Dehydrierung cyclischer tertiärer Amine unter Reaktionsbeteiligung von enantiomeren nucleophilen Nachbargruppen / Dehydrogenation of Cyclic Tertiary Amines with Neighbouring of Enantiomeric Nucleophiles
Enantioselective conjugate addition to cyclic enones with scalemic lithium organo(amido)cuprates, Part IV. Relationship between ligand structure and enantioselectivity
作者:Bryant E. Rossiter、Masakatsu Eguchi、Guobin Miao、Nicole M. Swingle、Amelia E. Hernández、Denise Vickers、Ezdan Fluckiger、R. Greg Patterson、K. Vásavi Reddy
DOI:10.1016/s0040-4020(01)86278-5
日期:1993.1
Scalemic lithium amides derived from primary and secondary amines react with organocopper compounds in ether or dimethyl sulfide to form lithium organo(amido)cuprates capable of enantioselective conjugate addition to 2-cycloalkenones. The most successful heterocuprate, in which the chiral ligand is (S)-N-methyl-1-phenyl-2-(1-piperidinyl)ethanamine, (S)-MAPP, 13, reacts with cyclic enones to form products
Enantioselective Synthesis of Quaternary α-Amino Acids via <scp>l</scp>-<i>tert</i>-Leucine-Derived Squaramide-Catalyzed Conjugate Addition of α-Nitrocarboxylates to Enones
作者:Kalisankar Bera、Nishikant S. Satam、Irishi N. N. Namboothiri
DOI:10.1021/acs.joc.6b00543
日期:2016.7.1
Enantioselective Michael addition of tertiary α-nitroesters to β-unsubstituted vinyl ketones has been carried out in the presence of an l-tert-leucine-derived squaramide as organocatalyst. The products, quaternary α-nitroesters, were formed in excellent yield and moderate to good ee’s in most cases. Scale-up of the reaction and synthetic applications of the products, including transformation to representative
Enantioselective conjugate addition of pyrazolones to nitroalkenes catalyzed by chiral squaramide organocatalyst
作者:Alime Ebru Aydin、Selda Culha
DOI:10.1002/chir.23295
日期:2021.3
squaramide catalysts (8–15) were synthesized, and their catalytic efficiency in the enantioselectiveconjugateaddition of pyrazolones to nitroalkenes was described. This protocol provides excellent chemical yields (up to 93%) of chiral 5‐methyl‐4‐(2‐nitro‐1‐arylethyl)pyrazol‐3‐ol derivatives with high enantioselectivities (up to 97% ee).
[EN] 4- BROMO - 5 - (2- CHLORO - BENZOYLAMINO) - 1H - PYRAZOLE - 3 - CARBOXYLIC ACID AMIDE DERIVATIVES AND RELATED COMPOUNDS AS BRADYKININ B1 RECEPTOR ANTAGONISTS FOR THE TREATMENT OF INFLAMMATORY DISEASES<br/>[FR] DERIVES AMIDES DE L'ACIDE CARBOXYLIQUE DE 4- BROMO - 5 - (2- CHLORO - BENZOYLAMINO) - 1H - PYRAZOLE 3 ET COMPOSES ASSOCIES EN TANT QU'ANTAGONISTES DE RECEPTEUR DE B1 DE LA BRADYKININE POUR LE TRAITEMENT DE MALADIES INFLAMMATOIRES
申请人:ELAN PHARM INC
公开号:WO2004098589A1
公开(公告)日:2004-11-18
Disclosed are compounds of formula I and II that are bradykinin B1 receptor antagonists and are useful for treating diseases, or relieving adverse symptoms associated with disease conditions, in mammals mediated by bradykinin B1 receptor. Certain of the compounds exhibit increased potency and are also expected to exhibit increased duration of action.
Heterocyclic Lithium Amides as Chiral Ligands for an Enantioselective Hydroxyalkylation with <i>n</i>-BuLi
作者:Nicolas Duguet、Sylvain M. Petit、Philippe Marchand、Anne Harrison-Marchand、Jacques Maddaluno
DOI:10.1021/jo8005396
日期:2008.7.1
Chiralheterocyclic structures based on 3-aminopyrrolidines (3APs), 3-aminotetrahydrothiophens (3ATTs), and 3-aminotetrahydrofurans (3ATFs) have been synthesized. The corresponding lithium amides have been evaluated as chiralligands in the condensation of n-BuLi on o-tolualdehyde. The returned levels of induction were in the 46−80% ee range. The cheap and easily prepared 3ATFLi’s turned out to be