Results 41 to 50 of about 66,029 (249)

Enantioselective Organocatalytic Diels-Alder Trapping of Photochemically Generated Hydroxy-o-Quinodimethanes [PDF]

, 2016
The photoenolization/Diels-Alder strategy offers straightforward access to synthetically valuable benzannulated carbocyclic products. This historical light-triggered process has never before succumbed to efforts to develop an enantioselective catalytic ...
Cuadros, Sara, Dell'Amico, Luca, Melchiorre, Paolo, Vega Pe\uf1aloza, Alberto   +3 more
core   +2 more sources

Stepwise radical cation Diels–Alder reaction via multiple pathways

Beilstein Journal of Organic Chemistry, 2018
Herein we disclose the radical cation Diels–Alder reaction of aryl vinyl ethers by electrocatalysis, which is triggered by an oxidative SET process. The reaction clearly proceeds in a stepwise fashion, which is a rare mechanism in this class.
Ryo Shimizu, Yohei Okada, Kazuhiro Chiba
doaj   +1 more source

Theoretical study on the Diels-Alder reaction of bromo-substituted 2H-pyrane-2-ones and some substituent vinyls [PDF]

Journal of the Serbian Chemical Society, 2015
A DFT study of the reactivity, regio- and stereoselectivity of Diels-Alder reaction between 3-bromo, 5-bromo, and 3,5-dibromo-2(H)-pyran-2-ones and some weakly activated and unactivated alkenes has been carried out using density functional ...
Haghdadi Mina, Amani Hamed, Nab Nasim
doaj   +1 more source

SAM-dependent enzyme-catalysed pericyclic reactions in natural product biosynthesis. [PDF]

, 2017
Pericyclic reactions-which proceed in a concerted fashion through a cyclic transition state-are among the most powerful synthetic transformations used to make multiple regioselective and stereoselective carbon-carbon bonds.
Chen, Mengbin, Hai, Yang, Houk, KN, Liu, Fang, Ohashi, Masao, Sato, Michio, Tang, Man-Cheng, Tang, Yi, Watanabe, Kenji, Yang, Zhongyue   +9 more
core   +1 more source

The use of optically active O-alkyl ester hydrochlorides of L-phenylalanine and L-tyrosine as chiral micellar media for the catalysis of diels-alder reactions

Bulletin of the Chemical Society of Ethiopia, 2018
The effect of a range of O-alkyl ester hydrochloride surfactants derived from L-phenylalanine and L-tyrosine as catalysts on the Diels-Alder reaction between cyclopentadiene and methyl acrylate was studied.
P. Caumul, P. Koonja, N. Namooya, A. Prayag, N. Joondan, S. Jhaumeer-Laulloo   +5 more
doaj   +1 more source

[2.2](4,7)Isobenzofuranophanes - Synthesis, Characterisation and Reactivity [PDF]

, 1994
The isomeric Diels-Alder adducts 3, obtained by cycloaddition of tetraphenylcyclopentadienone to the 4,5:12,13-bis-(oxanorbornadieno)[2.2]paracyclophanes syn,syn- and anti,-syn-2[Note ][The stereochemical descriptors syn and anti refer to the orientation
Bubenitschek, Peter, Hopf, Henning, Jones, Peter G., Knieriem, Burkhard, König, Burkhard, Meijere, Armin de, Ramm, Sonja   +6 more
core   +1 more source

Synthesis of 3,4-dihydro-1,8-naphthyridin-2(1H)-ones via microwave-activated inverse electron-demand Diels–Alder reactions

Beilstein Journal of Organic Chemistry, 2014
Substituted 3,4-dihydro-1,8-naphthyridin-2(1H)-ones have been synthesized with the inverse electron-demand Diels–Alder reaction from 1,2,4-triazines bearing an acylamino group with a terminal alkyne side chain.
Salah Fadel, Youssef Hajbi, Mostafa Khouili, Said Lazar, Franck Suzenet, Gérald Guillaumet   +5 more
doaj   +1 more source

Cycloadditions in mixed aqueous solvents: the role of the water concentration [PDF]

, 2005
We examined the kinetics of a series of cycloaddition reactions in mixtures of water with methanol, acetonitrile and poly(ethylene glycol) (MW 1000). The reactions include the Diels–Alder (DA) reaction between cyclopentadiene and N-n-butylmaleimide or ...
Abraham, Abraham, Adjei, Alsehaibani, Asaad, Baozue, Biswas, Biswas, Bradsher, Breon, Brisset, Bustamante, Cargill, Cargill, Cativiela, Cativiela, Cativiela, Cativiela, Chaterjee, Cox, Cox, Das, Datta, Desimoni, Desimoni, Dubbs, Dutta, Escalera, Gajewski, Ganguly, Gharmaleki, Hefter, Huisgen, Huot, Kim, Kumar, Lara, Li, Li, Li, Lizhuang, Lizhuang, Lizhuang, Maitra, Manzo, Marcus, Martin, Meijer, Otto, Otto, Paruta, Pramanik, Rideout, Rispens, Rispens, Rispens, Romero, Sangwan, Shehatta, Shehatta, Shehatta, Stephen, Turner, Turro, Valsaraj, Wijnen, Yilin   +66 more
core   +3 more sources

Endothelial Cells Angiogenesis in Sulfated Glycosaminoglycan (GAG) Hydrogels Enhanced by Bioactive Glass‐Released Ions

Advanced Functional Materials, EarlyView.
A mechanically tunable hydrogel composed of gelatin, chondroitin sulfate and laminin promotes angiogenesis in vitro without the supplement of growth factors. Endothelial cells morphogenesis was further enhanced by medium conditioned with bioactive glass 58S‐released ions (Ca and Si), thus offering a promising strategy to vascularize 3D tissue ...
Marco Piazzoni, Ilaria Borghi, Francesca Cadamuro, Sophia Dalfino, Riccardo Campanile, Sofia Nizzolo, Valeria Cassina, Francesca Tallia, Julian R. Jones, Francesco Mantegazza, Sabrina Bertini, Lorenzo Moroni, Francesco Nicotra, Laura Russo   +13 more
wiley   +1 more source

Chiral Modification of the Tetrakis(pentafluorophenyl)borate Anion with Myrtanyl Groups [PDF]

, 2019
The synthesis and characterization of chiral [B(C6F5)4]– derivatives bearing a myrtanyl group instead of a fluoro substituent in the para position are described.
Oestreich, Martin, Pommerening, Phillip
core   +1 more source