Results 71 to 80 of about 46,609 (242)

Enantioselective synthesis of non-proteinogenic 2-arylallyl-α-amino acids via Pd/In catalytic cascades [PDF]

, 2006
An efficient synthesis of both R- and S-enantiomers of 2-arylallyl-α-amino acids via a diastereoselective Pd/In mediated catalytic allylation of chiral N-sulfinyl-α-imino esters is described.
Anwar, Anwar, Cleghorn, Cleghorn, Colin Kilner, Colin W.G. Fishwick, Cooper, Cooper, Cooper, Davis, Ellman, Ellman, Evans, Grigg, Grigg, Hodgson, Hohsaka, John Blacker, Kevin Bailey, Najera, Ronald Grigg, Shaun McCaffrey, Stewart Korn, Visuvanathar Sridharan   +23 more
core   +1 more source

Computational ligand design in enantio- and diastereoselective ynamide [5+2] cycloisomerization

Nature Communications, 2016
Using a chiral catalyst to override the innate stereochemical outcome of a diastereoselective process is a challenging task. Here, the authors use theory and experiment to develop a cycloisomerization where the enantioselectivity is driven by the ...
R. N. Straker, Q. Peng, A. Mekareeya, R. S. Paton, E. A. Anderson   +4 more
doaj   +1 more source

Synthesis of cyclopropyl-substituted furans by Brønsted acid promoted cascade reactions [PDF]

, 2015
Chloroacetic acid promotes an efficient and diastereoselective intramolecular cascade reaction of electron-deficient ynenones to deliver products featuring a 2,3,5-trisubstituted furan bearing a fused cyclopropyl substituent at the 5-position ...
Achmatowicz, Albrecht, Barluenga, Benary, Boto, Casey, Ciufolini, Clark, Corma, Csuk, Csuk, Donaldson, Donohoe, Fedoryński, Feist, Fritz, Gandini, Gilchrist, González, González, Hashmi, Hou, Högberg, Jung, Knorr, Kobayashi, Krasnaya, Kuroda, Lebel, Li, Li, Lipshutz, Ma, MacMillan, Paal, Pellissier, Ripaud, Sperry, Vicente, Wang, Wessjohann, Wipf, Wu, Xia, Yang, Zhang, Zimmerman   +46 more
core   +2 more sources

Towards the total synthesis of keramaphidin B

Beilstein Journal of Organic Chemistry, 2016
The enantio- and diastereoselective Michael addition of a δ-valerolactone-derived pronucleophile to a substituted furanyl nitroolefin catalysed by a bifunctional cinchonine-derived thiourea has been used as the key stereocontrolling step in a new ...
Pavol Jakubec, Alistair J. M. Farley, Darren J. Dixon   +2 more
doaj   +1 more source

Self-assembly and two-dimensional spontaneous resolution of cyano-functionalized [7]helicenes on Cu111 [PDF]

, 2011
Birds of a feather flock together: STM and DFT studies provide the first example of spontaneous chiral resolution of a helicene on a surface. Racemic 6,13-dicyano[7]helicene forms fully segregated domains of pure enantiomers (2D conglomerate) on Cu(111).
Boz, Serpil, Diederich, François, Jung, Thomas A., Nguyen, Manh-Thuong, Passerone, Daniele, Pignedoli, Carlo A., Schweizer, W. Bernd, Schär, Michael, Stöhr, Meike, Thilgen, Carlo   +9 more
core   +1 more source

Hoch effiziente, präparative chromatographische Enantiomerentrennung von 2-Phenyl-1,3-dioxin-4-onen an Cellulose-triacetat und Cuprat-Additionen zu ?-Hydroxycarbonsäure-Derivaten

CHIMIA, 1991
The 2-Phenyl-dioxinones 1 and 2 are resolved on cellulose-triacetate columns (medium pressure, eluent MeOH, separation factors ? = 2.0–2.3, injection of g amounts).
Dieter Seebach, Urs Gysel, Joachim N. Kinkel   +2 more
doaj   +2 more sources

Diastereoselection:  Introduction [PDF]

Chemical Reviews, 1999
B W, Gung, B, le Noble
openaire   +2 more sources

Highly Efficient and Diastereoselective Synthesis of New Pyrazolylpyrrolizine and Pyrazolylpyrrolidine Derivates by a Three-Component Domino Process

Molecules, 2014
Diastereoselective reactions between 4-formylpyrazoles, N-substituted maleimides and glycine derivates led to new series of pyrazolyldipyrrolo [3,4-a:3',4'-f]pyrrolizines and pyrazolylpyrrolo[3,4-c]pyrroles in good yields.
Jairo Quiroga, Jaime Gálvez, Rodrigo Abonia, Braulio Insuasty, Alejandro Ortíz, Justo Cobo, Manuel Nogueras   +6 more
doaj   +1 more source

Transient [3,3] Cope rearrangement of 3,3-dicyano-1,5-dienes: computational analysis and 2-step synthesis of arylcycloheptanes. [PDF]

, 2018
A simple and modular route to arylcycloheptene scaffolds is reported. The two-step route from Knoevenagel adducts and allylic electrophiles is made possible through the design of a Cope rearrangement that utilizes a "traceless" activating group to ...
Fereyduni, Ehsan, Gonzalez, Gabriel, Grenning, Alexander J, Houk, KN, Sanders, Jacob N   +4 more
core   +1 more source

Formal Synthesis of (±)-Coriolin by Diastereocontrolled Nickel(0)-Catalyzed 'Metallo-ene-type' Cyclization/Methoxycarbonylation

CHIMIA, 1992
Bicyclooctanone (±)-2, an advanced intermediate for the synthesis of (±)-coriolin, has been synthesized in ten steps starting from 2,2-dimethylpent-4-enal (7). The key step 6 ?
Wolfgang Oppolzer, Akira Ando
doaj   +2 more sources