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Chandrani Guin

Indian Association for the Cultivation of Science

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Tetrahedron Letters | 2003

One-pot synthesis of dihydropyrimidinones catalysed by lithium bromide: an improved procedure for the Biginelli reaction

Gourhari Maiti; Pradip Kundu; Chandrani Guin

LiBr catalyses efficiently the three component condensation reaction of an aldehyde, a β-ketoester and urea in refluxing acetonitrile to afford the corresponding dihydropyrimidinones in high yield.

Tetrahedron Letters | 2001

An efficient chemo and regioselective oxidative nuclear bromination of activated aromatic compounds using lithium bromide and ceric ammonium nitrate

Subhas Chandra Roy; Chandrani Guin; Kalyan Kumar Rana; Gourhari Maiti

Abstract A mild, efficient and highly chemo- and regioselective method for the bromination of electron rich aromatic molecules has been developed by electrophilic substitution of Br + , which was generated in situ from LiBr using ceric ammonium nitrate as the oxidant. Free aromatic amines remained unaffected under the reaction conditions.

Tetrahedron | 2002

Stereoselective synthesis of trisubstituted tetrahydrofurans by radical cyclisation reaction using a hypophosphite salt. Application to the total synthesis of (±)-dihydrosesamin

Subhas Chandra Roy; Chandrani Guin; Kalyan Kumar Rana; Gourhari Maiti

The stereoselective synthesis of tetrahydrofurans has been achieved from bromoalkynes and bromoalkenes by intramolecular radical cyclisation using a hypophosphite salt. This radical cyclisation strategy has successfully been applied to the total synthesis of a naturally occurring bioactive furanolignan, dihydrosesamin.

Tetrahedron Letters | 2001

A mild and efficient method for oxidative halodecarboxylation of α,β-unsaturated aromatic acids using lithium bromide/chloride and ceric ammonium nitrate

Subhas Chandra Roy; Chandrani Guin; Gourhari Maiti

Abstract A mild and efficient ecofriendly method for the halodecarboxylation of α,β-unsaturated aromatic acids has been developed by using lithium bromide/chloride and ceric ammonium nitrate in acetonitrile–water at room temperature to afford the vinyl halides in moderate to good yields.

Tetrahedron Letters | 2000

A short and stereoselective total synthesis of (±)-sesamin by radical cyclisation of an epoxide using a transition-metal radical source

Kalyan Kumar Rana; Chandrani Guin; Subhas Chandra Roy

Abstract A short, efficient and stereoselective synthesis of a furofuran lignan, (±)-sesamin, has been achieved in good overall yield through the radical cyclisation of an epoxide using a Ti(III) reagent as the radical initiator.

Tetrahedron Letters | 2005

Titanocene(III) mediated radical cyclization of α-bromo carbonyl compounds: synthesis of tri-substituted tetrahydrofurans

Samaresh Jana; Chandrani Guin; Subhas Chandra Roy

Tetrahedron Letters | 2003

A mild and efficient method for the protection of carbonyl compounds as oxathiolanes, dithiolanes and dithianes catalyzed by molybdenyl acetylacetonate

Kalyan Kumar Rana; Chandrani Guin; Samaresh Jana; Subhas Chandra Roy

Tetrahedron Letters | 2004

Mild and efficient allylation of aldehydes mediated by titanium(III) chloride

Samaresh Jana; Chandrani Guin; Subhas Chandra Roy

Journal of Organic Chemistry | 2005

Radical promoted Wagner-Meerwein-type rearrangement of epoxides in camphoric systems using a Ti(III) radical source.

Samaresh Jana; Chandrani Guin; Subhas Chandra Roy

Arkivoc | 2004

Ceric ammonium nitrate catalyzed mild and efficient α-chlorination of ketones by acetyl chloride

Subhas Chandra Roy; Kalyan Kumar Rana; Chandrani Guin; Biplab Banerjee

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