نتایج جستجو برای: stereoselective

تعداد نتایج: 4707  

Journal: :Journal of the American Chemical Society 2009
Jessica Y Wu Benoît Moreau Tobias Ritter

A chemo-, regio-, and stereoselective iron-catalyzed 1,4-hydroboration of dienes that affords gamma-disubstituted allylboranes has been developed. 1,4-Hydroboration of 2-substituted dienes forms allylborane products with (E)-trisubstituted double bonds exclusively.

2016
Michael Brown Ravi Kumar Julia Rehbein Thomas Wirth

A stereoselective hypervalent iodine-promoted oxidative rearrangement of 1,1-disubstituted alkenes has been developed. This practically simple protocol provides access to enantioenriched α-arylated ketones without the use of transition metals from readily accessible alkenes.

2015
Justyna Szudkowska-Frątczak Mariusz Taczała Piotr Pawluć

A convenient methodology for the highly stereoselective synthesis of unsymmetrical (1E,3E)-1,4-disubstituted 1,3-dienes based on palladium-catalyzed Hiyama cross-coupling reaction of 1-(triethoxysilyl)-substituted buta-1,3-dienes with aryl iodides is reported.

Journal: :Chemical communications 2011
Ben J Jeffery Emma L Whitelaw Daniel Garcia-Vivo Joseph A Stewart Mary F Mahon Matthew G Davidson Matthew D Jones

In this paper we demonstrate the utility of Group 4 metals for the well-controlled and stereoselective (syndiotactic) ring opening polymerization (ROP) of rac-β-butyrolactone (BBL) and their ability to form copolymers.

Journal: :Organic & biomolecular chemistry 2014
Avanashiappan Nandakumar Selvarangam E Kiruthika Kanagaraj Naveen Paramasivan Thirumalai Perumal

Palladium-catalyzed highly regio- and stereoselective 6-exo-dig and 7-endo-dig cyclization of functionalized propargylic compounds has been developed for the synthesis of (E)-4-(isobenzofuran-1(3H)-ylidene)-1,2,3,4-tetrahydroisoquinolines and aze/oxepinoindoles.

Journal: :Journal of the Serbian Chemical Society 2020

Journal: :Journal of the American Chemical Society 1982

1997
Jin Soon Cha Suk Joung Moon Oh Oun Kwon Yong Rok Lee

Aluminum hydride, a very interesting and valuable reducing agent, has been widely used in numerous applications in organic syntheses. Jorgenson first reported the comparison in the reducing properties between lithium aluminum hydride and aluminum hydride on the reduction of cinnamaldehyde, and Brown and Yoon reported a systematic study on the reducing properties of aluminum hydride in THF. Fina...

Journal: :Molecular pharmacology 1998
M Longobardo E Delpón R Caballero J Tamargo C Valenzuela

Block of hKv1.5 channels by bupivacaine is stereoselective, with (R)-(+)-bupivacaine being 7-fold more potent than (S)-(-)-bupivacaine. The study of the effects of chemically related enantiomers on these channels may help to elucidate the structural determinants of stereoselective hKv1.5 channels block by local anesthetics. In this study, we analyzed the effects of (R)-(+)-ropivacaine, (R)-(+)-...

Journal: :Drug metabolism and disposition: the biological fate of chemicals 2008
Meng Huang Lin Tang Goh Paul C Ho

N-methylisoindigotin, abbreviated as meisoindigo, has been a routine therapeutic agent in the clinical treatment of chronic myelogenous leukemia in China since the 1980s. However, information relevant to in vitro metabolism of meisoindigo is limited. In this study, in vitro stereoisomeric metabolites of meisoindigo in rat liver microsomes were identified for the first time by achiral and chiral...

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