@article { ISI:000272133800017, title = {Concise enantioselective synthesis of (+)-lentiginosine}, journal = {Tetrahedron-Asymmetry}, volume = {20}, number = {19}, year = {2009}, month = {OCT}, pages = {2287-2292}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A high yielding enantioselective synthesis of the indolizidine alkaloid, (+)-lentiginosine, has been described based on asymmetric oza-Cope rearrangement and the L-proline catalyzed alpha-aminooxylation of aldehydes. The strategy also makes use of ring-closing metathesis for the construction of piperidine core. (C) 2009 Elsevier Ltd. All rights reserved.

}, issn = {0957-4166}, doi = {10.1016/j.tetasy.2009.08.027}, author = {Shaikh, Tanveer Mahamadali and Sudalai, Arumugam} } @article { ISI:000265959200028, title = {Titanium superoxide: a heterogeneous catalyst for anti-Markovnikov aminobromination of olefins}, journal = {Tetrahedron Letters}, volume = {50}, number = {23}, year = {2009}, month = {JUN}, pages = {2815-2817}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A new facile procedure for the aminobromination of olefins in high yields has been described using p-toluene sulfonamide (p-TsNH(2)) and N-bromosuccinimide (NBS) as introgen and bromine sources, respectively, and titanium superoxide as a truly heterogeneous catalyst. The formation of anti-Markovnikov product exclusively in all the cases studied possibly proceeding I free radical reaction pathway is remarkable. (C) 2009 Elsevier Ltd. All rights reserved.

}, keywords = {anti-Markovnikov addition, Bromoamination, N-Bromosuccinimide, p-Toluenesulfonamide, Titanium superoxide}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2009.03.169}, author = {Shaikh, Tanveer Mahamadali and Karabal, Pratibha U. and Suryavanshi, Gurunath and Sudalai, Arumugam} } @article { ISI:000279746300009, title = {Enantioselective synthesis of (+)-alpha-conhydrine and (-)-sedamine by L-proline-catalysed alpha-aminooxylation}, journal = {European Journal of Organic Chemistry}, number = {18}, year = {2010}, month = {JUN}, pages = {3437-3444}, publisher = {WILEY-BLACKWELL}, address = {COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA}, abstract = {

An efficient organocatalytic approach to the enantioslective synthesis of two important piperidine alkaloids, namely (+)-alpha-conhydrine (98\% ee) and (-)-sedamine (95\% ee), by L-proline-catalysed alpha-aminooxylation of aldehydes has been developed. The strategy involves an intramolecular cyclization to construct the piperidine core.

}, keywords = {alkaloids, Amino acids, Aminooxylation, Enantioselectivity, organocatalysis}, issn = {1434-193X}, doi = {10.1002/ejoc.201000169}, author = {Shaikh, Tanveer Mahamadali and Sudalai, Arumugam} } @article { ISI:000279939100026, title = {H-beta zeolite: an efficient, reusable catalyst for one-pot synthesis of isatins from anilines}, journal = {Acta Chimica Slovenica}, volume = {57}, number = {2}, year = {2010}, month = {JUN}, pages = {466-469}, publisher = {SLOVENSKO KEMIJSKO DRUSTVO}, address = {HAJDRIHOVA 19, LJUBLJANA 1000, SLOVENIA}, abstract = {

We describe a simple and highly efficient procedure for the single-step preparation of isatins from the commercially available anilines using H-beta zeolite as a truly heterogeneous catalyst. H-beta zeolite is readily separated from reaction mixture by simple filtration and reused several times without considerable loss of activity.

}, keywords = {Anilines, H-beta zeolite, heterogeneous catalyst, isatins}, issn = {1318-0207}, author = {Raj, I. Victor Paul and Shaikh, Tanveer Mahamadali and Sudalai, Arumugam} } @article { ISI:000276963200003, title = {Novel synthesis and characterization of titanium superoxide and its application in organic oxidative processes}, journal = {Catalysis Surveys from Asia}, volume = {14}, number = {1}, year = {2010}, month = {MAR}, pages = {21-32}, publisher = {SPRINGER/PLENUM PUBLISHERS}, address = {233 SPRING ST, NEW YORK, NY 10013 USA}, abstract = {

A novel, exceptionally stable titanium superoxide radical ion was prepared and its structure determined by FTIR, ESR, Raman spectroscopy, X-ray diffraction, thermogravimetric/differential thermal analysis and elemental analysis. This heterogeneous catalyst has been found to be effective for the selective oxidation of aromatic amines and phenols to the corresponding nitro aromatics and p-quinones, respectively. In addition, this non-toxic, inexpensive and reusable catalyst has also been used in aminobromination of olefins, which proceed to give the 1, 2-bromoaminated anti-Markovnikov product. A brief account of these results is summarized in this review.

}, keywords = {Amino Bromination, Anti-Markovnikov, heterogeneous catalyst, Oxidation, Titanium superoxide}, issn = {1571-1013}, doi = {10.1007/s10563-010-9085-5}, author = {Reddy, R. Santhosh and Shaikh, Tanveer Mahamadali and Rawat, Varun and Karabal, Pratibha U. and Dewkar, Gajanan and Suryavanshi, Gurunath and Sudalai, Arumugam} }