Indian Journal of Chemistry
Sect. B: Organic Chemistry including Medicinal Chemistry Total visitors: 2,440  since 14-07-08
VOL. 47B		NUMBER 7		July 2008
CONTENTS
Papers
1063	A facile synthesis of novel triazabicyclic molecules as potential bicyclic templates for pharmaceutical ligands by the ring opening metathesis-cross metathesis of triazatricyclo[3.2.1.0^2,6]dec-8-ene-3,5-diones		Novel multifunctional triazabicyclic molecules are synthesized in excellent yields by the ring opening metathesis-cross metathesis of triazatricyclo [3.2.1.0^2,6]dec-8-ene-3,5-diones with various terminal olefins. The rigid synthesized molecules can be used as potential bicyclic templates for a number of pharmaceutically important ligands.
	Saithalavi Anas, Chechattil Sarika, Rani Rajan & K V Radhakrishnan*
1071	Synthesis of novel heterocyclic calixarenes via the Diels-Alder reaction of calix[4]bis(spirodienones)		Calix[4]arene derived bis(spirodienone) can elicit diverse modes of cycloaddition by acting as both dienophile and diene in its cycloaddition with 1,2- and 1,4-benzoquinones. The experimental results leading to different cycloadducts have been rationalized on the basis of theoretical calculations.
	V B Ganga, E Suresh, C H Suresh & R Luxmi Varma*
1080	A convenient procedure for the synthesis of racemic syn-1,2-diarylethane-1,2-diols by osmate catalyzed dihydroxylation of trans-stilbenes facilitated byTröger base		Racemic (d,l) mixture of syn-1,2-diarylethane-1,2-diols are prepared from the corresponding substituted trans-stilbenes by osmate catalyzed dihydroxylation facilitated by racemic Tröger base under ambient conditions.
	Sakilam Satishkumar & Mariappan Periasamy*
1084	Hantzsch synthesis of polyhydroquinolines - A simple, efficient and neat protocol		A variety of polyhydroquinolines have been synthesized under eco-benign conditions. The reaction proceeds smoothly without any catalyst at room temperature in short reaction time. The yields and purity are excellent.
	Pandurangan Arumugam & Paramasivan T Perumal*
1091	Cu(OTf)2 catalyzed Biginelli type condensation of aldehydes, β-keto esters and carbamates: Synthesis of 3,4-dihydro[1,3]oxazin-2-ones
	Arun R Jagdale, Abhimanyu S Paraskar & Arumugam Sudalai*
1096	Facile synthesis of alkoxyphthalimide derivatized benzimidazole assembled pyrazoles, pyrimidines and isoxazoles, via common intermediate chalcone		Some 2-(3-aryl-2-phenyl-3,4-dihydropyrazol-5-yl)-1-N-alkoxyphthalimidobenzimidazole 9a-h, 4-(1-N-alkoxyphthalimidobenzimidazol-2-yl)-6-arylpyrimidin-2-amine 10a-h, 2-(5-aryl-4,5-dihydroisoxazol-3-yl)-1-N-alkoxyphthalimidobenzimidazole 11a-h have been synthesized by two alternative reaction routes. Synthesized compounds have been characterized by analytical and spectral studies.
	Archita Bapna, Swati Ojha & G L Talesara*
1108	A task specific basic ionic liquid, [bmIm]OH-promoted efficient, green and one-pot synthesis of tetrahydrobenzo[b]pyran derivatives		An efficient method for the synthesis of a variety of 4H-benzo[b]pyran derivatives by a one-pot three component condensation of aldehydes, cyclohexa-1,3-diones and malononitrile/ethyl cyano acetate has been developed using an ionic liquid, [bmIm]OH at room temperature under organic solvent free conditions.
	Brindaban C Ranu*, Subhash Banerjee & Sudeshna Roy
1113	Synthesis of highly functionalised linear pentacyclic compounds from Baylis-Hillman adduct of heteroaldehydes with azomethine ylides via [3+2] cycloaddition		Montmorillonite K10 clay promoted one-pot synthesis of penta- and tetracyclic systems from Baylis-Hillman adduct of heteroaldehydes with azomethine ylides generated from ninhydrin and proline or sarcosine via [3+2] cycloaddition is reported.
