Gurdial Singh

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Treatment of 5-(tert-butyldimethylsilyl)-2,3-O-isopropylidene-D-ribose with lithium acetylides gave mixtures of syn- and anti-alkynols 2a-2c which were separated following protection as methoxymethyl ethers. These were converted to the corresponding iodides which underwent 6-exo-dig radical cyclisation to afford chiral cyclohexanes and carbasugars.(More)
The Seventh Meeting of the Conference of the Parties (2004) of the Convention on Biological Diversity established a mandate for the negotiation of an international regime on Access to Genetic Resources and Benefit Sharing arising from their utilization. Negotiations have been proceeding and have entered the final phase. Seven working group meetings have(More)
A novel series of optically active 2-aminobenzothiazole derivatives were synthesized by reaction of optically active amine (I) with thiophosgene to obtain optically active isothiocyanates (IIa-h) which on condensation with 4-fluoro-3-chloro aniline (III) yielded various optically active thioureas (IVa-h). Further oxidative cyclisation in the presence of(More)
Accepted: 27/09/2015 Abstract The present study was conducted on lingual tonsil of 10 young male pigs of 8-10 months age of local mixed breed for light and scanning electron microscopic studies. The lingual tonsil was lined by stratified squamous keratinized to non-keratinized epithelium having different strata. This epithelium modified into reticular(More)
Three novel metal squaric acid-peptide complexes, SQI-SQIII were prepared by addition of indium triflate or zinc chloride to the previously reported compounds [1], 3-(hydroxymethylamino)-4-(l-isoleucine methyl ester)-3-cyclobutene-1,2-dione (squarate 1), and 3-(hydroxymethylamino)-2-(l-isoleucine methyl ester)-4-thioxo-2-cyclobuten-1-one (squarate 2). The(More)
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