Results 211 to 220 of about 19,176 (260)
Inverting the Diastereoselectivity of the Mukaiyama–Michael Addition with Graphite-Based Catalysts
ACS Catalysis, 2014 Here, we show that graphite-based catalysts, mainly graphite oxide (GO) and exfoliated GO, are effective recyclable catalysts for a relevant stereoselective Mukaiyama− Michael addition, outperforming currently available catalysts.
Maria Rosaria Acocella +2 more
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Photoinduced Diastereoselective Aminoalkylation of Cubanes
Organic Letters, 2023The unique properties of rigid, nonconjugated hydrocarbons provide many opportunities to design molecular building blocks for a variety of applications, but the development of suitable conditions for alkylation of cubanes is quite challenging. Herein, a photoinduced method for aminoalkylation of cubanes is reported. The benign conditions reported allow
Guillaume Levitre +2 more
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Diastereoselective Total Synthesis of Raputindole A
Organic Letters, 2018The first diastereoselective total synthesis of the bisindole alkaloid raputindole A is reported. After Au(I)-catalyzed assembly of the cyclopenta[ f]indole tricycle, it was possible to hydrogenate the indene double bond regio- and diastereoselectively through iridium catalysis, guided by a preinstalled hydroxy function.
Mario Kock, Thomas Lindel
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Diastereoselective Alkylations of a Protected Cysteinesulfenate
The Journal of Organic Chemistry, 2009To further understand stereoselection in the alkylation of sulfenate anions, a protected cysteinesulfenate was generated in THF solution at low temperature. Introduction of a reactive alkylating agent brings about a cysteinyl sulfoxide in 51-75% yield, with diastereomeric ratios at the sulfinyl group ranging from 83:17 to 95:5.
Adrian L, Schwan +4 more
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Diastereoselective epoxidation of dipeptide olefins
Tetrahedron Letters, 1993Abstract m-Chloroperbenzoic acid (MCPBA) epoxidation of dipeptide olefins proceeds in high syndiastereoselectivity (38:1–300:1). This is partially caused by conformational constants introduce by the side chain that orients the allylic NH in a favorable position for hydrogen bonding to MCPBA.
S. ROMEO, D. RICH
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Cyclohexylcarbonitriles: Diastereoselective Arylations with TMPZnCl·LiCl
The Journal of Organic Chemistry, 2012Deprotonating substituted cyclohexanecarbonitriles with TMPZnCl·LiCl affords zincated nitriles that diastereoselectively couple with aryl bromides in the presence of catalytic Pd(OAc)(2) and S-Phos. Steric and electronic effects influence the diastereoselectivity; 4-t-butyl-, 4-TBSO-, and 2-Me-cyclohexanecarbonitriles exert virtually complete ...
Robert J, Mycka +5 more
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Diastereoselective Total Synthesis of (−)-Galiellalactone
The Journal of Organic Chemistry, 2015An enantioselective total synthesis of (-)-galiellalactone has been accomplished. The key features of the synthesis involve the highly stereoselective construction of the cis-trisubstituted cyclopentane intermediate by a Pd(0)-catalyzed cyclization, the stereospecific introduction of an angular hydroxyl group by Riley oxidation, and the efficient ...
Taewoo, Kim +5 more
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Diastereoselective Preparation of Azetidines and Pyrrolidines
Organic Letters, 2010Iodine-mediated cyclization of homoallyl amines at room temperature delivered cis-2,4-azetidine through a 4-exo trig cyclization. Isomerization of iodo-azetidines to cis-pyrrolidines could be achieved by heating, with complete stereocontrol. The relative stereochemistry of the iodo-azetidines and pyrrolidines was confirmed by NMR spectroscopy and X-ray
Antonio, Feula +2 more
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Diastereoselective Hydroboration of Isopropenylcyclopropanes
The Journal of Organic Chemistry, 1999Janine, Cossy +3 more
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Diastereoselection through chiral conformations.
Enantiomer, 2000Chiral conformations of flexible molecules may develop in a concerted manner if the molecule is crowded enough to assure sufficient level of through-the-space contacts. Higher number (> 4) of groups connected to the same atom, as in many coordination compounds, can be advantageous in this respect.
M. Szabo +6 more
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