	Ponnusamy Shanmugam*, Suchithra Madhavan, Baby Viswambharan & Vadivel Vaithiyanathan
1117	A facile synthesis of novel dispiroindano thiazolo[2,3-b]benzo[h]quinazoline pyrrolidines through 1,3-dipolar cycloaddition reaction
	S Kathiravan & R Raghunathan*
1120	Design and synthesis of spiro-heterocycles by ring-closing metathesis
	Sambasivarao Kotha* & Ashoke Chandra Deb
1135	Synthesis and QSAR studies of 4-oxo-thiazolidines and 2-oxo-azetidines as potential antibacterial agents		Several 2-(4-chlorophenyl)-N-(4-oxo-2-aryl(l,3,thiazolidin-3-yl))acetamides 2, N-[3-chloro-4-(2-aryl)-2-oxo-azetidinyl]-2-(4-chlorophenyl)acetamides 3, N-(4-oxo-2-aryl(1,3,-thiadiazolidin-3-yl){4-[5-oxo-2-phenyl-4-(phenylmethylene)(2-imidazolinyl) phenyl} carboxamides 7 and N-(3-chloro-2-oxo-4-arylazetidinyl){4-[5-oxo-2-phenyl-4-(phenylmethylene)(2-imidazolinyl)]phenyl}carboxamides 8 have been synthesised and evaluated for their antibacterial activity. The QSAR studies of the new bio-active molecules have been carried out by Hansch’s LFER method.
	N C Desai*, M D Shah, A M Bhavsar & A K Saxena
	Notes
1145	Synthesis and cytotoxicity studies of thiazole analogs of the anticancer marine alkaloid dendrodoine		The synthesis and cytotoxicity evaluation of 2-N,N-dimethylamino-5-indol-3-oylthiazole and its other 5-hetaroyl derivatives 2a-h as members of a novel portfolio of the thiazole analogs of the cytotoxic marine alkaloid dendrodoine (3-N,N-dimethylamino-5-indol-3-oyl-1,2,4-thiadiazole) 1 is reported.
	T F Abbs Fen Reji, S K C Devi, K K Thomas, K G Sreejalekshmi, S L Manju, M Francis S K Philip, A Bharathan & K N Rajasekharan*
1151	Dynamic ^1H NMR study of rotational energy barrier around the aryl-nitrogen single bond in γ-spiroiminolactones derived from reaction between 2,6-dimethylphenyl isocyanide and dialkyl acetylenedicarboxylates in the presence of phendione		The free-energy of the activation (ΔG^≠) for restricted rotation around the aryl-nitrogen single bonds in γ-spiroiminolactones has been calculated by dynamic ^1H NMR studies.
	Malek Taher Maghsoodlou*, Ghasem Marandi, Sayyed Mostafa Habibi Khorassani, Lotfali Saghatforoush, Ali Aminkhani & Roya Kabiri
1154	A mild, efficient and one-pot synthesis of 2-substituted benzimidazoles by ZrOCl2.8H2O catalyzed ring closure reaction		A mild, efficient and one-pot synthesis of an array of 2-substituted benzimidazoles from an appropriate o-phenylenediamine and orthoesters such as orthoformate, orthoacetate and orthovalerate using ZrOCl2.8H2O at room temperature and under microwave irradiation is described. Eco-friendly, solvent-free methodology has been employed under microwave condition. Compared with the conventional method, microwave irradiation method has the advantages of excellent yields (81-93%) and shorter reaction time (5-10 min).
	Ch Sanjeeva Reddy* & A Nagaraj
1160	MgCl2·6H2O/p-TSA catalyzed simple and efficient synthesis of some known and novel quinolines		A simple and an efficient method has been developed for the condensation of o-aminoaryl ketones with α-methylene ketones in the presence of catalytic amounts of MgCl2·6H2O/p-TSA to afford the corresponding fused cyclic quinolines in high yield using the Friedlander heteroannulation reaction. The reaction works at ambient temperature to give the products within 40 min.
	M A Pasha* ,V P Jayashankara & K A Mahammed^‡
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