Indian Journal of Chemistry

Sect. B: Organic Chemistry including Medicinal Chemistry

VOL. 40B

NUMBER 4

APRIL 2001

CONTENTS

Papers

 

 

 

 
269

Synthesis of 3-aryl-5N-aryl-4,6-dioxopyrrolo­[3,4-d]-7,8-dihydroisoxazolines via 1,3-dipolar cycloaddition reaction

 

 

 

 

 

 

 

 

 

 

 

 

 

A series of cycloadducts 3a-m via 1,3-dipolar cycloaddition of in situ generated nitrile oxide with N-substituted maleimides 2a-d has been described.

 

 

 

 

 

 

 

 

 

 

K Ajay Kumar, K M Lokanatha Rai*,

K B Umesha & K Rajasekhara Prasad

 

 

 

 

 

 

 

 
274

Preparation of ethyl 6-methoxy-7-methyl-1-aryl/cyclohexyl-4-oxo-2-naphthoates as an intermediates for synthesis of b-apopicropodo-phyllin analogues

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Preparation of tetralone ester 4a-c, an intermediate for the synthesis of b-apopicropodophyllin analogues via Stobbe condensation of benzophenone derivatives followed by Friedal Craft’s cyclization is described.

 

 

 

 

 

 

 

 

N Nanjundaswamy, K M Lokanatha Rai*,

C Anjanamurthy & S Shashikanth

 

 

 

 

 

 

 

 
278

Synthesis of hormothamnione and 6-des­me-
th­oxyhormothamnione

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The antineoplastic styrylchromones hormothamnione 1 and 6-desmethoxyhormothamnione 2 are readily prepared by selective and simultaneous demethylation and debenzylation of chromones 3 and 4 using excess AlCl3-NaI in CH3CN.

 

 

 

 

 

 

 

 

 

 

 

Niveta Jain, Geetu Gambhir &

H G Krishnamurty*

 

 

 

 

 

 

 

 
284

A facile synthesis of pyrimido­[2¢¢,3¢¢:5¢,1¢]
pyrazolo [3
¢,4¢:4,5]pyrimido­[1,6-a]­­­benzi­mid­a­zoles and [1,2,4]triazino­[3¢¢,4¢¢:5¢,1¢]­­pyrimido­[6,1-a]­benz­imidazoles

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Thieno[2¢,3¢:4,5]pyrimido[1,6-a]benzimidazoles, pyrimido[2¢¢,3¢¢: 4¢,1¢]pyrazolo[3¢,4¢: 4,5]pyrimido[1,6-a]­-
­ben­z­imidazoles and [1,2,4]triazino[3
¢¢,4¢¢:5¢,1¢]pyrazolo­[3¢,4¢:4,5]pyrimido[6,1-a]benzimidazoles have been syn­the­sised in a good yield via reaction of 3-mercapto­pyrimidol[1,6-a]benzimidazoles and some reagents.

 

 

 

 

 

 

 

 

 

 

Abdou O Abdelhamid*, Hussein F Zohdi &
Mahmoud M Ziada

 

 

 

 

290

Photochemical reaction of trihalomethanes with diphenylamine in organic media and its analytical application

 

 

 

 

 

 

 

A rapid spectrofluorimetric method for the parts per million (ppm) level determination of bromoform (CHBr3) has been described. The method is based on the photochemical reaction of CHBr3 with diphenylamine (DPA) in acetonitrile media. The method has been applied for water samples also.

 

 

 

 

Anjali Pal* & Manas Bandyopadhyay

 

 

 

 

 

 

 

295

1-Phenacyl-, 1-carbethoxymethyl- and 1-benzyl-4-dimethylaminopyridinium halides: Isolation and use for generating ylide

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


M Nallu*, V Sathiskumar, M K Sangeetha &

K Sarkunam

 

 

 

 

 

 

 

299

Crystal and molecular structure of the monothioketal of 2,4-diphenyl-3-azabicyclo­[3.3.1]­nonan-9-one

 

 

 

 

 

 

 

 

 

 

 

The equatorial dispositions of the sulphur atom and the phenyl groups in the piperidine ring are confirmed by single crystal X-ray diffraction analysis for the molecule shown below. The presence of the five membered 1,3-oxathiolane ring in the envelope conformation and the flattening of the piperidine ring in the molecule are also established.

