Indian Journal of Chemistry

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Sect. B: Organic Chemistry including Medicinal Chemistry

VOL. 50B

NUMBER 11

November 2011

CONTENTS

Papers

 

 

 

1611

Synthesis of 1-(2,4-dinitrophenyl)-3-aryl-4-(arylsul­fanyl)-1H-pyrazoles by Vilsmeier reaction of 2,4-dinitrophenylhydrazones of phenacyl aryl sulfides

 

Synthesis of a set of 1-(2,4-dinitrophenyl)-3-aryl-4-(arylsulfanyl)-1H-pyrazole by the Vilsmeier reaction of 2,4-dinitro­phenyl­hydra­zones prepared from differently substituted phenacyl aryl sulfides is described.

 

 

 

 

Ramaiyan Manikannan, Ramaiyan Venkatesan & Shanmugam Muthusubramanian*

 

Department of Organic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India

 

 

 

 

 

 

 

1619

Synthesis and cytotoxity of novel benzopyran derivatives

 

 

 

 

 

Anil K Tripathi*, Debaraj Mukherjee, Surrinder Koul, Subhash C Taneja, Satyam K Agrawal,

Parduman R Sharma & Ajit K Saxena

 

Bio-Organic Chemistry Section, Indian Institute of Integrative Medicines (CSIR),
Canal Road, Jammu 180 001, India

 

 

 

 

 

 

 

 

 

 

 

 

 

1630

Ecofriendly and sustainable efficient synthesis of bis(indolyl)methanes based on recyclable Brĝnsted (CSA) or Lewis (ZrOCl2.8H2O) acid catalysts

 

Efficient one-pot synthesis of bis(indolyl)methanes catalyzed by CSA or ZrOCl2.8H2O has been described.

 

 

 

Sarita Mishra & Rina Ghosh*

 

Department of Chemistry, Jadavpur University, Kolkata 700 032, India

 

 

 

 

 

 

 

1637

Changeover from (3,4) ene cyclization to (3,5) mode under the influence of Lewis acid catalyst: A quantum mechanical study

 

A comparison between the B3LYP/6-31G* optimized transition structures (TSs) of the Lewis acid catalyzed (3,4) and (3,5) ene cyclization are reported.

 

 

 

 

 

Sukhendu Roy, Kuheli Chakrabarty, Sampad Narayan Gupta & Gourab Kanti Das*

 

Department of Chemistry, Visva-Bharati, Santiniketan 731 235, India

 

 

 

 

 

 

 

1645

Synthesis and antimicrobial studies of Schiff bases of fluoroquinolone

 

Schiff base of fluoroquinolones synthesized and evaluated for antimicrobial activity against five microbes. Majority of them demonstrated good to moderate activity.

 

 

                              

 

R1 = substituted piperazines, morpholine, imidazole

 

 

Navin B Patel*, Sarvil D Patel, Arvind L Patel, Jaymin C Patel & Jignesh N Patel

 

Department of Chemistry, Veer Narmad South Gujarat University, Surat 395 007, India

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes

 

 

 

 

 

 

1658

Synthesis of thiazolyl benzimidazoles and thiazolyl coumarins linked to isoxazole as possible biodynamic agents

 

A new series of linked heterocyclics, 5-(1H-benzo[d]imidazol-2-yl-methyl)-3-(3-methyl-5-[(E)-2-phenyl-1-ethenyl]-4-isoxazolyl)-2-aryl-1,3-thiazolan-4-ones 4 and 3-{3-methyl-5-[(E)-2-phenyl-1-ethenyl]-4-isoxazolyl}-5-(2-oxo-2H-3-chromenyl)-2-aryl-1,3-thiazolan-4-ones 5 have been synthesized by the cyclocondensation of 4-benzal­amino-3-methyl-5-styrylisoxazole 2 with mercapto succinic acid followed by cyclization with 1,2-phenylenediamines or salicyl­aldehydes. Structures of all the newly synthesized compounds 3-5 have been confirmed by spectral and micro analytical data.

 

 

 

 

 

 

E Rajanarendar*, K Rama Murthy, M Nagi Reddy &  Firoz Pasha Shaik

 

Department of Chemistry, Kakatiya University, Warangal 506 009, India

 

 

 

 

 

 

 

1667

FeCl3 catalyzed synthesis of β-keto enol ethers under solvent-free microwave irradiation condition

 

β-Keto enol ethers have been synthesized in very good  yield under solvent-free microwave irradiation condition  from alcohols and
β-diketones in presence of ferric  chloride as a catalyst.

 

 

 

 

 

B P Venkat Lingaiah, T Yakaiah, A Chandra Shekhar, A Ravi Kumar, G Sathaiah, G Venkat Reddy,

B Narsaiah & P Shanthan Rao*

 

Fluoroorganics Division, Indian Institute of Chemical Technology, Hyderabad 500 607, India

 

 

 

 

 

 

 

 

 

 

 

 

 

1671

A convenient synthesis of ethyl

furo[2,3-h]flavone/chromone-8-carboxylates

 

 

 

 

 

 

S Satyanarayana Reddy, M Venkati, Y Jayaprakash Rao, Kamalesh K Sharma & G L D Krupadanam*

 

Department of Chemistry, Osmania University, Hyderabad 500 007, India

 

 

 

 

 

 

 

1677

A new modified synthetic method for preparation of N, N-dichlorocarbamates

 

A rapid, efficient, economic and easy to scale method for the effective conversion of carbamates to corresponding N,N-dichloro­carbamates by using calcium hypochlorite in acidic medium has been described. The transformation has been carried out at room temperature with high yield and purity with reduced reaction time.

 

 

 

 

Pranav K Gutch*, Ravindra Singh & M V S Suryanarayana

 

Synthetic Chemistry Division, Defence R & D Establishment, Jhansi Road, Gwalior 474 002, India

 

 

 

 

 

Authors for correspondence are indicated by (*)