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Chinese Chemical Letters 2006年第9期17卷 1137-1140页

作者： Rahul R.NAGAWADE devanand b.shinde Division of Medicinal Chemistry-New Drug Discovery Wockhardt Research Centre Aurangabad-431210 (M.S.) India Department of Chemical Technology Dr. Babasaheb Ambedkar Marathwada University Aurangabad-431004 (M.S.) India Department of Chemical Technology Dr. Babasaheb Ambedkar Marathwada University Aurangabad-431004 (M.S.) India

The tetrahydroquinoline moiety is a structural feature of many natural products. by using a domino reaction of aromatic amines and cyclic enol ethers catalyzed by zirconyl chloride in water, various tetrahydroquinoline derivatives were synthesized efficiently. Most cyclized products showed cis selectivity. The cis selectivity was tentatively rationalized due to chelation control in water.

关键词： Anilines cyclic enol ether domino reaction tetrahydroquinoline zirconyl chloride

bF_3·OEt_2 Promoted Solvent-free Synthesis of benzimidazole Derivatives

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Chinese Chemical Letters 2006年第4期17卷 453-456页

作者： Rahul R.NAGAWADE devanand b.shinde Division of Medicinal Chemistry-New Drug Discovery Wockhardt Research CentreAurangabad-431210 (M.S.)India Department of Chemical TechnologyDr.Babasaheb Ambedkar Marathwada UniversityAurangabad-431004 (M.S.)India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad-431004 (M.S.)India

Differently substituted benzimidazoles have been synthesized in very good yields in solvent-free conditions from o-phenylenediamine and aldehydes in the presence of bF3·OEt2 as a catalyst. The method is applicable to aromatic, unsaturated and aliphatic aldehydes and to substituted o-phenylenediamines without significant differences.

关键词： bF3·OEt2 aldehydes benzimidazoles solvent-free reactions drugs.

Oxalic acid catalyzed solvent-free one pot synthesis of coumarins

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Chinese Chemical Letters 2007年第11期18卷 1309-1312页

作者： Nagnnath D.Kokare Jaiprkash N.Sangshetti devanand b.shinde Department of Chemical Technology Dr.babasaheb Ambedkar Marathwada University Aurangabad 431004 (MS)India Wockhardt Research CentreNew Drug DiscoveryAurangabad 431210 (MS)India Department of Chemical Technology Dr.babasaheb Ambedkar Marathwada University Aurangabad 431004 (MS)India

Oxalic acid was found to be an efficient catalyst for Pechmann condensation, which includes the reaction between phenols and β-keto esters leading to formation of coumarin derivatives. The advantages of present methods are the use of cheap and easy available catalyst, solvent-free reaction conditions, better yields and shorter reaction time.

关键词： Coumarins Oxalic acid Solvent-free reaction Pechmann condensation β-Keto esters Phenols

Oxalic acid as a catalyst for efficient synthesis of bis-(indolyl)methanes,and 14-aryl-14H-dibenzo[a,j]xanthenes in water

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Chinese Chemical Letters 2008年第10期19卷 1186-1189页

作者： Nagnnath D.Kokare Jaiprakash N.Sangshetti devanand b.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India New Drug DiscoveryWockhardt Research CentreAurangabad 431210(MS)India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India

A simple, efficient, and environment benign route was developed for the preparation of bis-（indolyl）methanes and 14-aryl-14H- dibenzo[aj]xanthenes from condensation of various aromatic aldehydes or ketones with indole, and 2-naphthol, respectively, using oxalic acid catalyst in aqueous medium. Use of cheap and easily available catalyst, better yields and simple reaction protocol are the advantages of the present method.

关键词： Oxalic acid bis-(indolyl)methanes 14-Aryl-14H-dibenzo[a,j]xanthenes Aldehydes

Sulfanilic acid catalyzed solvent-free synthesis of 1,5-benzodiazepine derivatives

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Chinese Chemical Letters 2007年第11期18卷 1305-1308页

作者： Jaiprakash N.Sangshetti Nagnnath D.Kokare devanand b.shinde Department of Chemical Technology.Dr.babasaheb Ambedkar Marathwada University Aurangabad 431004.MS India Department of Chemical Technology Dr.babasaheb Ambedkar Marathwada University Aurangabad 431004MSIndia New Drug DiscoveryWockhardt Research CentreAurangabad 431210MSIndia Department of Chemical Technology Dr.babasaheb Ambedkar Marathwada University Aurangabad 431004MSIndia

