[EN] COMPOSITIONS AND METHODS FOR PHOSPHORAMIDITE AND OLIGONUCLEOTIDE SYNTHESIS [FR] COMPOSITIONS ET PROCÉDÉS DE SYNTHÈSE DE PHOSPHORAMIDITES ET D'OLIGONUCLÉOTIDES
Enantioselective Catalytic Borane Reduction of Prochiral Ketones: Synthesis and Application of New Rigid β-Amino Alcohols with a Cycloalkanol Subunit
摘要:
Enantiocontrolled reduction of prochiral ketones with borane in the presence of new enantiomerically pure bi- and tricyclic beta-sec-amino alcohols 2-5 as stereodifferentiating catalysts afforded the optically active corresponding secondary alcohols in moderate to excellent (up to 98 % op) optical yields.
[EN] TECHNOLOGIES USEFUL FOR OLIGONUCLEOTIDE PREPARATION<br/>[FR] TECHNOLOGIES UTILES POUR LA PRÉPARATION D'OLIGONUCLÉOTIDES
申请人:WAVE LIFE SCIENCES LTD
公开号:WO2020191252A1
公开(公告)日:2020-09-24
Among other things, the present disclosure provides technologies for oligonucleotide preparation, particularly chirally controlled oligonucleotide preparation, which technologies provide greatly improved crude purity and yield, and significantly reduce manufacturing costs.
New chiral oxazaphospholidine oxides as highly efficient catalysts in the enantioselective reduction of ketones
作者:Viola Peper、Jürgen Martens
DOI:10.1016/0040-4039(96)01928-4
日期:1996.11
New catalysts 4–10 for the asymmetric reduction of the two model ketones 13 and 14 by borane are described. These catalysts are easily prepared by reaction of the corresponding β-amino alcohols with phenylphosphonic dichloride or alternatively by oxidation of the chiral 1,3,2-oxazaphospholidines. Enantiomeric excesses of 96% in the case of the ω-chloroacetophenone have been obtained using only 1 mol%
The chiral new aminophosphine-phosphinites (AMPP's 1-7) have been synthesized and applied successfully in the enantioselective hydrogenation of dihydro-4,4-dimethyl-2,3-furandione 8, N-benzylbenzoylformamide 9, and ethylpyruvate 10 providing the hydroxy products in up to 97, 95, and 80% ee, respectively.
Enantioselective reduction of aromatic ketones catalysed by chiral ruthenium(II) complexes
作者:M Aitali、S Allaoud、A Karim、C Meliet、A Mortreux
DOI:10.1016/s0957-4166(00)00055-0
日期:2000.4
The catalytic enantioselectivereduction of aromaticketones in 2-propanol is carried out by using ruthenium(II) complexes prepared from [Ru(p-cymene)Cl2]2 and a variety of chiral diamines and β-aminoalcohols derived from α-amino acids. Good conversions (>99%) and enantioselectivities (=96%) are observed under mild reaction conditions.
Enantioselective reduction of ketones with borane catalyzed by cyclic β- amino alcohols prepared from proline
作者:Ayhan S Demir、Idris Mecitoglu、Cihangir Tanyeli、Volkan Gülbeyaz
DOI:10.1016/s0957-4166(96)00443-0
日期:1996.12
New catalysts have been prepared from (S)- and (R)- proline and the asymmetric borane reduction of prochiral ketones using these catalysts has been studied. The secondary alcohols were obtained in 76-95% yield with 57-96% enantiomeric excesses. Copyright (C) 1996 Elsevier Science Ltd