Trichloromethyl ketones: asymmetric transfer hydrogenation and subsequent Jocic-type reactions with amines
作者:Michael S. Perryman、Matthew E. Harris、Jade L. Foster、Anushka Joshi、Guy J. Clarkson、David J. Fox
DOI:10.1039/c3cc46070c
日期:——
Amino-amides are important pharmaceutical building-blocks. The enantioselective reduction of trichloromethyl ketones using ruthenium transfer hydrogenation catalysts is reported. The products react in a range of Jocic-type reactions to give enantiomerically enriched amino-amides.
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
Inhibitors of cysteine proteases and methods of use thereof
申请人:Pardes Biosciences, Inc.
公开号:US11124497B1
公开(公告)日:2021-09-21
The disclosure provides compounds with warheads and their use in treating medical diseases or disorders, such as viral infections. Pharmaceutical compositions and methods of making various compounds with warheads are provided. The compounds are contemplated to inhibit proteases, such as the 3C, CL- or 3CL-like protease. Exemplary compounds provided include Formula II-I, where R3, RB are provided herein:
B(C6F5)3-Catalyzed tandem cyclization/hydrosilylation for the step-economical construction of 1,2,3,4-tetrahydroquinoxalines from readily available starting materials has been developed.
An efficient and general protocol for copper-catalyzed N-arylation of aliphatic amines and amino acids has been developed using aryliodides under mild conditions (coupling temperature at 25-35 degrees C). For the N-(o-nitrophenyl) amino acid derivatives, subsequent reduction of the nitro group in the presence of tin(II) chloride resulted in 3,4-dihydroquinoxalin-2(1H)-one derivatives in good yields
使用芳基碘化物在温和条件下(偶联温度为 25-35 摄氏度)开发了一种用于铜催化脂肪胺和氨基酸 N-芳基化的高效通用方案。对于 N-(o-硝基苯基) 氨基酸衍生物,随后在氯化锡 (II) 存在下还原硝基会以良好的产率得到 3,4-二氢喹喔啉-2(1H)-one 衍生物。