32723-67-4Relevant articles and documents
Electricity Driven 1,3-Oxohydroxylation of Donor-Acceptor Cyclopropanes: a Mild and Straightforward Access to β-Hydroxy Ketones
Banerjee, Prabal,Maajid Taily, Irshad,Saha, Debarshi
supporting information, p. 5053 - 5057 (2021/09/30)
An unprecedented external oxidant-free electrochemical protocol for 1, 3-oxohydroxylation of donor-acceptor cyclopropane is disclosed. The strategy encompasses the activation of the labile π-electron cloud of the aryl ring to cleave the strained Csp3?Csp3 bond of cyclopropane to afford the β-hydroxy ketones via insertion of molecular oxygen. More significantly, based on the detailed mechanistic investigations and cyclic voltammetry experiments, a plausible mechanism is proposed.
Volatiles from the xylarialean fungus Hypoxylon invadens
Dickschat, Jeroen S.,Wang, Tao,Stadler, Marc
, p. 734 - 746 (2018/04/16)
The volatiles emitted by agar plate cultures of the xylarialean fungus Hypoxylon invadens were investigated by use of a closed loop stripping apparatus in combination with GC-MS. Several aromatic compounds were found that could only be identified by comparison to all possible constitutional isomers with different ring substitution patterns. For the set of identified compounds a plausible biosynthetic scheme was suggested that gives further support for the assigned structures.
Towards the rational design of novel charge-transfer materials: Biaryls with a dihedral angle-independent hole delocalization mechanism
Ivanova, Lena V.,Navale, Tushar S.,Wang, Denan,Lindeman, Sergey,Ivanov, Maxim V.,Rathore, Rajendra
supporting information, p. 5851 - 5854 (2018/06/13)
Biaryl cation radicals are important electroactive materials, which show two mechanisms of hole delocalization: static delocalization at small interplanar dihedral angles and dynamic hopping at larger angles, reflecting the interplay between electronic coupling and structural reorganization. Herein, we describe the rational design of biaryls possessing an invariant hole delocalization mechanism.
Synthetic studies on Ecteinascidin-743: synthesis of building blocks through Sharpless asymmetric dihydroxylation and aza-Michael reactions
Chandrasekhar,Reddy, N. Ramakrishna,Rao, Y. Srinivasa
, p. 12098 - 12107 (2007/10/03)
A practical and an efficient synthesis of three building blocks of tetrahydroisoquinoline alkaloid Ecteinascidin-743 was accomplished, starting from readily available piperonal, 2-methyl anisole, and veratraldehyde. A combination of Vilsmeier-Haack reaction and Sharpless asymmetric dihydroxylation was employed for the synthesis of building blocks A and B whereas a Heck reaction in PEG-2000 and aza-Michael reactions were employed for the synthesis of building block C.
PEROXISOME PROLIFERATOR ACTIVATED RECEPTOR MODULATORS
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Page/Page column 102-103, (2010/02/11)
The present invention is directed to a compound of formula (I), or a pharmaceutically acceptable salt, solvate hydrate or stereoisomer thereof, which is useful in treating or preventing disorders mediated by a peroxisome proliferator activated receptor (PPAR) such as syndrome X, type II diabetes, hyperglycemia, hyperlipidemia, obesity, coagaulopathy, hypertension, arteriosclerosis, and other disorders related to syndrome X and cardiovascular diseases.
An eco-friendly regeneration of aldehydes exploiting ammonium acetate under microwave irradiation
Mitra, Alok Kumar,Karchaudhuri, Nilay,De, Aparna
, p. 237 - 239 (2007/10/03)
A number of bisulphite addition products and diacetates are deprotected separately to the corresponding aldehydes exploiting a green reagent, ammonium acetate in solvent-free conditions under microwave irradiation by a rapid, clean, efficient and high yielding method under environmentally benign conditions.
Isoquinoline compound melanocortin receptor ligands and methods of using same
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, (2008/06/13)
The invention relates to melanocortin receptor ligands and methods of using the ligands to alter or regulate the activity of a melanocortin receptor. The invention further relates to tetrahydroisoquinoline aromatic amines that function as melanocortin receptor ligands and as agents for controlling cytokine-regulated physiologic processes and pathologies, and combinatorial libraries thereof.
Iodination of Methylated Anisoles: Unusual Aryl Methyl Replacement and Oxidations
Panetta, Charles A.,Fang, Zheng,Mattern, Daniell L.
, p. 7953 - 7958 (2007/10/03)
The treatment of methylated anisoles with iodine, periodic acid, sulfuric acid, and aqueous acetic acid has resulted in iododemethylations and/or aryl methyl oxidations in addition to the expected mono- and diiodinations of the aromatic ring.Four dimethylanisoles and o-methylanisole were treated under identical conditions.Iododemethylations were observed in three of the four dimethylanisoles and aryl methyl oxidations to benzaldehydes occured with o-methylanisole and two of the dimethylanisoles.No precedence could be found for either of these reactions under the experimental conditions employed.Several possible mechanisms are discussed for these transformations.Some experimental evidence suggests that methyl oxidation to a benzaldehyde could be a prerequisite for an iododemethylation via an iodonium ion-assisted reverse Gatterman-Koch reaction; single-electron-transfer or classical electrophilic mechanisms are also consistent with the iododemethylations.
Radical-Cation Catalysis in the Synthesis of Diphenylmethanes via the Dealkylative Coupling of Benzylic Ethers
Rathore, Rajendra,Kochi, Jay K.
, p. 7479 - 7490 (2007/10/03)
The dealkylative coupling of benzyl alkyl ethers (ArCH2OR) to yield the corresponding diarylmethanes (ArCH2Ar) together with dialkoxymethane (ROCH2OR) is catalyzed by small amounts of 1-electron oxidants (such as aromatic cation radicals, NO(1+), etc.) or by an equivalent electrochemical (anodic) method.The catalytic method is successfully employed for the facile synthesis of a novel macrocyclic crown ether 18 that contains a diarylmethane linkage.On the basis of the spectral observation of the radical cation ArCH2OR.+ and the excellent catalytic efficiency with turnover numbers in excess of 1E2, an electron-transfer and an alternative electrophilic chain mechanism are discussed for the dealkylative coupling process.
Diterpenes of Azadirachta indica. Syntheses to confirm structure
Burnell,Dumont,Theberge,Desfosses
, p. 2571 - 2578 (2007/10/02)
The structure of the diterpene nimbinone 1b has been confirmed by syntheses via a cascade cyclisation and also from podocarpic acid by two separate series of transformations. Synthesis of structure 3b from dehydroabietic acid shows that this does not exhibit the properties described for nimbosodione.