01511nas a2200229   4500008004100000022001400041245008800055210006900143260007300212300001000285490000800295520067000303653002200973653001700995653001901012653002201031100002501053700003301078700003001111700001801141856012201159       2012                        eng d  a0920-586100aSimple one pot synthesis of nano gold-mesoporous silica and its oxidation catalysis0 aSimple one pot synthesis of nano goldmesoporous silica and its o  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a92-970 v1983 a<p>A simple one pot synthesis strategy using a non ionic triblock copolymer P123 as reducing as well as templating agent has been employed to prepare nano gold particles incorporated in the pores of mesoporous silica catalyst. The catalyst is characterized by XRD, nitrogen adsorption desorption isotherms at 77 K and TEM. The presence of small gold nanopartilces (similar to 2-4 nm) clearly demonstrated that this strategy can be effective in incorporating Au inside mesochannels. The catalyst reduced at 300 degrees C in H-2 was found to be active for oxidation reactions, such as CO oxidation, and benzyl alcohol. (C) 2012 Elsevier B. V. All rights reserved.</p>10aAlcohol oxidation10aCO oxidation10aGold catalysis10aMesoporous silica1 aSekhar, A., C. Sunil1 aSivaranjani, Kumarsrinivasan1 aGopinath, Chinnakonda, S.1 aVinod, C., P.  uhttps://library.ncl.res.in/content/simple-one-pot-synthesis-nano-gold-mesoporous-silica-and-its-oxidation-catalysis-001830nas a2200229   4500008004100000022001400041245012500055210006900180260010600249300001400355490000700369520092000376653003101296653001901327653001901346653002401365653002001389100002101409700002401430700001901454856012701473       2013                        eng d  a0040-402000aMetal-mediated alkynediol cycloisomerization: first and second generation formal total syntheses of didemniserinolipid B0 aMetalmediated alkynediol cycloisomerization first and second gen  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcFEB  a1881-18960 v693 a<p>A formal total synthesis of didemniserinolipid B was developed by employing a regioselective metal-mediated 6-endo-dig alkynol-cycloisomerization reaction. Two routes for the synthesis of key Burke's intermediate have been developed. Our initial approach involved the introduction of a C-17-allcynol followed by Pd-mediated cycloisomerization and then coupling with the serinol unit prior to the introduction of an alpha,beta-unsaturated ester unit through selective oxidation of 1 degrees-OH followed by a two-carbon Wittig homologation. Alternatively, the second generation strategy featuring the serinol coupling with the C-17-alkynol followed by alkyne addition to the epoxide and subsequent Au-mediated cycloisomerization of an acetonide protected alkynediol unit has been executed. This approach has avoided several late stage protection-deprotection events. (C) 2012 Elsevier Ltd. All rights reserved.</p>10aAlkynol-cycloisomerization10aBicyclic ketal10aGold catalysis10aPalladium catalysis10aZipper reaction1 aDas, Shyamsundar1 aInduvadana, Boddeti1 aRamana, C., V.  uhttps://library.ncl.res.in/content/metal-mediated-alkynediol-cycloisomerization-first-and-second-generation-formal-total-000851nas a2200217   4500008004100000022001400041245010200055210006900157260007700226300001600303490000700319653002000326653001800346653002800364653001900392653002800411100002300439700002700462700002400489856012000513       2013                        eng d  a0947-653900aSynthesis of C-disaccharides through a one-pot alkynol cycloisomerization-reductive deoxygenation0 aSynthesis of Cdisaccharides through a onepot alkynol cycloisomer  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcNOV  a15109-151140 v1910aC-disaccharides10acarbohydrates10aEpoxide-alkyne coupling10aGold catalysis10aReductive deoxygenation1 aNarute, Sachin, B.1 aRout, Jeetendra, Kumar1 aRamana, Chepuri, V.  uhttps://library.ncl.res.in/content/synthesis-c-disaccharides-through-one-pot-alkynol-cycloisomerization-reductive-001102nas