Results 11 to 20 of about 17,659 (225)

Enantioselective Tsuji Allylations [PDF]

Chemistry – An Asian Journal, 2007
AbstractThe family of allylation reactions developed by Tsuji in the 1980s are capable of generating tertiary and quaternary carbon stereocenters from several synthetic precursors. Despite the utility of these transformations, they have seen little use in the synthesis of natural products.
Mohr, Justin T., Stoltz, Brian M.
openaire   +6 more sources

Total Synthesis of the Spirocyclic Bis-Indole Alkaloid (-)-Owerreine via a [4+2] Annulation. [PDF]

Angew Chem Int Ed Engl
The total synthesis of the bis‐indole alkaloid (−)‐owerreine has been accomplished by a diastereoselective [4+2] annulation between an enamine and an α,β−unsaturated indolenine precursor to form the 3‐spirocyclic tetrahydropyridine linkage of the natural product. DFT calculations allow an understanding of the mechanism of the key annulation.
Coll E, Gandon V, Kouklovsky C, Evanno L, Vincent G.   +4 more
europepmc   +3 more sources

Chemically modified polysulfones for molecular imprinting. Synthesis and complexation with a fluorescent model template [PDF]

, 2013
Polysulfone (PSU) was chemically modified to prepare new molecular imprinted membranes (MIMs). Several amounts of amine and sulfonyl groups were introduced into the PSU chemical structure in order to create interactions with acid or base templates, such ...
Fery-Forgues, Suzanne, Fournier-Noël, Clara, Kébir, Nasreddine, Lahitte, Jean-Francois, Remigy, Jean-Christophe, Sabathié, Nathalie   +5 more
core   +6 more sources

Reactive organoallyl species generated from aryl halides and allene: allylation of alpha,beta-unsaturated aldehydes and cyclic ketones employing Pd/In transmetallation processes [PDF]

, 2008
Allylation of α,β-unsaturated aldehydes and cyclic ketones promoted by Pd/In transmetallation processes has been studied. The unsaturated aldehydes underwent regioselective 1,2-addition to afford secondary homoally alcohols.
Anwar, Araki, Araki, Araki, Araki, Brase, Cacchi, Chan, Cleghorn, Cleghorn, Cooper, Cooper, Cooper, Denmark, Dupont, Fontana, Gai, Gomez, Grigg, Han, Hirashita, Hopkins, Howell, Kang, Kimura, Kless, Knodler, Larock, Laura A.T. Cleghorn, Law, Lee, Li, Littke, Liu, Marshall, Milena Simic, Miles, Miura, Miyabe, Nakahara, Norsikian, Ohno, Pardoe, Parrill, Podlech, Quan, Ronald Grigg, Sole, Tamaru, Tang, Tietze, Tsuji, Vladimir Savic, Wang, Zanoni, Zanoni, Zhou   +56 more
core   +2 more sources

Alkenylation and Allylation of Aldehydes by Using an Ni/Cr/TDAE Redox System [PDF]

, 2001
In 360 females, Bone mineral density (BMD) in lumbar vertebrae (L2-L4) was assessed by quantitative computed tomography (QCT), and the values obtained were compared with the frequency of vertebral transformation or fracture as assessed by lateral scan ...
Goto, Kentaro, Kishimoto, Suguru, Kuroboshi, Manabu, Tanaka, Hideo, Tanaka, Muneaki   +4 more
core   +1 more source

Highly Diastereo- and Enantioselective Allylboration of Aldehydes using alpha-Substituted Allyl/Crotyl Pinacol Boronic Esters via in Situ Generated Borinic Esters [PDF]

