Výsledky vyhledávání - "Pabba Chittari"

Utilization of Industrial Waste Materials, 6. Utilization of Derivatives of the Bicyclic Proline Analog (all-R)-Octahydrocyclopenta[b]pyrrol-2-carboxylic Acid in the Stereoselective Synthesis

Autor: Siegfried Pohl, Detlef Haase, Srinivasachari Rajappa, Pabba Chittari, Wolfgang Saak, Jürgen Martens, Jörg Wilken, Sabine Wallbaum, Arun N. Dixit, Laxmikant N. Patkar

Publikováno v: Liebigs Annalen. 1996:927-934

Utilization of the industrial waste material benzyl (all-R)-cyclopenta[b]pyrrol-2-carboxylate 1a or its derivatives 1b, 1c as chiral auxiliaries is described. Allylation of nitrothioacetamides, proceeding by initial S-allylation followed by a facile

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::dc7e10cfca910958d194980b98da648b
https://doi.org/10.1002/jlac.199619960610

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Synthesis and metal complexation of chiral 3-mono- or 3,3-bis-allyl-2-hydroxypyrrolopyrazine-1,4-diones

Autor: Pabba Chittari, Srinivasachari Rajappa, Vasant Jadhav, K. Nagappa Ganesh

Publikováno v: Journal of the Chemical Society, Perkin Transactions 1. :1319-1324

A novel synthesis of chiral cyclic hydroxamic acids (4, 6, 8 and 10) related to cyclodipeptides is described. The crucial reduction of the nitro group of the N-nitroacetyl derivatives of (S)-α-amino acid esters is brought about by zinc–aq. ammoniu

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https://doi.org/10.1039/a707341k

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Synthesis of novel cyclic hydroxamic acids

Autor: Srinivasachari Rajappa, Achamma Thomas, Pabba Chittari

Publikováno v: Tetrahedron Letters. 35:3793-3796

The nitroacetyl ( S )-proline esters ( 1,3,5 ) are reduced by zinc-NH 4 Cl to the hydroxylamine stage and cyclized to provide the novel chiral bicyclic hydroxamic acids ( 2,4,6 ). Michael addition of allyl acrylate on nitroacetic acid derivatives fol

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https://doi.org/10.1016/s0040-4039(00)73101-7

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ChemInform Abstract: Nitroacetyl Group as a Peptide Synthon: Synthesis of Dipeptides with an α,α-Bisallylglycine Residue at the N-Terminus

Autor: Srinivasachari Rajappa, Sulur G. Manjunatha, Pabba Chittari

Publikováno v: ChemInform. 22

N-Nitroacetyl derivatives of L-proline, L-valine, and L-phenylalanine esters were prepared in two steps under mild conditions (Scheme 2). Regiospecific mono- and bis-allylation of these nitroacetyl derivatives were accomplished in presence of a Pd(0)

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https://doi.org/10.1002/chin.199143216

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ChemInform Abstract: Asymmetric Catalytic Dihydroxylation of Alkenes on Polymer Support: Scope and Limitation

Autor: Braj Bhushan Lohray, Achamma Thomas, Jaimala R. Ahuja, Pradeep K. Dhal, Pabba Chittari

Publikováno v: ChemInform. 24

Osmium catalyzed asymmetric dihydroxylation of alkenes has been reported using dihydroquinidine (DHQD) and dihydroquinine (DHQ) on a polystyrene support. Effect of other oxidants and additives has been examined.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a7e99f3ec1aa9518780a712287565450
https://doi.org/10.1002/chin.199304102

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