a2200217   4500008004100000022001400041245006500055210006400120260010600184300001400290490000700304520032000311653001700631653002100648653002800669653001900697653002200716100002900738700001900767856009800786       2014                        eng d  a0040-402000aTotal synthesis of naturally occurring cephalosporolides E/F0 aTotal synthesis of naturally occurring cephalosporolides EF  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUN  a3653-36560 v703 a<p>A modular total synthesis of cephalosporolides E/F featuring sequential epoxide-alkyne coupling and subsequent highly regioselective gold catalyzed alkynolcycloisomerizatio of the resulting alkynetetrol to construct the central spiroketal core has been documented. (C) 2014 Elsevier Ltd. All rights reserved.</p>10aAlkynetetrol10aCephalosporolide10aEpoxide-alkyne coupling10aGold catalysis10aSpiroketalization1 aKona, Chandrababu, Naidu1 aRamana, C., V.  uhttps://library.ncl.res.in/content/total-synthesis-naturally-occurring-cephalosporolides-ef-001404nas a2200229   4500008004100000022001400041245008300055210006900138260007300207300001200280490000800292520061500300653001700915653001200932653001900944653002200963653002000985100001801005700002201023700001801045856011101063       2015                        eng d  a0920-586100aOxidation catalysis by large trisoctahedral gold nanoparticles: Mind the step!0 aOxidation catalysis by large trisoctahedral gold nanoparticles M  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAPR  a177-1830 v2443 a<p>To understand the origin of catalysis by gold and to probe the role of defects and interfaces, benchmark reactions namely CO oxidation and benzyl alcohol oxidation were carried out on supported trisoctahedral gold nanoparticles and on the inverse catalyst system. The sizes of these particles which are between 45 nm and 110 nm, are well beyond the quantum size regime and well above the optimum size range where gold is considered to be catalytically active. The periodic steps sites in contact with oxide support interface were able to promote the reaction. (C) 2014 Elsevier B.V. All rights reserved.</p>10aCO oxidation10aDefects10aGold catalysis10aInverse catalysta10aSteps and kinks1 aSreedhala, S.1 aSudheeshkumar, V.1 aVinod, C., P.  uhttps://library.ncl.res.in/content/oxidation-catalysis-large-trisoctahedral-gold-nanoparticles-mind-step-001658nas a2200241   4500008004100000022001400041245013300055210006900188260000800257300001200265490000600277520079500283653002901078653001901107653002801126653002401154100002601178700001801204700001701222700002201239700002801261856012701289       2016                        eng d  a2365-654900aSynthesis of Au@Ni bimetallic core shell nanoparticle and nanochains in soyabean oil and their catalytic hydrogenation reactions0 aSynthesis of AuNi bimetallic core shell nanoparticle and nanocha  cFEB  a140-1460 v13 a<p>Synthesis of Au@Ni bimetallic core shell nanostructures using commercially available soya bean oil as the solvent through a sequential reduction strategy is reported. The energy efficiency and economic viability comes from the much milder temperatures and replacement of expensive and environmentally hazardous solvents like long chain organic amines and acids previously reported for synthesis. Thus, core shell nanoparticles having size regime of 10-15 nm with an excellent control over the nickel shell thickness (2 nm) over the gold core (8-10 nm) and Au@Ni nanochains is achieved. The synthesized materials are demonstrated to synergistically catalyze hydrogenation of nitro and C-C multiple bonds with much better efficiency as compared to individual nanoparticle counterparts.