, 2013
Readily available, alpha-substituted allyl/crotyl pinacol boronic esters often give low E/Z selectivity (with Z favored) in reactions with aldehydes. We found that addition of nBuLi to the pinacol boronic ester followed by trapping of the alkoxide with ...
Althaus M., Andersen M. W., Batey R. A., Batey R. A., Beckmann E., Blais J., Brown H. C., Brown H. C., Brown H. C., Brown H. C., Bubnov Y. N., Carosi L., Carosi L., Chemler S. R., Chen M., Chen M., Christine L. Willis, Cmrecki V., Cole T. E., Denmark S. E., Fang G. Y., Flamme E. M., Gonzalez A. Z., Guzman-Martinez A., Hancock K. G., Helen K. Scott, Hesse M. J., Hoffmann R. W., Hoffmann R. W., Hoffmann R. W., Hoffmann R. W., Hoffmann R. W., Hoffmann R. W., Ito H., Jack L.-Y. Chen, Kennedy J. W. J., Kister J., Kliman L. T., Kramer G. W., Lachance H., Larouche-Gauthier R., Matteson D. S., Matthew J. Hesse, Midland M. M., Park J. K., Pelz N. F., Peng F., Peng F., Pietruszka J., Pietruszka J., Posseme F., Pulis A., Ramachandran P. V., Shiner C. S., Sonawane R. P., Stymiest J. L., Varinder K. Aggarwal, Webster M. P., Woodward A. R., Yamamoto Y., Zschage O.   +60 more
core   +2 more sources

Palladium-catalyzed heteroallylation of unactivated alkenes – synthesis of citalopram [PDF]

, 2013
A palladium-catalyzed difunctionalization of unactivated alkenes with tethered nucleophiles is reported. The versatile reaction occurs with simple allylic halides and can be carried out under air.
Adams, Alcaide, Alexanian, Arai, Balme, Beccalli, Byers, Carruthers, Danishefsky, Deprez, Desai, Doroski, Fries, Fries, Fukuda, Giese, Guo, Hayashi, Hayashi, Heck, Hegedus, Hickman, Hopkins, Ingalls, Jensen, Kang, Keller, Kimura, Koester, Komeyama, Kumar, Larock, Larock, Le Bras, Lei, Li, Lira, Liskin, Liu, Liwosz, Lovering, Lu, Ma, Ma, Ma, Ma, Mai, Manzoni, McDonald, Michael, Minatti, Muñiz, Muñiz, Muñiz, Nadin, Neukom, Newman, Newman, Ney, Ney, Nicolai, Nicolai, Nicolai, Nicolai, Nishimura, Pappo, Ritchie, Rosewall, Schuch, Schultz, Sehnal, Semmelhack, Sibbald, Sibbald, Streuff, Sun, Tietze, Tietze, Trost, Trost, Trost, Tsuji, VanRheenen, Vedantham, Wakabayashi, Weaver, Wolfe, Wolfe, Wolfe, Wolfe, Wu, Xu, Yip, Yip, Yorimitsu, Yorimitsu, Zeni, Zhao, Zhu   +98 more
core   +1 more source

Triflimide-catalyzed allyl–allyl cross-coupling: a metal-free allylic alkylation

Chemical Communications, 2012
A highly efficient metal-free intermolecular C(sp3)-C(sp3) allyl-allyl cross-coupling protocol between allyl acetates and allyltrimethylsilanes, which proceeded smoothly in the presence of catalytic triflimide to form 1,5-dienes with good to excellent regioselectivity, has been developed.
Ding, Feiqing, William, Ronny, Wang, Fei, Liu, Xue-Wei   +3 more
openaire   +3 more sources

Lewis acid catalyzed transfer hydromethallylation for the construction of quaternary carbon centers [PDF]

, 2019
The design and gram‐scale synthesis of a cyclohexa‐1,4‐diene‐based surrogate of isobutene gas is reported. Using the highly electron‐deficient Lewis acid B(C6F5)3, application of this surrogate in the hydromethallylation of electron‐rich styrene ...
Oestreich, Martin, Walker, Johannes C. L.   +1 more
core   +1 more source

Rapid syntheses of difluorinated dihydropyrans [PDF]

, 2000
A very short reaction sequence opens with metal-mediated addition of commercial bromodifluoropropene to aldehydes; allylation under phase transfer catalysed conditions sets the stage for a ring closing metathesis (RCM) in the presence of commercial ...
Percy, Jonathan, Pintat, Stephane
core   +1 more source