01060nas a2200181   4500008004100000245010800041210006900149260000800218300001400226490000700240520039500247100002000642700002000662700002000682700002100702700002500723856013000748       2017                        eng d00aMetal-free radical trifluoromethylation of beta-nitroalkenes through visible-light photoredox catalysis0 aMetalfree radical trifluoromethylation of betanitroalkenes throu  cJUN  a6760-67630 v533 aA catalytic method for functional group interconversion is immensely important in modern sciences. Here, we report an efficient catalytic conversion of nitroalkenes to highly stereoselective 1-trifluoromethylalkenes at room temperature. This unprecedented metal-free photocatalytic strategy is simple and operates under visible-light irradiation using the commercially available CF3 source.1 aMidya, Siba, P.1 aRana, Jagannath1 aAbraham, Thomas1 aAswin, Bhaskaran1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/metal-free-radical-trifluoromethylation-beta-nitroalkenes-through-visible-light-photoredox02009nas a2200217   4500008004100000245017300041210006900214260000800283300001600291490000600307520117200313100002101485700002801506700001701534700002001551700002401571700002101595700002501616700002001641856013001661       2017                        eng d00aPredesigned metal-anchored building block for in situ generation of Pd nanoparticles in porous covalent organic framework: application in heterogeneous tandem catalysis0 aPredesigned metalanchored building block for in situ generation   cAPR  a13785-137920 v93 aThe development of nanoparticle-polymer-hybrid-based heterogeneous catalysts with high reactivity and good recyclability is highly desired for their applications in the chemical and pharmaceutical industries: Herein, we have developed a novel synthetic strategy by choosing a predesigned metal-anchored building block for in situ generation of metal (Pd) nanoparticles in the stable, porous, and crystalline covalent organic framework (COF), without using conventional reducing agents. In situ generation of Pd nanoparticles in the COF Skeleton is explicitly confirmed' from PXRD, XPS, TEM images, and N-15 NMR spectral analysis. This hybrid material is found to be an excellent reusable heterogeneous catalyst for the synthesis of biologically and pharmaceutically important 2-substituted benzofurans from 2-bromophencils and terminal alkynes via a tandem process with the turnover number up to 1101. The heterogeneity of the catalytic process is unambiguously verified by a mercury poisoning experiment and leaching test. This hybrid material shows superior catalytic performance compared to commercially available homogeneous as well as heterogeneous Pd catalysts.1 aBhadra, Mohitosh1 aSasmal, Himadri, Sekhar1 aBasu, Arghya1 aMidya, Siba, P.1 aKandambeth, Sharath1 aPachfule, Pradip1 aBalaraman, Ekambaram1 aBanerjee, Rahul  uhttps://library.ncl.res.in/content/predesigned-metal-anchored-building-block-situ-generation-pd-nanoparticles-porous-covalent01537nas a2200361   4500008004100000022001400041245007800055210006900133260000800202300001400210490000700224520045500231653002800686653001300714653001400727653001100741653001300752653002000765653002100785653003900806653002400845653002600869653001200895653001700907653001900924653002300943653002500966100002000991700001801011700001801029700002501047856010301072       2017                        eng d  a0039-788100aSimple cobalt(II) chloride catalyzed N-alkylation of amines with alcohols0 aSimple cobaltII chloride catalyzed Nalkylation of amines with al  cSEP  a3957-39610 v493 a<p><span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; background-color: rgb(248, 248, 248);">A facile cobalt-catalyzed N-alkylation of amines with alcohols using inexpensive, commercially available CoCl2 center dot 6H(2)O is reported. Employing this readily available cobalt catalyst, a variety of amines with wide functional group tolerance were selectively alkylated under benign conditions.</span></p>10a(Hetero)Aromatic Amines10aAlcohols10aAmination10aamines10aAnilines10aAromatic-amines10aCobalt Catalysis10aDehydrogenation Borrowing Hydrogen10aEfficient Catalysts10aHydrogen Autotransfer10aIridium10aN-alkylation10aPincer-complex10aSecondary Alcohols10aSelective Alkylation1 aMidya, Siba, P.1 aMondal, Akash1 aBegum, Ayesha1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/simple-cobaltii-chloride-catalyzed-n-alkylation-amines-alcohols01321nas a2200181   4500008004100000022001400041245008800055210006900143260000900212300001400221490000700235520069700242100002100939700002000960700002200980700002501002856011201027       2017                        eng d  a1463-926200aUnified strategy for silver-, base-, and oxidant-free direct arylation of C-H bonds0 aUnified strategy for silver base and oxidantfree direct arylatio  cMAY   a2111-21170 v193 a<p>Here, we report a dual catalytic approach for room temperature direct arylation of C-H bonds with aryldiazonium salts as a simple aryl group donor, also working as an internal oxidant via C-N-2 bond cleavage. This unified strategy has been achieved by the synergistic combination of visible-light metal-free photoredox and palladium catalysis under silver-, base-and/or additive-free conditions. The broad substrate scope, functional group tolerance, excellent regioselectivity and redox-neutral conditions of this process make it attractive for the effective synthesis of a wide range of important N-heterocyclic commodities such as dibenzo [b,d]azepine, carbazole and phenanthridine.