a substituted furo[3,2-c]pyran derivative, as anticipated. The similar furo[3,2-c]pyran skeleton with a hybrid carbohydrate–furan derivative has also been achieved through pyridinium dichromate (PDC) oxidation of a substituted chiral 3-formyl furan. The corresponding protected 5-(1-alkynyl)-2,3-dihydropyran-4-one can be synthesized from the monosaccharides (both hexoses and pentose) following oxidation, iodination, and Sonogashira coupling
sequences. Furthermore, to demonstrate the potentiality of
chiral 3-formyl furan derivatives, a TiBr4-catalyzed reaction of these derivatives has been shown to offer efficient access to 1,5-dicarbonyl compounds, which on treatment with NH4OAc in slightly acidic conditions afforded substituted furo[3,2-c]pyridine.
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| Publisher |
Wiley-VCH Verlag GmbH & Co. KGaA Weinheim
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| Date |
2014
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://www.eprints.iicb.res.in/2142/1/CHEMISTRY%2DA_EUROPEAN_JOURNAL__V_20(_37)11932%2D11945_;2014[42].pdf
Mal, Kanchan and Sharma, Abhinandan and Das, Indrajit (2014) Gold(III) Chloride Catalyzed Synthesis of Chiral Substituted 3- Formyl Furans from Carbohydrates: Application in the Synthesis of 1,5-Dicarbonyl Derivatives and Furo[3,2-c]pyridine. Chemistry A European Journal, 20 (37). pp. 11932-11945. |
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| Relation |
http://dx.doi.org/10.1002/chem.201402286.
http://www.eprints.iicb.res.in/2142/ |
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