从合成12 g原理样品到超过900 kg cGMP的生产过程,描述了(S)-N -Boc-双(4-氟苯基)丙氨酸的合成方法,该合成方法是合成denagliptin的中间体。通过空间拥挤的前体2-乙酰氨基-3,3-双(4-氟苯基)丙烯酸乙酯的不对称氢化来建立手性中心。以物理形式分离各种中间体的能力很容易进行过滤,洗涤和最终纯化,这为成功的制造活动奠定了基础。
Room-Temperature Photochemical Copper-Mediated Fluorination of Aryl Iodides
作者:Taylor E. Spiller、Karsten Donabauer、Allen F. Brooks、Jason A. Witek、Gregory D. Bowden、Peter J. H. Scott、Melanie S. Sanford
DOI:10.1021/acs.orglett.4c02227
日期:2024.8.2
This report describes a method for the photochemical Cu-mediated fluorination of aryl iodides with AgF via putative aryl radical (Ar•) intermediates. It involves irradiating an aryl iodide with UVB light (λmax = 313 nm) in the presence of a mixture of CuI and CuII salts and AgF. Under these conditions, fluorination proceeds at room temperature for substrates containing diverse substituents, including
该报告描述了一种通过假定的芳基自由基 (Ar•) 中间体用 AgF 进行光化学 Cu 介导的芳基碘化物氟化的方法。它涉及在 Cu I和 Cu II盐以及 AgF 的混合物存在下用 UVB 光(λ max = 313 nm)照射芳基碘化物。在这些条件下,对于含有不同取代基(包括烷氧基和烷基、酮、酯、磺酸酯、磺酰胺和受保护的胺)的底物,在室温下进行氟化。该方法已转化为使用 K 18 F、K 3 PO 4和 AgOTf 的组合的放射性氟化。
Resolution of N-protected amino acid esters using whole cells of Candida parapsilosis ATCC 7330
作者:Selvaraj Stella、Anju Chadha
DOI:10.1016/j.tetasy.2010.02.011
日期:2010.3
Whole cells of Candida parapsilosis ATCC 7330 were used for the resolution of N-acetyl amino acid esters. Excellent enantioselectivities (E = 40 to >500) were achieved for the resolution of N-protected protein and non-protein amino acid esters giving good yields (28-50%) and high enantiomeric excesses (up to >99%) for both enantiomers. (C) 2010 Elsevier Ltd. All rights reserved.
Biocatalytical transformations II. Enantioselective hydrolysis of N-acetyl-fluoro-phenylalanine-ethylesters by lyophilised yeast