</p>1 aSahoo, Manoj, K.1 aMidya, Siba, P.1 aLandge, Vinod, G.1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/unified-strategy-silver-base-and-oxidant-free-direct-arylation-c-h-bonds00985nas a2200193   4500008004100000022001400041245015100055210006900206260000800275300001000283490000700293520025200300100002000552700002200572700002100594700002000615700002500635856013100660       2018                        eng d  a1359-734500aCobalt-catalyzed acceptorless dehydrogenative coupling of aminoalcohols with alcohols: direct access to pyrrole, pyridine and pyrazine derivatives0 aCobaltcatalyzed acceptorless dehydrogenative coupling of aminoal  cJAN  a90-930 v543 a<p>Here, the first example is reported of a new, molecularly defined SNS-cobalt(II) catalyst for the acceptorless dehydrogenative coupling (ADC) of unprotected amino alcohols with secondary alcohols leading to pyrrole and pyridine derivatives.</p>1 aMidya, Siba, P.1 aLandge, Vinod, G.1 aSahoo, Manoj, K.1 aRana, Jagannath1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/cobalt-catalyzed-acceptorless-dehydrogenative-coupling-aminoalcohols-alcohols-direct-access01048nas a2200193   4500008004100000022001400041245013800055210006900193260000800262300001400270490000600284520032000290100002000610700002700630700002200657700001900679700002500698856013100723       2018                        eng d  a2044-475300aDirect access to N-alkylated amines and imines via acceptorless dehydrogenative coupling catalyzed by a cobalt(ii)-NNN pincer complex0 aDirect access to Nalkylated amines and imines via acceptorless d  cJUL  a3469-34730 v83 a<p>A simple, phosphine-free Co(ii)-NNN pincer complex catalyzed direct N-alkylation of anilines with alcohols via hydrogen auto-transfer (HA) and selective acceptorless dehydrogenative coupling (ADC) of benzylamines with alcohols affording imines with the liberation of molecular hydrogen and water is reported.</p>1 aMidya, Siba, P.1 aPitchaimani, Jayaraman1 aLandge, Vinod, G.1 aMadhu, Vedichi1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/direct-access-n-alkylated-amines-and-imines-acceptorless-dehydrogenative-coupling-catalyzed01486nas a2200193   4500008004100000245011800041210006900159260000800228300001400236490000700250520076300257100002001020700002001040700002701060700003001087700001901117700002501136856013101161       2018                        eng d00a Ni-catalyzed alpha-alkylation of unactivated amides and esters with alcohols by hydrogen auto-transfer strategy 0 aNicatalyzed alphaalkylation of unactivated amides and esters wit  cNOV  a3911-39160 v113 aA transition-metal-catalyzed borrowing hydrogen/hydrogen auto-transfer strategy allows the utilization of feedstock alcohols as an alkylating partner, which avoids the formation of stoichiometric salt waste and enables a direct and benign approach for the construction of C-N and C-C bonds. In this study, a nickel-catalyzed alpha-alkylation of unactivated amides and ester (tert-butyl acetate) is carried out by using primary alcohols under mild conditions. This C-C bond-forming reaction is catalyzed by a new, molecularly defined nickel(II) NNN-pincer complex (0.1-1 mol %) and proceeds through hydrogen auto-transfer, thereby releasing water as the sole byproduct. In addition, N-alkylation of cyclic amides under Ni-catalytic conditions is demonstrated.1 aMidya, Siba, P.1 aRana, Jagannath1 aPitchaimani, Jayaraman1 aNandakumar, Avanashiappan1 aMadhu, Vedichi1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/ni-catalyzed-alpha-alkylation-unactivated-amides-and-esters-alcohols-hydrogen-auto-transfer01174nas a2200205   4500008004100000022001400041245010200055210006900157260000800226300001200234490000600246520045100252100002200703700002700725700002000752700002600772700001900798700002500817856012600842       2018                        eng d  a2044-475300aPhosphine-free cobalt pincer complex catalyzed Z-selective semi-hydrogenation of unbiased alkynes0 aPhosphinefree cobalt pincer complex catalyzed Zselective semihyd  cJAN  a428-4330 v83 a<p>Herein, we report a novel, molecularly defined NNN-type cobalt pincer complex catalyzed transfer semi-hydrogenation of unbiased alkynes to Z-selective alkenes. This unified process is highly stereo-and chemo-selective and exhibits a broad scope as well as wide functional group tolerance. Ammonia-borane (AB), a bench-stable substrate with high gravimetric hydrogen capacity, was used as a safe and practical transfer hydrogenating source.</p>1 aLandge, Vinod, G.1 aPitchaimani, Jayaraman1 aMidya, Siba, P.1 aSubaramanian, Murugan1 aMadhu, Vedichi1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/phosphine-free-cobalt-pincer-complex-catalyzed-z-selective-semi-hydrogenation-unbiased01432nas a2200193   4500008004100000022001400041245008400055210006900139260000800208300001400216490000700230520077600237100002001013700002601033700001701059700001801076700002501094856011901119       2021                        eng d  a0022-326300aTandem acceptorless dehydrogenative coupling-decyanation under nickel catalysis0 aTandem acceptorless dehydrogenative couplingdecyanation under ni  cJUN  a7552-75620 v863 aThe development of new catalytic processes based on abundantly available starting materials by cheap metals is always a fascinating task and marks an important transition in the chemical industry. Herein, a nickel-catalyzed acceptorless dehydrogenative coupling of alcohols with nitriles followed by decyanation of nitriles to access diversely substituted olefins is reported. This unprecedented C=C bond-forming methodology takes place in a tandem manner with the formation of formamide as a sole byproduct. The significant advantages of this strategy are the low-cost nickel catalyst, good functional group compatibility (ether, thioether, halo, cyano, ester, amino, N/O/S heterocycles; 43 examples), synthetic convenience, and high reaction selectivity and efficiency.1 aMidya, Siba, P.1 aSubaramanian, Murugan1 aBabu, Reshma1 aYadav, Vinita1 aBalaraman, Ekambaram  uhttps://library.ncl.res.in/content/tandem-acceptorless-dehydrogenative-coupling-decyanation-under-nickel-catalysis