 

 

P Laavanya, K Panchanatheswaran*,

M Sujatha, R Jeyaraman*, N K Lokanath &

J Shashidhara Prasad

 

 

 

 

 

 

 

303

Novel bridgehead nitrogen heterocyclic systems: Synthesis and antimicrobial activity of imidazo[2,1-b][1, 3, 4]thiadiazolo[2, 3-c]-s-tri­azoles, s-triazolo[3,4-b][1,3,4]thiadiazolo[3,2-b]
imidazo[4,5-b]quinoxaline and bis-([s-tri­azolo­[3, 4-b][1, 3, 4]thiadiazolo[3, 2-b]imidazo[4, 5-b]
cyclohexane]-5a, 6a-diene)

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Synthesis and antimicrobial activity of imidazo[2,1-b]
1, 3, 4-thiadiazolo[2, 3-c]-s-triazoles, s-triazolo[3, 4-b]
[1,3,4]­­­thiadiazolo[3,2-b]imidazo[4,5-b]quinoxaline and bis-([s-triazolo[3, 4-b]thiadiazolo[3, 2-b]imidazo[4, 5-b]-cyclohexane]-5a, 6a-diene).

 

 

 

 

 

 

 

Jag Mohan* & Anupama

 

 

 

307

Thiazolydinyl–triazinoquinazolines as potent anti-inflammatory agents

 

 

 

 

 

 

 

 

 
 

 

 

 

 

 


Various substituted quinazolines 8a-e possessing potent anti-inflammatory activity have been synthesized from
3-arylidenehydrazino-4-phenyl-6-methyl-10-bromo[1, 2, 4]
triazino[2,3-c]quinazolines 7a-e. Compound 3 (5
¢-p-N, N-dimethylphenyl-2¢-oxo-4¢-thiazolidin-1¢-yl) amino-4-phenyl­-6-methyl-10-bromo[1,2,4]triazino[2,3-c]quin­azo­line has been found to be the most active.

 

 

 

 

 

 

 

 

 

Ekta Bansal, Tilak Ram, Shalabh Sharma,

 Mirdula Tyagi, Archana Preeti Rani,

Ritu Tyagi,  Bhawna Goel, V K Srivastava,

J N Guru & Ashok Kumar*

 

 

 

 

 

 

 

 

 

313


Justicia lignans: Part 7 — Two new diphyllin glycosides from Justicia neesii Ramamoorthy

 

 

 

 

 

 

 


Two new diphyllin glycosides, nessiinosides A(1) and B(2) have been isolated from Justicia neesii.

 

Gottumukkala V Subbaraju*,

Dodda Rajasekhar, Jakka Kavitha &

Jorge I Jimenez

 

 

 

 

 

 

 

 

 

1 & 2: R1=H, R2=Me, R3=

1a & 2a: R1=R2=R3=H

1b & 2b: R1=H, R2=Me, R3=H

1c & 2c: R1=Ac, R2=Me, R3=Ac

 

Compd 1 = 1b, 2a, 3b, 19a-tetrahydroxy urs-12-ene-28-
oate-3-O-
b-D

Compd 2 = 1b, 2b, 3b, 19a-tetrahydroxy urs-12-ene-28-
oate-3-O-
b-D

 

 

 
320

Two new triterpenoid glycosides from

Centipeda minima

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Two new triterpenoid glycosides have been isolated from the ethanol extract of the whole plant of Centipeda minima. Structures of the compounds have been elucidated by mass spectra, 1H and 13C NMR spectra.

 

 

 

Nirupama Rai & J Singh*

 

Notes

324

Synthesis of aurentiacin

 

 

Aurentiacin 7 isolated from pityrogramma has been synthesized from phloroacetophenone.

 

M Amzad Hossain*

 

 

 

 

 

 

 

327

A convenient methodology for demercuration of organomercurials by Na/MeOH—Synthesis of ethers

 

 

A convenient and workable process for the demercuration of methoxy derivatives of organomercurials by Na/MeOH is described. The reaction tolerates another C=C and cyclopropyl ring.

 

 

Navdeep Kaur & Ranjit S Dhillon*

 

 

 

 

 

 

 

329

Oxidation of alcohols by silica gel-supported chlorochromate in solventless system

 

 

A simple and selective method for the oxidation of
alcohols to carbonyl compounds is described. It occurs on silica gel supported ammonium chlorochromate under solvent-free conditions and is expedited by microwave irradiation.

 

M M Heravi, R Kiakojoori & M M Mojtehadi

 

 

 

 

 

 

 

331

Synthesis and biological activity of novel anti-bacterial quinolones

 

 

 
 

 

 

 

 

 

 

 


Novel quinolones, having interesting anti-bacterial acti­vity against both gram-positive and gram-negative bacterial strains, have been prepared, characterised and tested.

