Zobrazeno 1 - 10 of 13 pro vyhledávání: '"U. K. Kundu"'
2
Synthetic studies toward geranylated PPAP natural products oblongifolin A, oblongifolin D, and enervosanone
Autor: U. K. Kundu, Goverdhan Mehta, Manabendra Das
Publikováno v: Tetrahedron Letters. 53:4538-4542
A concise approach of general utility toward mono- and di-geranylated PPAP frameworks employing `reconstructive aldol cyclization' as the key step is delineated. (C) 2012 Elsevier Ltd. All rights reserved.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4ab5ca042cf904e7840b6317fc733fbe
https://doi.org/10.1016/j.tetlet.2012.06.045
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3
Toward a Total Synthesis of the Novel Polyketide Natural Product Spiculoic Acid A
Autor: U. K. Kundu, Goverdhan Mehta
Publikováno v: Organic Letters. 7:5569-5572
[chemical reaction: see text]. An enantioselective approach toward the recently isolated marine natural product, spiculoic acid A, conceptualized along the proposed biogenetic hypothesis, involving an intramolecular Diels-Alder reaction as the pivota
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e48faa1a60fe34fb6338e032c384ac76
https://doi.org/10.1021/ol0521329
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4
N-Iodosuccinimide — An effective reagent for regioselective heterocyclization of o-cyclohex-2′-enylanilines for the synthesis of hexahydrocarbazoles
Autor: U. K. Kundu, Nirmal K. Jana, Krishna C. Majumdar, B. Roy, U. Das
Publikováno v: Canadian Journal of Chemistry. 83:63-67
A number of carbazoles are synthesized in good yields by the N-iodosuccinimide mediated heterocyclization of o-cyclohex-2′-enylanilines in acetonitrile at –10 °C for 45 min followed by heating with palladium–charcoal (10%) in benzene (80 °C) fo
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::79e604a57b564be0e47bb03cd6fedf0f
https://doi.org/10.1139/v04-162
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5
Studies in sigmatropic rearrangement: synthesis of 3,11a-dimethyl-6a,11a-dihydro-1H,6H-pyrano[3',4':5,6]thiopyrano[4,3-b][1]benzofuran-1-one
Autor: Subhojit Ghosh, P. P. Mukhopadhyay, U. K. Kundu, K. C. Majumdar
Publikováno v: ARKIVOC, Vol 2003, Iss 9, Pp 47-57 (2004)
Thermal rearrangement of 4-aryloxymethyl-7-methylthiopyrano-[3,2-c]pyran-5-ones 6a-f afforded a number of hitherto unreported benzofuro[3,2-c]-6a,11a-dihydro-3,11adimethylthiopyranopyran-1-one 15a-e in good yields (60-67%) along with the exocyclic de
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::518c827da8408bbd0b517c73470e7602
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0004.907
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6
Synthesis of Pyrimidine Annelated Heterocycles [1]. Regioselective Heterocyclization of 6-Cyclopent-2-enyl-5-hydroxy-1,3-dimethyl-pyrimidine-2,4( 1H , 3H )-dione and 5-Cyclopent-2-enyl-6-hydroxy-1,3-dimethylpyrimidine-2,4( 1H , 3H )-dione
Autor: Nirmal K. Jana, Krishna C. Majumdar, U. K. Kundu, Swapan K. Samanta
Publikováno v: Monatshefte f�r Chemie / Chemical Monthly. 134:1137-1143
Two hitherto unreported pyrimidine annelated heterocycles were synthesized from 6-cyclopent-2-enyl-5-hydroxy-1,3-dimethylpyrimidine-2,4(1H,3H)-dione and 5-cyclopent-2-enyl-6-hydroxy-1,3-dimethylpyrimidine-2,4(1H,3H)-dione by reaction with pyridine hy
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3cd73d60af1393b3563c04ccdcd03ec5
https://doi.org/10.1007/s00706-003-0043-z
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7
Studies on triacetic acid lactone-annulated heterocycles: synthesis of 3-aryloxyacetyl-6-methyl-2,3-dihydrothieno[3,2- c ]pyran-4-ones by tandem cyclization
Autor: Krishna C. Majumdar, S. K. Ghosh, U. K. Kundu
Publikováno v: Tetrahedron. 58:10309-10313
The hitherto unreported 3-aryloxyacetyl-6-methyl-2,3-dihydrothieno[3,2- c ]pyran-4-ones were synthesized in 62–71% yield by the sulfoxide rearrangement of 4-(4′-aryloxybut-2′-ynylthio)-6-methyl-2-pyrone. The substrates were synthesized by phase
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::aedb72efb80ef0e3fa2508a5f02fea3a
https://doi.org/10.1016/s0040-4020(02)01418-7
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8
Regioselective synthesis of pyrimidine annelated heterocycles from 6-(cyclohex-2-enyl)-1,3-dimethyl-5-hydroxyuracil
Autor: U. Das, U. K. Kundu, A. Bandyopadhyay, Krishna C. Majumdar
Publikováno v: Tetrahedron. 57:7003-7007
6-(Cyclohex-2-enyl)-1,3-dimethyl-5-hydroxyuracil when treated with bromine in chloroform at 0–5°C for 6 h furnishes 6-bromo-1,3-dimethylhexahydrobenzofuro[3,2- d ]pyrimidine-2,4-dione in 80% yield. The same heterocycle is also obtained in 90% yiel
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::645f65dbf307e31587be5798bbc4dd1c
https://doi.org/10.1016/s0040-4020(01)00656-1
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10
ChemInform Abstract: Studies in Sigmatropic Rearrangement: Synthesis of a [6,6]Pyranothiopyran Ring System by Sequential Claisen Rearrangement and Pyridine Hydrotribromide Mediated Regioselective '6-Endo' Cyclization
Autor: Krishna C. Majumdar, U. K. Kundu, Subhojit Ghosh
Publikováno v: ChemInform. 33
[reaction: see text] 4-(4'-Aryloxybut-2'-ynylthio)[1]benzopyran-2-ones are refluxed in chlorobenzene to afford 4-aryloxymethylthiopyrano[3,2-c][1]benzopyran-5(2H)-ones which are subsequently subjected to heating in o-dichlorobenzene in the presence o
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::42d5ae129dcc3d04adc4c35f9f32c3fa
https://doi.org/10.1002/chin.200248146
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