Indian Journal of Chemistry

Sect. B: Organic Chemistry including Medicinal Chemistry

VOL. 41B

NUMBER 6

JUNE 2002

CONTENTS

	Papers
1226		A mechanistically designed cinchona alkaloid ligand in the osmium catalyzed asymmetric dihydroxylation of alkenes	A new ligand has been designed using dihydroquinine as the chiral controller for asymmetric dihydroxylation of alkenes. The purpose of this design of the ligand is to find out the transition state involved in the mechanism of asymmetric dihydroxylation, which may shed some light to differentiate between the hypothesis put forward by Sharpless’ and Corey’s groups. The present study supports the hypothesis proposed by Sharpless et al. and it appears that the L shaped cleft may be involved in governing the high selectivity of asymmetric dihydroxylation of alkenes.
		B B Lohray*, S K Singh & V Bhushan
1234		A convenient synthesis of 3,5-diarylthieto[2,3-d] thiazole-2-thiones, and expansion of their thiete ring with carbon disulphide
		L D S Yadav*, Suman Dubey & Smita Singh
1238		Syntheses, characterisation and fluorescence study of some novel naphthalimide derivatives	Some new fluorescent derivatives viz. 4-tosylamido-1,8-naphthalic anhydride 4, 4-dansylamido-1,8-naph-thalimido-N-pentanol 7 and 4-dabsylamido-1,8-naph-thalimido-N-pentanol 8 have been prepared and characterised. Their comparative fluorescence study and quantum yield has been carried out in various solutions and in the presence of different ions and buffers. These can be used for covalent labelling of different biomolecules.
		Yashveer Singh, Arvind Misra & Krishna Misra*

1246	Covalent labelling at 5¢-end of synthetic oligonucleotides by one step generation of alkylamino group
	Krishna K Dubey, Yashveer Singh, Sanjay Kumar, Ramendra K Singh & Krishna Misra*
1251	An efficient method for selective deprotection of trimethylsilyl ethers, tetrahydropyranyl ethers, ethylene acetals and ketals under solvent-free conditions
	Abdol R Hajipour*, Shadpour E Mallakpour*,I Mohammadpoor-Baltork & S Khoee
1257	Synthesis and antibacterial activity of N-bridged heterocycles derived from aryloxymethyltriazoles	Reactions of aryloxymethyltriazoles have been described. The resulting N-bridged heterocycles have been characterized and their antibacterial activities are studied.
	B Shivarama Holla*, K Shridhara & M K Shivananda

1263	Synthesis of some of the antibacterial compounds from 4-hydroxycoumarins: Part II	Synthetic utility of 1 to synthesize various biologically active heterocycles like 2-6 has been reported.
	V V Mulwad* & J M Shirodkar
1268	QSAR with electrotopological state atom index : Part IV — Receptor binding affinity of proges-tagens Achintya Saha*, Kunal Roy, Kakali De & Chandana Sengupta	QSAR analysis of receptor binding affinity of progestagens with electrotopological state atom index has been performed in an attempt to locate the pharmacophore fragment of the molecules.
1276	Chemical examination of the Echinoderms of the Indian Ocean : The triterpene glycosides of the sea cucumbers : Holothuria nobilis, Bohadschia aff. tenuissina and Actinopyga mauritana from Lakshadweep, Andaman and Nicobar Islands	Three new artificial genins (1, 1a and 2) along with seven known genins (3-9) have been obtained from acid hydrolysis of triterpenoid glycosides of the sea cucumbers.
1  R = OH 2 1a R = H
	Parvataneni Radhika, Vallurupalli Anjaneyulu, Potluri Venkata Subba Rao*, T N Makarieva* & A I Kalinovosky

1283	Pterocarpan, phenol and lipid constituents from Butea monosperma stem	In addition to stigmasterol-3-al-arabinopyranoside, four new compounds isolated from the stems of Butea monosperma have been characterized as 3-methoxy-8, 9-methylenedioxypterocarp-6-ene, 21-methylene-22-hydroxy-24-oxooctacosanoic acid methyl ester, 4-pentacosanylphenol and pentacosanyl-b d-glucopyrano-side by spectral data and chemical studies.
1 4 2
	Y N Shukla^*, Mamta Mishra & Sushil Kumar
Notes
1286	Facile one-pot synthesis of 2-aminothiazoles from 1,3-diazabuta-4-methylthio-1,3-dienes	Convenient synthesis of 2-aminothiazole derivatives from reactions of 1,3-diazabuta-1,3-dienes with thioglycolic acid and ethyl bromoacetate are described.
	Paramita D Dey, Arun K Sharma, Jayakumar S & Mohinder P Mahajan*
1290	Synthesis of new Schiff base p-tert-butyl-calix[4]arene with imine units spanning 1,3-distal positions on the lower rim
	Manoj Kumar*, Vandana Sharma nee¢ Bhalla & Neerja Sharma

