In stereochemistry, a chiral auxiliary is a stereogenic group or unit that is temporarily incorporated into an organic compound in order to control the...
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Aldol reaction (redirect from Evans auxiliary)
temporarily appending a chiral oxazolidinone auxiliary to create a chiral enolate. The pre-existing chirality from the auxiliary is then transferred to...
38 KB (4,019 words) - 12:38, 16 November 2024
Enantioselective synthesis (redirect from Chiral ligand)
BINAP/diamine-Ru, widens the scope to α,β-alkenes and aromatic chemicals. A chiral auxiliary is an organic compound which couples to the starting material to form...
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chemistry, a chiral derivatizing agent (CDA), also known as a chiral resolving reagent, is a derivatization reagent that is a chiral auxiliary used to convert...
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Enantiomer (redirect from Chiral amplification)
encompassed include the use of chiral starting materials (chiral pool synthesis), the use of chiral auxiliaries and chiral catalysts, and the application...
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Baylis–Hillman reaction (section Chiral auxiliaries)
before aza-MBH ring closure catalyzed by a chiral amine base. Oppolzer's sultam can be used as a chiral auxiliary for an asymmetric MBH reaction. When an...
24 KB (2,824 words) - 23:32, 20 November 2024
Asymmetric induction (redirect from Chiral induction)
called chiral auxiliaries. In external asymmetric induction chiral information is introduced in the transition state through a catalyst of chiral ligand...
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Roskamp reaction (section Chiral Auxiliary)
reaction. The chiral information is introduced by chiral auxiliaries from the diazo compound. In 2010, the Feng group developed a chiral Sc-catalyzed enantioselective...
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commercially available and are used in asymmetric synthesis as chiral auxiliaries, often as chiral ammonia equivalents for the synthesis of amines. tert-Butanesulfinamide...
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carbon-carbon bond formation reaction facilitated by pyrrolidine chiral auxiliaries. It was pioneered by E. J. Corey and Dieter Enders in 1976, and was...
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performed in the presence of a chiral auxiliary. The selection of dihydroquinidine (DHQD) or dihydroquinine (DHQ) as a chiral auxiliary dictates the facial selectivity...
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replacing ammonia with (S)-alpha-phenylethylamine as chiral auxiliary the ultimate reaction product was chiral alanine. Catalytic asymmetric Strecker reaction...
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followed by chiral chromatographic separation of the enantiomers. An early enantioselective route to atorvastatin made use of an ester chiral auxiliary to set...
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Acetal (section Chiral derivatives)
of modified sugars. Acetals also find application as chiral auxiliaries. Indeed acetals of chiral glycols like, e.g. derivatives of tartaric acid can be...
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placement of a chiral auxiliary on the starting material whose configuration is unaffected by the reaction, and the use of a chiral base. The relative...
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alkylated by alkyl halides. The hydrazines SAMP and RAMP function as chiral auxiliary. Several methods are known to recover carbonyl compounds from N,N-dialkylhydrazones...
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(RAMP), a class of protein (R)-1-amino-2-methoxymethylpyrrolidine, a chiral auxiliary used in the Enders SAMP/RAMP hydrazone-alkylation reaction Airport...
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by use of a chiral auxiliary, and the Nazarov reaction has been performed catalytically using chiral Lewis acids, Brønsted acids and chiral amines. IUPAC...
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The chiral pool is a "collection of abundant enantiopure building blocks provided by nature" used in synthesis. In other words, a chiral pool would be...
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known as bornanesultam, is a crystalline solid primarily used as a chiral auxiliary in the synthesis of other chemicals with a specific desired stereoselectivity...
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process is that D-menthol becomes inexpensively available for use as a chiral auxiliary, along with the more usual L-antipode. Menthol is included in many...
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as a chiral auxiliary in organic synthesis. The related sulfinamides (R(S=O)NHR) are amides of sulfinic acids (R(S=O)OH) (see sulfinyl). Chiral sulfinamides...
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that end, several variations have been developed utilizing chiral auxiliaries and chiral catalysts. Diastereoselective cyclizations are also known, in...
25 KB (2,696 words) - 17:44, 11 September 2024
is used in broad variety of chemical reactions as chiral ligand, chiral catalyst or chiral auxiliary reagent in the Hajos–Parrish–Eder–Sauer–Wiechert reaction...
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synthesis of chiral amino acids. The method was established in 1981 by Ulrich Schöllkopf. In it glycine is a substrate, valine a chiral auxiliary and the reaction...
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to provide the crucial chiral environment. The strategy is to make these variables to interact with a chiral auxiliary (chiral selector, CS) whereby it...
63 KB (6,792 words) - 22:07, 2 December 2023
directed towards anthracyclinone syntheses: The use of d-glucose as a chiral auxiliary in asymmetric Diels–Alder reactions". J. Saudi Chem. Soc. 17: 29–42...
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organic synthesis is an illustration of asymmetric synthesis via a chiral auxiliary. The reaction centers around an imine - lithium enolate cycloaddition...
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situ from K2OsO2(OH)4 (an Os(VI) species) due to safety concerns. Chiral Auxiliary: This is usually some kind of cinchona alkaloid. Stoichiometric Oxidant:...
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In chemical synthesis, ephedrine is used in bulk quantities as a chiral auxiliary group. In saquinavir synthesis, the half-acid is resolved as its salt...
66 KB (6,171 words) - 19:40, 17 November 2024