J Richard Premkumar
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Explore the profile of J Richard Premkumar including associated specialties, affiliations and a list of published articles.
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9
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40
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Recent Articles
1.
Das A, Kumaran S, Ravi Sankar H, Premkumar J, Sundararaju B
Angew Chem Int Ed Engl
. 2024 Jun;
63(40):e202406195.
PMID: 38896502
In this study, we unveil a novel method for the asymmetric dearomatization of indoles under cobalt/photoredox catalysis. By strategically activating C-H bonds of amides and subsequent migratory insertion of π-bonds...
2.
Das A, Mandal R, Ravi Sankar H, Kumaran S, Premkumar J, Borah D, et al.
Angew Chem Int Ed Engl
. 2023 Dec;
63(6):e202315005.
PMID: 38095350
Metal-catalyzed asymmetric C-H bond annulation strategy offers a versatile platform, allowing the construction of complex P-chiral molecules through atom- and step-economical fashion. However, regioselective insertion of π-coupling partner between M-C...
3.
Isolation of Cp*Co -Alkenyl Intermediate in Efficient Cobalt-Catalyzed C-H Alkenylation with Alkynes
Sen M, Rajesh N, Emayavaramban B, Premkumar J, Sundararaju B
Chemistry
. 2017 Nov;
24(2):342-346.
PMID: 29164708
A general and efficient procedure for C-H alkenylation of arenes with a broad substrate scope catalyzed by Cp*Co was demonstrated with alkynes. A highly selective mono-alkenylation and sequential bis-C-H bond...
4.
Sen M, Dahiya P, Premkumar J, Sundararaju B
Org Lett
. 2017 Jul;
19(14):3699-3702.
PMID: 28665624
An efficient, unprecedented reactivity of Cp*Co(III) for the synthesis of tetrasubstituted allenes under mild conditions is disclosed. Electron-rich and highly nucleophilic cobalt facilitates the dehydrative C-H bond allenylation directly from...
5.
Kalsi D, Laskar R, Barsu N, Premkumar J, Sundararaju B
Org Lett
. 2016 Aug;
18(17):4198-201.
PMID: 27533734
An unprecedented C(8)-H bond allylation of quinoline with allyl carbonate and allyl alcohol catalyzed by Cp*Co(III) using a traceless directing group via β-oxygen and β-hydroxy elimination is described. This site-selective...
6.
Barsu N, Sen M, Premkumar J, Sundararaju B
Chem Commun (Camb)
. 2015 Dec;
52(7):1338-41.
PMID: 26695530
An efficient, scalable, atom-economical, regio-selective air stable Cp*Co(iii) catalyzed C-H and C-O coupling via a C-H activation/oxygen atom transfer reaction of quinoline N-oxide and an internal alkyne is reported. Such...
7.
Palepu N, Nongbri S, Premkumar J, Verma A, Bhattacharjee K, Joshi S, et al.
J Biol Inorg Chem
. 2015 Feb;
20(4):619-38.
PMID: 25712889
Reaction of salicylaldehyde-2-picolinylhydrazone (HL) Schiff base ligand with precursor compounds [{(p-cymene)RuCl2}2] 1, [{(C6H6)RuCl2}2] 2, [{Cp*RhCl2}2] 3 and [{Cp*IrCl2}2] 4 yielded the corresponding neutral mononuclear compounds 5-8, respectively. The in vitro...
8.
Premkumar J, Sastry G
J Phys Chem A
. 2014 Nov;
118(48):11388-98.
PMID: 25384257
Ab initio computations, up to CCSD(T)/CBS on model systems, and MP2/cc-pVTZ and DFT calculations are performed on cation-alkane and cation-alkene complexes, cation = Li(+), Na(+), Be(2+), Mg(2+), Ca(2+), Cu(+) and...
9.
Premkumar J, Vijay D, Sastry G
Dalton Trans
. 2012 Mar;
41(16):4965-75.
PMID: 22407407
Cation interactions with π-systems are a problem of outstanding contemporary interest and the nature of these interactions seems to be quite different for transition and main group metal ions. In...