• R B N PRASAD

      Articles written in Journal of Chemical Sciences

    • The impact of sugar and fatty acid on the bioactivity of N-fatty acyl-L-tyrosine aglycone

      SRIKANTH VUDHGIRI R B N PRASAD Y POORNACHANDRA C GANESH KUMAR E ANJANEYULU K SIRISHA RAM CHANDRA REDDY JALA

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      In the present study, a series of fatty acids-based (short, medium and long unsaturated chains) glycosylated N-fatty acyl-L-tyrosines and N-lipoyl-L-tyrosine methyl esters were synthesized and evaluated for their cytotoxic and antimicrobial activities. The aglycone moiety was synthesized using different chemicalreagents. The glycosylation of aglycone moiety with different carbohydrates was performed using the Lewis acid, BF3.Et2O. All the synthesized compounds were tested against a panel of four cancer cell lines. The glycosylated N-fatty acyl-L-tyrosines showed moderate activity against all the cell lines and the IC50 values were in the range of 15.6−45.6 μM. However, the oleic acid analogues (10a, 10d) exhibited IC50 values of 15.6, 17.6 μM, respectively, against MDA-MB-231 cell line. Glycosylated N-lipoyl-L-tyrosine methyl esters (6b–6d) showed promising activity against all the tested cell lines and the IC50 values ranged between 9.4−13.8 μM. The compound 6d exhibited significant cytotoxicity and IC50 values were 10.5, 9.4, 10.9 and 12.1 μM against A549, PC3, MDA-MB-231 and HepG2 cell lines, respectively. Moreover, the nonglycosylated N-fatty acyl-L-tyrosine and methyl N-fatty acyl-L-tyrosinate derivatives showed excellent and moderate antimicrobial activity against some of the tested bacterial strains.

    • Olefin metathesis of fatty acids and vegetable oils

      VYSHNAVI YELCHURI K SRIKANTH R B N PRASAD M S L KARUNA

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      The article reviews various olefin metathesis reactions namely self-metathesis (SM), crossmetathesis (CM), acyclic diene metathesis (ADMET) polymerization, ring closing metathesis (RCM) and ring opening metathesis (ROM) reactions for the synthesis of a variety of platform chemicals with potential industrialapplications from vegetable oils and fatty acids. Different fatty acids employed for various metathesis reactions were oleic, linoleic, linolenic, eicosenoic, erucic, petroselinic, sterculic, undecenoic and ricinoleic acids, while vegetable oils used were Helianthus (sunflower), Brassica napus (rapeseed), Glycine max(soybean), Hevea brasiliensis (rubber), Butea monosperma(palash), Nicotiana tabacum (tobacco) and Sterculia foetida (jangli badam). Even though Grubbs’ catalysts were employed formost of the reactions, other catalysts such as rhenium,molybdenum and tungsten based have also been used for selective reactions of vegetable oils and fatty acids.The article reviews some of the mechanistic pathways involved in the generation of unusual intermediates from fatty acids and triglycerides.

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