@article { ISI:000265517700038, title = {Facile synthesis of 5,6-dihydro-5-hydroxy-2(1H)-pyridone}, journal = {Tetrahedron Letters}, volume = {50}, number = {20}, year = {2009}, month = {MAY}, pages = {2440-2442}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A short synthesis of 5,6-dihydro-5-hydroxy-2(1H)-pyridone was achieved from L-serine employing Horner-Emmons olefination as the key step. (C) 2009 Elsevier Ltd. All rights reserved.

}, keywords = {alkaloids, Horner-Emmons olefination, L-serine, Pyridone, Z-selectivity}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2009.03.026}, author = {Upadhyay, Puspesh K. and Prasad, Rajendra and Pandey, Menaka and Kumar, Pradeep} } @article { ISI:000263218700025, title = {Novel synthesis of coumarins employing triphenyl(alpha-carboxymethylene)-phosphorane imidazolide as a C-2 synthon}, journal = {Tetrahedron Letters}, volume = {50}, number = {2}, year = {2009}, month = {JAN}, pages = {236-238}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A novel one-pot synthesis of coumarins via intramolecular Wittig cyclization from the reaction of phenolic compounds containing ortho-carbonyl group and triphenyl(alpha-carboxy methylene)phosphorane imidazolide is described. (c) 2008 Elsevier Ltd. All rights reserved.

}, keywords = {Carbonyldiimidazole, Coumarins, Intramolecular Wittig reaction, Phenolic compound, Phosphorane}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2008.10.133}, author = {Upadhyay, Puspesh K. and Kumar, Pradeep} } @article { ISI:000282106400002, title = {Concise synthesis of (2S,3S,4S)-2-(Hydroxymethyl)pyrrolidine-3,4-diol (LAB1)}, journal = {Synthesis-Stuttgart}, number = {18}, year = {2010}, month = {SEP}, pages = {3063-3066}, publisher = {GEORG THIEME VERLAG KG}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

The synthesis of (2S,3S,4S)-2-(hydroxymethyl)pyrrolidine-3,4-diol (LAB1) from Garner{\textquoteright}s aldehyde is described using the Sharpless asymmetric dihydroxylation as the key step.

}, keywords = {alkaloid, azasugars, diastereoselectivity, Garner{\textquoteright}s aldehyde, pyrrolidine, Wittig reaction}, issn = {0039-7881}, doi = {10.1055/s-0030-1258185}, author = {Upadhyay, Puspesh K. and Kumar, Pradeep} } @article { ISI:000281783500005, title = {Short and efficient synthesis of (S)-(+)-2-(Hydroxymethyl)-6-piperidin-2-one}, journal = {Synthesis-Stuttgart}, number = {15}, year = {2010}, month = {AUG}, pages = {2512-2514}, publisher = {GEORG THIEME VERLAG KG}, address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY}, abstract = {

A concise synthesis of (S)-(+)-2-(hydroxymethyl)-6-piperidin-2-one is described that employs L-aspartic acid as chiral pool starting material and Wittig reaction as the key step.

}, keywords = {Amino acid, Hydrogenation, L-aspartic acid, pipecolate, piperidone, Wittig reaction}, issn = {0039-7881}, doi = {10.1055/s-0029-1218823}, author = {Upadhyay, Puspesh K. and Kumar, Pradeep} } @article { ISI:000295113200015, title = {Asymmetric dihydroxylation route to (-)-bulgecinine}, journal = {Tetrahedron-Asymmetry}, volume = {22}, number = {11}, year = {2011}, month = {JUN}, pages = {1234-1238}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

The stereoselective synthesis of (-)-bulgecinine is reported from L-aspartic acid using Sharpless asymmetric dihydroxylation and intramolecular cyclization via nucleophilic displacement of alpha-tosylate as key steps. (C) 2011 Elsevier Ltd. All rights reserved.

}, issn = {0957-4166}, doi = {10.1016/j.tetasy.2011.06.018}, author = {Show, Krishanu and Upadhyay, Puspesh K. and Kumar, Pradeep} }