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April

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The Fluorine-Iminium Ion Gauche Effect: Proof of Principle and Application to Asymmetric Organocatalysis.

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embarcadero rad studio xe6 crack The first publication from the new Gilmour group at ETH, Zurich. It describes the exploitation of the gauche effect when fluorine is positioned alpha to an electronegative atom. The effect is used to impart greater rigidity on an iminium ion involved in the organocatalytic assymmetric epoxidation of a,b-unsaturated aldehydes. The extra rigidity leads to higher ee's and the effect will surely have wider implications in the vast and active field of secondary amine organocatalysis.

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Cu(I)-Catalyzed C-H a-Amination of Aryl

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Tori's Paper

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I chose this paper because it demonstrated an interesting application of a bifunctional chiral phosphoric acid in enantioselective organocatalysis via hydrogen bonding.

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Versatile Pd(OTf)2·2H2O-Catalyzed ortho-Fluorination Using NMP as a Promote

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The authors have developed a new protocol for efficient ortho-fluorination using Pd(OTf)2 ·2H2O as the catalyst, N-fluoro-2,4,6- trimethylpyridinium triflate as the F+ source, and NMP as the crucial promoter. The triflamide directing group can be readily displaced bya wide range of heteroatom and carbon nucleophiles, thereby affording this fluorination protocol excellent versatility for synthetic applications.


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Ruthenium-Catalyzed Oxidation of Alcohols into Amides

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An intriguing paper which claims that NaH is an effective oxidation promoter. A series of benzylic alcohol oxidations are performed and the results seem surprising taking into account the usual reactivity of NaH. The authors claim that NaH is directly involved in the oxidation process and the fact that, NaH can be recovered at the end of the reaction, there is the suggestion that the reaction is catalytic. The article was picked up almost immediately on Paul Doherty's visual certexam manager 3.4.3 crack and has since become the most commented thread in the site's history. It's caused quite a stir. 

Tori's Paper

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Arkaitz Correa, Dr. and  Rubén Martín, Dr
 Angew.Chem.Int.Ed, 2009, 48, 2-6
An easy to read overview of key publications and recent developments in the metal-catalysed carboxylation of organometallic reagents

August

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Novel methodology for the formation of amide bonds under neutral conditions is described. Evidence is presented that the active acyl donors are thio FCMA intermediates, generated from the reactions of thioacids with isonitriles.

September

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Andy's paper

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Further investigations towards novel glycopeptide/-lactam heterodimers are reported. Employing a multivalent approach to drug discovery, vancomycin and cephalosporin synthons, 4, 2, 5 and 10, 18, 25 respectively, were chemically linked to yield heterodimer antibiotics. These novel compounds were designed to inhibit Grampositive bacterial cell wall biosynthesis by simultaneously targeting the principal cellular targets of both glycopeptides and -lactams. The positional attachment of both the vancomycin and the cephalosporin central cores has been explored and the SAR is reported. This novel class of bifunctional antibiotics 2836 all displayed remarkable potency against a wide range of Gram-positive organisms, including methicillin-resistant Staphylococcus aureus (MRSA). A subset of compounds, 29, 31 and 35 demonstrated excellent bactericidal activity against MRSA (ATCC 33591) and 31 and 35 also exhibited superb in vivo efficacy in a mouse model of MRSA infection. As a result of this work compound 35 was selected as a clinical candidate, TD-1792.

Bing Li's paper

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Xiao Fu, Wei-Tian Loh, Yan Zhang, Tao Chen, Dr., Ting Ma, Hongjun Liu, Jianmin Wang, Choon-Hong Tan, Prof.

crack dwf to dwg Guanidinium catalyst 1HBArF4 (ArF=3,5-CF3C6H3, Bn=benzyl, Ts=4-toluenesulfonyl) was obtained in a single step from a commercially available diamine. By using this catalyst an asymmetric phospha-Mannich reaction has been developed, involving secondary phosphine oxides and H-phosphinates as the P nucleophile. A series of enantiomerically enriched -amino phosphine oxides (2), -amino phosphinate, and H-phosphinates containing P-chiral center were prepared.

Yoyo's paper

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Renat Kadyrov, Dr., René M. Koenigs, Dipl.-Chem., Claus Brinkmann, Dipl.-Chem., David Voigtlaender, Dr., Magnus Rueping, Prof. Dr.
 
AbstractValuable vicinal 1,2-diols can be prepared with high enantioselectivity by the asymmetric ruthenium-catalyzed hydrogenation of aryl- and alkyl-substituted -hydroxy ketones (see scheme). The ligands, which are distinguished by their modular construction, display excellent enantioface differentiation


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Helena's paper

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Angew. Chem. Int. Ed., 2009, 48, 1-5
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amplitube irig crack Iridium is blind to C: Highly regio- and enantioselective, iridium-catalyzed N-allylations of indoles, which complement the more common reactivity of indoles as carbon nucleophiles, have been developed (see scheme). These reactions form highly enantioenriched N-allylindoles, which are readily transformed into enantioenriched 3-(1H-indol-1-yl)-N-methyl-3-aryl propan-1-amines, dihydropyrrolo[1,2-a]indoles, and indol-1-yl propanoic acids.