1293	Oxidative coupling of thiols to disulfides by piperazinium dichromate	Aliphatic and aromatic thiols can be oxidized to the corresponding disulfides in the presence of piperazinium dichromate under mild condition.
	B Movassagh*, M M Lakouraj* & K Ghodrati
1296	Facile preparation of amides from thioamides by ceric ammonium nitrate	Ceric ammonium nitrate has been used to convert thioamides into amides in aqueous acetic acid under very mild conditions.
	Barahman Movassagh*, Forhatosadat Meibodi & Shahin Sobhani
1299	InCl3 mediated reactions of aldehydes with allyltrimethylsilane	InCl3 mediated coupling reactions of aromatic aldehydes with allyltrimethylsilane readily provide the respective homoallylalcohols and/or the substituted pyran derivatives.
	Rina Ghosh*, Arijit Chakraborty, Debasish De & Swaraj B Maiti
1302	Selective regeneration of carbonyl compounds from aldoximes and ketoximes, catalyzed by FeCl3 and SeO2	An oxidative deblocking procedure of aldoximes using FeCl3 and ketoximes using SeO2 in aprotic solvent is reported. Reaction yields are competitive as compared to previous methods. Reactions are easy to work and conditions are mild. Some important features of FeCl3 are mentioned.
R1 = alkyl, aryl, heteryl. R2 = H, When (a), R2 = alkyl, aryl When (b).
	R V Hangarge, A S Mane, V P Chavan & M S Shingare*

1305	Studies on aroylation of o-phenylenediamine and subsequent reactions with electrophiles	Condensation of o-phenylenediamine 1 with benzoyl chloride gives a dibenzoyl derivative 2 irrespective of the molar ratios employed. However, with arylsulphonyl chlorides, a 1:1 (i.e. 3) or 1:2 (i.e. 4) products are obtained depending on the molar ratios used. Reaction of 3 independently with aromatic aldehydes and acetonylacetone result in the formation of 5 and 6 respectively.
	P K Dubey*, Subhash M Kulkarni & R Vinod Kumar
1310	Substituted pyrazolines and their cardiovascular activity	1,3-Diphenyl-2-propen-1-ones (chalcones) 3 on reaction with thiosemicarbazide yield 1-thiocarbamoyl-3, 5-diphenyl-2-pyrazolines 4. 3 on condensation with arylisothiocynate give 1-N substituted thiocarbamoyl-3,5-diphenyl-2-pyrazolines 5. Compounds 3c, 5b, 5c, 5d, 5h, 5i, 5j exhibit potent cardiovascular and higher ALD50 activity.
	Vineet Malhotra, Seema Pathak, Rajendra Nath, Devashis Mukerjee & Kripa Shanker*
1314	Synthesis and biocidal activity of 2-aryl/aryl-oxymethyl-1,3,4-oxa/thiadiazolo[4,5-b][1,2,4]tri-azolo[5,4-c]thiazolo-spiro-7-cyclohexanes	2-Aryl / aryloxymethyl-1, 3, 4-oxa/thiadiazolo[4,5-b] [1,2,4]triazolo[5,4-c]thiazolospiro-7-cyclohexane (4 and 8) have been synthesised by cyclisation of 3-[2-aryl/aryloxymethyl-1, 3, 4-oxa/thiadiazol-5-yl]imino-spiro (cyclohexane-1,2-thiazolidin-4-ones) (3 and 7) with conc. H2SO4 in cold. All compounds have been assayed for their fungicidal activity against Pyricularia oryzae, Pseudopersonospora cubansis, Sphaerotheca fulginea, Phytophthora infestans and Puccinia coronata.
	Nizamuddin*, Shafqat Alauddin, H C Gupta & Manoj Kumar Srivastav

1319		The flavonoids from Polygonum aviculare	A new flavonoid has been isolated from Polygonum aviculare, together with five known flavonoids.
		Li-Ping Sun*, Shang-Zhen Zheng, Jin-Xin Wang, Xu-Wei Shen, Xu-Dong Zheng
1321		A new tetracyclic phenol and other constituents from the roots of Bauhinia racemosa	The roots of Bauhinia racemosa Lamk. (Fam. Caesalpinioideae) afford lupeol, betulin and b-sitosterol along with a novel tetracyclic phenol. The latter is identified as 3-hydroxy-de-O-methyl racemosol by comparative spectral studies with racemosol and de-O-methyl racemosol isolated earlier from this plant.
		Renuka Jain*, Shahla Alam & Umesh Saxena
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