frontier in the development of chiral stationary phases for chromatographic enantioseparation involves homochiral metal–organic frameworks (MOFs). Using enantiopure (R)-2,2′-dihydroxy-1,1′-binaphthalene-6,6′-dicarboxylic acid as a starting material, we prepared three homochiral MOFs that were further used as chiral stationary phases for high-performanceliquidchromatography to separate the enantiomers
Catalytic, Enantioselective N-Acylation of Lactams and Thiolactams Using Amidine-Based Catalysts
作者:Xing Yang、Valentina D. Bumbu、Peng Liu、Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Wei Zhang、Xuntian Jiang、K. N. Houk、Vladimir B. Birman
DOI:10.1021/ja306766n
日期:2012.10.24
contrast to alcohols and amines, racemic lactams and thiolactams cannot be resolved directly via enzymatic acylation or classical resolution. Asymmetric N-acylation promoted by amidine-based catalysts, particularly Cl-PIQ 2 and BTM 3, provides a convenient method for the kinetic resolution of these valuable compounds and often achieves excellent levels of enantioselectivity in this process. Density
Site-selective enzymatic C‒H amidation for synthesis of diverse lactams
作者:Inha Cho、Zhi-Jun Jia、Frances H. Arnold
DOI:10.1126/science.aaw9068
日期:2019.5.10
rings of varying size (see the Perspective by Hepworth and Flitsch). The enzyme directs amidation to the desired position and simultaneously prevents other side reactions. Science, this issue p. 575; see also p. 529 Evolved enzymes selectively form β-, γ-, and δ-lactams from simple precursors. A major challenge in carbon‒hydrogen (C‒H) bond functionalization is to have the catalyst control precisely where
Two novel chiral coordination polymers were synthesized by treating C2-symmetric 2,2′-dihydroxy- and 2,2′-dimethoxy-1,1′-binaphthalene-3,3′-dicarboxylic acids with Cu2+, in which sorption of some chiral β-lactam compounds in the frameworks occurred enantioselectively.
Stereoselective construction of β-, γ- and δ-lactam rings via enzymatic C–H amidation
作者:Satyajit Roy、David A. Vargas、Pengchen Ma、Arkajyoti Sengupta、Ledong Zhu、K. N. Houk、Rudi Fasan
DOI:10.1038/s41929-023-01068-2
日期:——
are found in many biologically active natural products and pharmaceuticals, including important classes of antibiotics. Methods for the asymmetric synthesis of these molecules are therefore highly desirable, particularly through the selective functionalization of unreactive aliphatic C–H bonds. Here we show the development of a strategy for the asymmetric synthesis of β-, γ- and δ-lactams via the haemoprotein-catalysed