Results 221 to 228 of about 81,193 (228)

From ball-milling to bead-milling technology: rapid optimization and scale-up of a one-pot Wittig olefination-Diels-Alder reaction sequence using an agitator bead mill.

RSC Mechanochem
Biedermann N, Templ J, Banderob K, Roth PMC, Schnürch M.   +4 more
europepmc   +1 more source

ChemCell: Chemical Tethering of Large Biomolecules to Cell Surfaces through Diels-Alder Ligation

Dzijak R, Bellová S, Kovalová A, Šlachtová V, Rahm M, Beránková A, Pohl R, Vrabel M.   +7 more
europepmc   +1 more source

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Synthetic studies toward the kempane diterpenes. Diels–Alder additions to bicyclic dienes

Journal of the Chemical Society, Perkin Transactions 1, 2001
Diels–Alder additions of 2,6-dimethyl-p-benzoquinone to the bicyclic dienes 24, 30 and 32 took place with very high regio-, stereo- and facial selectivity. Reduction and then alkylation of a tetracyclic adduct with 1,3-dithienium tetrafluoroborate provided compound 56, which has the correct stereochemistry at three key carbons for elaboration to the ...
Chunjian Liu, Guanglin Bao, D. Jean Burnell   +2 more
openaire   +1 more source

Intramolecular Diels–Alder reactions of N-substituted oxazolones

Chemical Communications, 2002
The first intramolecular Diels-Alder reactions of simple trienes featuring an N-substituted oxazolone as the dienophilic component have been investigated and are reported herein.
Stephen Philip, Fearnley, Eleonora, Market   +1 more
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Stereocontrolled construction of rigid tricyclic bis(α-amino acid) derivatives by Ru(Ii)-catalyzed cascade and Diels–Alder reactions

Journal of the Chemical Society, Perkin Transactions 1, 2001
In the preparation of rigid and annulated tricyclic bis(α-amino acid) derivatives the key construction was effected by a Ru(II)-catalyzed RCM cascade reaction of gem-dienynes. The substrates were available by stepwise and stereocontrolled alkynylations and alkenylations of (2R)-2,5-dihydro-2-isopropyl-3,6-dimethoxypyrazine.
Jon Efskind, Christian Römming, Kjell Undheim   +2 more
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Competing Diels–Alder reactions of activated nitroethylene derivatives and [3,3]-sigmatropic rearrangements of the cycloadducts

Chemical Communications, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Peter A, Wade, James K, Murray, Sharmila, Shah-Patel, Hung T, Le   +3 more
openaire   +2 more sources

1,2,3,5-Tetrahydro-1,2,3-methenopentalene, a Valence Isomer of Isoindene: Synthesis and Diels–Alder Reactions This work was supported by the Fonds der Chemischen Industrie and by Chemetall GmbH. S.E.L. and D.D.P. thank Heriot-Watt University, Edinburgh, and the European Community for an Erasmus exchange scholarship. Dipl.-Chem. Patrick Musch assisted us in the performance of the quantum-chemical calculations.

Angewandte Chemie International Edition, 2002
Thomas Fischer, Ulrike Kunz, Sarah E. Lackie, Carsten Cohrs, Daniel D. Palmer, Manfred Christl   +5 more
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Highly Enantioselective Inverse-Electron-Demand Hetero-Diels–Alder Reactions of α,β-Unsaturated Aldehydes This work was supported by the NIH (GM-59316), with additional support from the Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung (postdoctoral fellowship to K.G.), and the National Science Foundation (predoctoral fellowship to D.E.C.). We are grateful to Dr. R. Staples for carrying out the X-ray crystal structure analysis of 1.

Angewandte Chemie, 2002
Karl Gademann, David E. Chavez, Eric N. Jacobsen   +2 more
openaire   +1 more source