نتایج جستجو برای: stereoselective

تعداد نتایج: 4707  

Journal: :Organic letters 2010
Roman Shchepin Chunping Xu Patrick Dussault

B(C(6)F(5))(3) promotes regio- and stereoselective cyclizations of unsaturated alkoxysilanes to generate oxasilinanes and oxasilepanes. The same products are available directly from alkenols via tandem silylation and hydrosilylation.

Journal: :Organic & biomolecular chemistry 2009
Ahmed M Zaed Michael D Swift Andrew Sutherland

A stereoselective synthesis of (+)-physoperuvine, a tropane alkaloid from Physalis peruviana Linne has been developed using a one-pot tandem aza-Claisen rearrangement and ring closing metathesis reaction to form the key amino-substituted cycloheptene ring.

Journal: :Chemical communications 2010
Daisuke Uraguchi Kyohei Koshimoto Takashi Ooi

A C(1)-symmetric chiral ammonium betaine has been developed, and its intramolecular ion-pairing structure in solid state and its catalytic performance to achieve the highly stereoselective Mannich-type reaction of 2-alkoxythiazol-5(4H)-ones are revealed.

Journal: :Chemical communications 2011
Hye Ryung Kim Jaesook Yun

Correction for 'Highly regio- and stereoselective synthesis of alkenylboronic esters by copper-catalyzed boron additions to disubstituted alkynes' by Hye Ryung Kim et al., Chem. Commun., 2011, 47, 2943-2945.

Journal: :Organic letters 2003
Luis Alvarez de Cienfuegos Concepción Rodríguez Antonio J Mota Rafael Robles

[reaction: see text] Cyclic 1,2-thiocarbonate sugars are convenient starting materials for the selective and efficient preparation of glycofuranosyl azides and nucleosides by regio- and stereoselective thiocarbonate ring-opening.

Journal: :Chemical communications 2001
K Nishide Y Hagimoto H Hasegawa M Shiro M Node

X-Ray crystallographic analyses of fluorocyanides anti-1 and 2 revealed a novel intramolecular through-space interaction between F and CN in an acyclic system, which was applied to a stereoselective protonation of acyclic fluorocyanides 2 having flexible conformation.

Journal: :Journal of the American Chemical Society 2010
Justin Kim Mohammad Movassaghi

A highly stereoselective and systematic strategy for the introduction of polysulfides in the synthesis of epipolythiodiketopiperazines is described. We report the first total synthesis of dimeric epitri- and epitetrathiodiketopiperazines.

Journal: :Organic letters 2007
Michael E Jung Dongwon Yoo

The combination of highly stereoselective non-aldol aldol and aldol processes allows the preparation of the completely protected C1-C12 fragment 2 of the novel macrocyclic cytotoxic agent tedanolide 1.

Journal: :Molecules 2011
Tomonori Ichibakase Masato Nakatsu Makoto Nakajima

Lithium diphenylbinaphtholate catalyzed the enantioselective Evans-Tishchenko reduction of achiral β-hydroxyketones to afford monoacyl-protected 1,3-diols with high stereoselectivities. In the reaction of racemic β-hydroxyketones, kinetic optical resolution occurred in a highly stereoselective manner.

Journal: :Molecules 2010
Gokce Goksu Nuket Ocal Dieter E Kaufmann

The palladium-catalyzed hydroarylation of N-methyl-substituted tricyclic imides was studied in order to find a new stereoselective access to a series of new exo-aryl(hetaryl)-substituted tricyclic N-methylimides.

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