 

 

 

 

 

 

 

 

 

M R Sarma, N Vasanth Kumar, A S R Prasad,

S Eswaraiah, C Prabhakar, G Om Reddy*,

M Sitaram Kumar, A K Sadhukhan,

A Venkateswarlu & K Anji Reddy

 

 

 

 

 

 

 

 

 

336

Synthesis and antibacterial activity of some new 1,8-naphthyridinyl-4-thiazolidinones

Formation of 2-aryl-3-(1,8-naphthyridin-2-one-3-carbonyl­-
amino)-4-thiazolidinones 4 have been reported from 1,8-naphthyridin-2-one-3-carboxylic acid hydrazide 2. The compounds have been evaluated for their antibacterial activity.

 

 

K Mogilaiah*, R Babu Rao &

G Rama Sudhakar

 

 

 

 

 

 

 

339

Synthesis of new O, O-dialkyl-O-coumarino-phosphorothioates and their pesticidal bioassay against Helicoverpa armigera

 

 

 

 

 

 
 

 

 

 

 

 

 

 


A series of compounds O, O-dialkyl-O-coumarino­phosphorothioates have been synthesized and screened for pesticidal activities against Helicoverpa armigera. Some of the compounds (3, 4, 6 and 7) show significant activities while the rest of the compounds show moderate activities.

 

 

 

 

 

 

 

 

 

Vishal P Chavan, Avinash S Mane &

Murlidhar S Shingare*

 

 

 

 

 

 

 

 
342

Pharmacological studies of some 2-methyl-
3-(arylthiocarbamido) quinazol-4-ones and
2-methyl-3-(arylidenocarboxamido) quinazol-4-ones

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Several quinazolone derivatives of 2-methyl-8-(arylthiocarbamido)quinazol-4-ones 2 and 2-methyl-3-(aryldenocarboxamido)quinazol-4-ones 3 have been syntheised and studied for their possible antibacterial activity against B. subtilis, B. cereus, S. aureus, S. lutae and antiviral activity against Gomphrena mosaic virus. Some of these compounds show notable activity.

 

 

 

 

 

 

 

 

 

 

Manoj Kr Srivastava, Bharati Mishra &

Nizamuddin*

 

 

 

 

 

 

 

 

 

345

Screening of natural products for new leads as inhibitors of IkBa kinase: 2-Hydroxy-6-substituted benzoic acids from plant extracts

 

2-Hydroxy-6-pentadecylbenzoic acid 1, 2-hydroxy-6-(8,11-pentadecadienyl)benzoic acid 2 and 2-hydroxy-6-(8,11,14-pentadecatrienyl)benzoic acid 3 have been isolated from the plants extracts by bioactive guided purification. All the three compounds show good IkBa kinase inhibitory activity.

 

N V S Ramakrishna*, A K Jain, S Kota,

E K S Vijaya Kumar, S Kalakoti, R D Gupte,

R B Panicker & R V S V Vadlamudi

 

 

 

 

 

 

 

348

Centdaroic acid, a new diterpene acid from Cedrus deodara

A new diterpene acid, centdaroic acid has been isolated from Cedrus deodara and characterized. In addition seven other known compounds are also isolated.

 

Sudhir Srivastava & Dinesh K Kulshreshtha*

 

 

 

 

 

 

 

350

Isolation and characterization of two novel triterpenes from Adiantum venustum

 

 

 

 

The structures of two novel triterpenes, adiantutirucallene B and adiantulanostene, isolated from the aerial parts of Adiantum venustum, have been established as tirucall-8, 22-cyclic-24(25)-ene and 13, 14-seco-8,22-cyclic-lanost-5(6),24(25)-diene, respectively on the basis of spectral analyses and chemical reactions.

 

Neeraj Chopra, M Sarwar Alam*,

Mohammad Ali & Masatake Niwa

 

 

 

 

 

 

 

 

 

354

New constituent from the roots of Terminalia arjuna : Antifungal agent

 

 

 

Evidences are presented for the structure of a new compound, 2a, 19a-dihydroxy-3-oxo-12-oleanen-28-oic acid-28-O-b-d-glycopyranoside 1 which occurs together with known substances b-amyrin and friedelin in the roots of Terminalia arjuna. Biological screening of the compound revealed antifungal activity.

 

B K Chouksey & S K Srivastava*

 

 

 

 

 

 

 

 

Authors for correspondence are indicated by (*)

 

 

 

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