</p>10aBimetallic nanoparticles10aGold catalysis10ahydrogenation reactions10asynergistic effects1 aBharathan, Vysakh, A.1 aYadukiran, V.1 aLazar, Anish1 aSingh, Anand., P.1 aVinod, Chathakudath, P.  uhttps://library.ncl.res.in/content/synthesis-auni-bimetallic-core-shell-nanoparticle-and-nanochains-soyabean-oil-and-their01363nas a2200241   4500008004100000022001400041245011400055210006900169260000800238520051600246653002700762653001900789653001900808653001500827653002600842100002700868700002200895700001500917700001800932700002200950700002100972856012800993       2019                        eng d  a1861-472800aOrtho-oxygenative 1,2-difunctionalization of diarylalkynes under merged gold/organophotoredox relay catalysis0 aOrthooxygenative 12difunctionalization of diarylalkynes under me  cOCT3 a<p>Reported herein is an ortho-oxygenative 1,2-difunctionalization of diarylalkynes under merged gold/organophotoredox catalysis to access highly functionalized 2-(2-hydroxyaryl)-2-alkoxy-1-arylethan-1-ones. Detailed mechanistic studies suggested a relay process, initiating with gold-catalyzed hydroalkoxylation of alkynes, to generate enol-ether followed by a key formal [4+2]-cycloaddition reaction. The successful application of the present methodology was also shown for the synthesis of benzofurans.</p>
10abinary catalyst system10aGold catalysis10aorganocatalyst10aphotoredox10asynthetic methodology1 aSancheti, Shashank, P.1 aAkram, Manjur, O.1 aRoy, Rupam1 aBedi, Vaibhav1 aKundu, Shubhankar1 aPatil, Nitin, T.  uhttps://library.ncl.res.in/content/ortho-oxygenative-12-difunctionalization-diarylalkynes-under-merged-goldorganophotoredox01401nas a2200217   4500008004100000022001400041245011200055210006900167260000800236300001400244490000800258520066600266653002000932653002000952653001900972653002100991653001601012100002101028700002001049856011401069       2022                        eng d  a1615-415000aCompeting intra- vs intermolecular nitrene transfer in the [Au]-catalysed reaction of 2-alkynylphenylazides0 aCompeting intra vs intermolecular nitrene transfer in the Aucata  cMAR  a1122-11330 v3643 a<p>
	The possibility of interrupting the gold-catalysed intramolecular cyclization of 2-alkynylphenylazide derivatives, employing known nitrene transfer reagents such as anthranil and its isomer 1,2-benzisoxazole, has been attempted in search of developing simple tools for product diversification. With 1,2-benzisoxazoles, the intermolecular nitrene transfer leading to quinazoline is competitive with intramolecular azidoalkyne cyclization resulting in spiro indol-3-ylidene derivatives. However, in case of the reaction in the presence of anthranil, both intra- and intermolecular nitrene transfer processes result in the same product indol-3-ylidene.</p>
10a2-Benzisoxazole10aAnthranil and 110aGold catalysis10aNitrene Transfer10aQuinazoline1 aDhote, Pawan, S.1 aRamana, Chepuri  uhttps://library.ncl.res.in/content/competing-intra-vs-intermolecular-nitrene-transfer-au-catalysed-reaction-201318nas a2200205   4500008004100000022001400041245018000055210006900235260000900304300001100313490000800324520049900332653001400831653001900845653003900864653003500903100002400938700002400962856012600986       2024                        eng d  a0040-402000aAttempted synthesis of the central 2,2-disubstituted pseudoindoxyl core of Austamide via a [Au]-catalyzed nitroalkyne cycloisomerization and intramolecular [3+2]-cycloaddition0 aAttempted synthesis of the central 22disubstituted pseudoindoxyl  cNOV   a1343010 v1673 a<p>
	Herein, we describe an Au-catalyzed cycloisomerization process of a nitroalkyne that was projected to construct the central 2,2-disubstituted pseudoindoxyl core of the natural product Austamide. Our intended strategy for forging the pseudoindoxyl core is based on the nitroalkyne cycloisomerization followed by a subsequent intramolecular [3 + 2] cycloaddition. However, the [3 + 2] cycloaddition occurred in an undesired manner, ultimately leading to a complex hexacyclic scaffold.</p>
10aAustamide10aGold catalysis10aIntramolecular [3+2] cycloaddition10aNitroalkyne cycloisomerization1 aHalnor, Swapnil, V.1 aRamana, Chepuri, V.  uhttps://library.ncl.res.in/content/attempted-synthesis-central-22-disubstituted-pseudoindoxyl-core-austamide-au-catalyzed