Vicky's Paper

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Comparison of two papers both of which give methods for the enantioselective boration of α,β-unsaturated carbonyl compounds. One paper studies cyclic compounds with the use of a copper catalyst, and the other acyclic compounds with a rhodium catalyst.


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Interesting synthesis of phenols from aryl iodides using a copper catalyst in comparison of the use of palladium catalysed conditions.

Yoyo's paper

gmax keygen cara ngecrack windows 8 Formal [4 + 2] Cycloaddition of Donor−Acceptor Cyclobutanes and Aldehydes: Stereoselective Access to Substituted Tetrahydropyrans
Andrew T. Parsons and Jeffrey S. Johnson
 
A highly diastereoselective synthesis of 2,6-cis-disubstituted tetrahydropyrans (THPs) via Lewis acid-catalyzed formal [4 + 2] cycloaddition of donor−acceptor cyclobutanes and aldehydes has been developed. THP products are formed in up to 96% yield and 99:1 diastereoselectivity. Aromatic, cinnamyl, and aliphatic aldehydes are competent dipolarophiles in this system. This methodology was extended to a [[2 + 2] + 2] cycloaddition of 4-methoxystyrene, dimethyl methylidene malonate, and an aldehyde to furnish THPs directly without prior isolation of the cyclobutane.
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Vicky's Paper

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Various pyridines and pyrazines can be efficiently accessed from simple acyclic precursors using an intramolecular hydroamination/isomerization/aromatization sequence (see scheme). p-Toluenesulfonic acid (2 mol %) is used to catalyze this novel alkyne annulation, in which the oxime group allows for a subsequent redox-neutral aromatization step to occur.


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Vicky's paper

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Operationally simple Au(I)-catalyzed intramolecular hydroarylation (IMHA) reactions of terminal alkynes that proceed in high yield and under very mild conditions are described. These processes involve low catalyst loadings, mild reaction temperatures, and short reaction times, require no cocatalysts or additives, and allow for the generation of a number of important heterocyclic motifs from readily accessible starting materials.

Yoyo's Paper

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by Khalid B. Selim, Dr., Yasumasa Matsumoto, Dr., Ken-ichi Yamada, Dr., Kiyoshi Tomioka, Prof. Dr.

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Tori's Paper

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An efficient procedure for radical cyclization of alpha-bromo esters is reported. Reduction of the esters by DIBAL-H at low temperature gives aluminum acetals, which are cyclized in the presence of nBu3SnH and Et3B (see scheme). These one-pot conditions lead to polysubstituted gamma-lactols in high yields, and the mildness of the reaction conditions allows the preparation of acid-sensitive derivatives.

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wintoflash 0.7.0048 keygen The authors of this paper report an elegant protocol of utilising a stable N-heterocyclic carbene (NHC) organocatalyst for activation and reduction of carbondioxide (CO2) to methanol under very mild conditions. In contrast to the traditional transition metal-catalysed methods, NHC organocatalyst exhibits excellent turnover number (TON) and turnover frequency (TOF) of 1840 and 25.5 h-1 respectively for conversion of CO2 to methanol at ambient conditions. 
The authors have taken substantial effort to identify the reaction intermediates involved in the catalytic cycle using sophisticated NMR spectroscopic experiments and have mapped the complete mechanism of the process. 
One of the drawbacks in this process is the utilisation of expensive hydrosilanes as reducing reagents.  However, the authors conclude in this paper that their ongoing research is focussed on using cheaper alternative hydride sources.  Nevertheless, this protocol offers remarkable scope for new discoveries in chemical CO2 activation and fixation under metal-free conditions along with a possible hope for cheaper production of sustainable form of fuel in the era of global warming. 

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Nickel-Catalyzed Regioselective Carbomagnesation of Methylenecyclopropanes through a Site-Selective Carbon–Carbon Bond Cleavage

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Rhenium- and Manganese-Catalyzed Synthesis of Aromatic Compounds from 1,3-Dicarbonyl Compounds and Alkynes

idm 6.18 build 12 full version with crack Takai et al. have succeeded in the development of three approaches to the synthesis of aromatic compounds from 1,3-dicarbonyl compounds and alkynes. The first approach is a manganese-catalyzed [2+2+2] cycloaddition between 1,3-dicarbonyl compounds, which have no substituents at the active methylene moiety, and terminal alkynes. This reaction proceeds with high regioselectivity when aryl acetylenes are employed as the alkyne component. The second approach is a rhenium- or manganese-catalyzed formal [2+1+2+1] cycloaddition between β-keto esters and two kinds of alkynes. In this reaction, the aromatic compounds are obtained by the following reaction sequence: (1) insertion of the first alkyne into a carbon−carbon single bond of a β-keto ester, (2) formation of 2-pyranones via intramolecular cyclization with the elimination of ethanol, and (3) Diels−Alder reaction between the formed 2-pyranone and the second alkyne. This reaction provides multisubstituted aromatic compounds in a regioselective manner. The third approach is a rhenium-catalyzed formal [2+2+1+1] cycloaddition reaction from two 1,3-diketones and one alkyne. In this reaction, the aromatic skeleton is constructed from three carbons of the first 1,3-diketone, two carbons of the alkyne, and one carbon of the second 1,3-diketone.
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