نتایج جستجو برای: stereoselective
تعداد نتایج: 4707 فیلتر نتایج به سال:
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.
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.
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.
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.
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.
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...
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)-(+)-...
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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