Small organic molecule catalyzed enantioselective direct aldol reaction in water
摘要:
Protonated pyrrolidine based small organic molecules have been designed and evaluated for the asymmetric direct aldol reaction in water. The designed organocatalysts are multifunctional in nature and exploit the combined effect of hydrogen bonding and hydrophobic interactions for enantioselective catalysis in water. As a result a unique direct asymmetric aldol reaction in water catalyzed by a small organic molecule having an amide linkage has been developed. The developed catalyst affords chiral beta-hydroxyketones in good yields (93%) and enantioselectivities (upto 62%) in water. (c) 2006 Elsevier Ltd. All rights reserved.
[EN] COMPOSITIONS AND METHODS FOR TREATING AND PREVENTING NEURODEGENERATIVE DISORDERS<br/>[FR] COMPOSITIONS ET MÉTHODES DE TRAITEMENT ET DE PRÉVENTION DE TROUBLES NEURODÉGÉNÉRATIFS
申请人:ALZHEON INC
公开号:WO2017027582A1
公开(公告)日:2017-02-16
Compounds, pharmaceutical compositions, methods and kits are described for treating or preventing neurodegenerative diseases such as Alzheimer's disease.
描述了用于治疗或预防阿尔茨海默病等神经退行性疾病的化合物、药物组合物、方法和试剂盒。
C2 symmetrical nickel complexes derived from α-amino amides as efficient catalysts for the enantioselective addition of dialkylzinc reagents to aldehydes
作者:Jorge Escorihuela、Belen Altava、M. Isabel Burguete、Santiago V. Luis
DOI:10.1016/j.tet.2012.11.025
日期:2013.1
amides were studied for the enantioselectiveaddition of dialkylzincreagents to aldehydes. Different structural elements on the ligands seem to play an important role in determining the observed enantioselectivity. Through optimization of structure and reaction conditions, the best ligand provided secondary alcohols in excellent yields (up to 98%) and enantioselectivity of up to 99% ee for (R)-enantiomer
Synthesis of Phosphoramides for the Lewis Base-Catalyzed Allylation and Aldol Addition Reactions
作者:Scott E. Denmark、Xiping Su、Yutaka Nishigaichi、Diane M. Coe、Ken-Tsung Wong、Stephen B. D. Winter、Jun Young Choi
DOI:10.1021/jo9820723
日期:1999.3.1
Both chiral and achiral phosphoramides of diverse structure were prepared from diamines by the coupling to phosphorus(V) or phosphorus(III) reagents. Several enantiopure 1,2-diphenyl-1,2-ethanediamine analogues have been prepared by the reductive coupling of the corresponding N-silylimine with NbCl(4)(THF)(2) and subsequent resolution by the formation of diastereomeric menthyl carbamates. (S,S)-N,
seven chiral azolinium and five functionalized chiral azolinium salts, precursors to N-heterocyclic carbenes, derived from l-proline has been developed. Moderate to good overall yields were obtained. Some NHC dimers and thiones were isolated. X-ray crystal structure determinations of two [Rh-NHC] complexes were also reported. A short and flexible procedure for the preparation of seven chiral azolinium
Rational Design of Simple Organocatalysts for the HSiCl3 Enantioselective Reduction of (E)-N-(1-Phenylethylidene)aniline
作者:María Maciá、Raúl Porcar、Vicente Martí-Centelles、Eduardo García-Verdugo、Maria Isabel Burguete、Santiago V. Luis
DOI:10.3390/molecules26226963
日期:——
well-known organocatalysts for the HSiCl3 reduction of imines; however, custom design of catalysts is based on trial-and-error experiments. In this work, we have used a combination of computational calculations and experimental work, including kinetic analyses, to properly understand this process and to design optimized catalysts for the benchmark (E)-N-(1-phenylethylidene)aniline. The best results have