Sulfanilic acid has been found to be an efficient catalyst for the synthesis of 1,5-benzodiazepines from o-phenylenediamine and ketones. This method is simple, effective and environmentally friendly and gives better y... 详细信息

关键词： 1,5-benzodiazepines Sulfanilic acid catalyst Solvent free condition

ZrOCl_2·8H_2O catalyzed solvent-free synthesis of isobenzofuran-1(3H)-ones

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Chinese Chemical Letters 2011年第2期22卷 163-166页

作者： Jaiprakash N.Sangshetti Siddique Akber M.K.Ansari devanand b.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004(MS)India

ZrOCl2·8H2O catalyzed environmentally benign synthesis of isobenzofuran-1（3H）-ones are ***2·8H2O appeared to be an excellent catalyst for the condensation and *** of phthalaldehydic acid（2-carboxybenzaldehyde） with methylaryl and cyclic ketones was initiated by condensation and occurred in one step providing excellent yields（90-98%）.

关键词： 2-Carboxybenzaldehyde Methylaryl and cyclic ketones ZrOCl_2·8H_2O catalyst

ZrOCl_2·8H_2O catalyzed one-pot synthesis of 2,4,5-triaryl-1H-imidazoles and substituted 1,4-di(4,5-diphenylimidazolyl)benzene

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Chinese Chemical Letters 2008年第7期19卷 762-766页

作者： Jaiprakash N.Sangshetti Nagnnath D.Kokare Sandeep A.Kotharkar devanand b.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004 (MS)India Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004 (MS)India Wockhardt Research CentreAurangabad 431210 (MS)India

A simple one-pot synthetic method for the preparation of 2,4,5-triaryl-lH-imidazoles from benzoin or benzil, ammonium acetate, aromatic aldehydes, and ZrOCl2-8H2O catalyst is described. The ZrOCl2-8H2O catalyst was found to be equally effective for aromatic and heteroaromatic aldehydes and also for the preparation of substituted 1,4-di（4,5-diphenylimidazol-yl） benzene.

关键词： ZrOCl2·8H2O Triaryl-1H-imidazoles benzoin benzil Ammonium acetate Aromatic aldehydes

Development of mild and efficient method for synthesis of substituted flavones using oxalic acid catalyst

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Chinese Chemical Letters 2009年第2期20卷 171-174页

作者： Abhay S.Zambare Jaiprakash N.Sangshetti Nagnnath D.Kokare devanand b.shinde Department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University New Drug Discovery Wocckhardt Research Centre

Oxalic acid has been used as a catalyst for intramolecular cyclisation of 2-hydroxychalcones to form flavones in good yields. The efficiency of the catalyst was proved with a variety of substrates ranging from electro... 详细信息

关键词： Aromatic aldehydes 2-Hydroxychalcone Oxalic acid Flavones

Sulphamic Acid （H2NSO3H）-Catalyzed Multicomponent Reaction of β-Naphthol： An Expeditious Synthesis of Amidoalkyl Naphthols

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Chinese Journal of Chemistry 2007年第11期25卷 1710-1714页

作者： NAGAWADE, Rahul R. shinde, devanand b. Department of Chemical Technology Dr. Babasaheb Ambedkar Marathwada University Aurangabad 431004 (Maharashtra) India

Sulphamic acid （H2NSO3H） was found to be an efficient catalyst for the multicomponent condensation reaction of β-naphthol, aromatic aldehydes and urea or amides to afford the corresponding α-amidoalkyl-β-naphthols in good yields. The remarkable features of this new procedure are high conversions, short reaction time, clean reaction profiles and simple experimental and work-up procedures.

关键词： sulphamic acid multicomponent reaction condensation β-naphthol aryl aldehyde urea

Pb（NO3）2 Mediated Synthesis of Pyrazine

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Chinese Journal of Chemistry 2007年第1期25卷 105-107页

作者： KOTHARKAR, Sandeep Anilrao shinde, devanand baburao Department of Chemical Technology Dr Babasaheb Ambedkar Marathwada University Aurangabad (M.S.)-431004 India

Lead nitrate was used as an efficient catalyst in the oxidation and condensation reaction of hydroxy ketone with diamine leading to the formation of pyrazine derivatives in excellent yields.

关键词： Pb(NO3)2 pyrazine aromatization