抽象的 丁酸支架是几种人类代谢产物的基础结构,这些代谢产物具有多种突出的生化作用,包括作为细胞能量的氧化源和生物合成的底物。通过结合氟使代谢物衍生化通常会改变生物活性,并且可以根据所采用的氟同位素,通过核磁共振或正电子发射断层显像法促进检测和分析。我们描述了两种新的氟化丁酸(和三种相关的酯)的合成,它们是代谢产物乙酰乙酸和3-羟基丁酸的衍生物。4-氟-3-羟基丁酸是由环氧酯前体经三乙胺三氟化氢通过开环制备的。2-氟乙酰乙酸是通过酸不稳定的β-酮酯的亲电氟化反应制得的。19 F NMR光谱。 丁酸支架是几种人类代谢产物的基础结构,这些代谢产物具有多种突出的生化作用,包括作为细胞能量的氧化源和生物合成的底物。通过结合氟使代谢物衍生化通常会改变生物活性,并且可以根据所采用的氟同位素,通过核磁共振或正电子发射断层显像法促进检测和分析。我们描述了两种新的氟化丁酸(和三种相关的酯)的合成,它们是代谢产
抽象的 丁酸支架是几种人类代谢产物的基础结构,这些代谢产物具有多种突出的生化作用,包括作为细胞能量的氧化源和生物合成的底物。通过结合氟使代谢物衍生化通常会改变生物活性,并且可以根据所采用的氟同位素,通过核磁共振或正电子发射断层显像法促进检测和分析。我们描述了两种新的氟化丁酸(和三种相关的酯)的合成,它们是代谢产物乙酰乙酸和3-羟基丁酸的衍生物。4-氟-3-羟基丁酸是由环氧酯前体经三乙胺三氟化氢通过开环制备的。2-氟乙酰乙酸是通过酸不稳定的β-酮酯的亲电氟化反应制得的。19 F NMR光谱。 丁酸支架是几种人类代谢产物的基础结构,这些代谢产物具有多种突出的生化作用,包括作为细胞能量的氧化源和生物合成的底物。通过结合氟使代谢物衍生化通常会改变生物活性,并且可以根据所采用的氟同位素,通过核磁共振或正电子发射断层显像法促进检测和分析。我们描述了两种新的氟化丁酸(和三种相关的酯)的合成,它们是代谢产
A new strategy for the synthesis of 3,5-disubstituted phenols is established through one-pot Robinson annulation of α,β-unsaturated ketones with α-fluoro-β-ketoesters followed by in situ dehydrofluorination and tautomerization. This method has been extended to the synthesis of polysubstituted phenols and applied in the preparation of biologically active compounds.
TiIV-Catalyzed Asymmetric Sulfenylation of 1,3-Dicarbonyl Compounds
作者:Marjan Jereb、Antonio Togni
DOI:10.1002/chem.200700920
日期:2007.11.16
The electrophilic enantioselective sulfenylation of 1,3-dicarbonylcompounds with phenylsulfenyl chloride is effectively catalyzed by [Ti(TADDOLato)] complexes. The corresponding products are obtained in moderate to high yields. The highest ee values (up to 97 %) are obtained in toluene at room temperature and with a typical catalyst loading of 5 mol %. Bulky ester groups and sterically undemanding
Primary-secondary diamines catalyzed Michael reaction to generate chiral fluorinated quaternary carbon centers
作者:Yingpeng Lu、Gang Zou、Gang Zhao
DOI:10.1016/j.tet.2015.04.103
日期:2015.6
Asymmetric Michaelreactions of α-fluoro-β-ketoesters to nitroolefins have been achieved by using readily accessible primary-secondary diamines as the organocatalysts through enamine activation mode, affording the useful Michael adducts bearing chiral fluorinated quaternary carbon in good yields, with high diastereoselectivities and enantioselectivities (up to 87% yield, >20:1 d.r. and 99% ee).
Enantioselective Alkylation of α-Fluoro-β-Keto Esters by Asymmetric Phase-Transfer Catalysis
作者:Keiji Maruoka、Changhua Ding
DOI:10.1055/s-0028-1087813
日期:2009.3
Highly enantioselective alkylation of tert-butyl α-fluoro-β-keto esters can be effected by the use of N-spiro chiral quaternary ammonium salt as chiral phase-transfer catalyst, as a complementary approach to the asymmetric fluorination of α-alkyl-β-keto esters.
Primary−secondarydiaminecatalysts were used to catalyze the asymmetric Robinson annulation to synthesize multiply substituted fluorinated chiral cyclohexenones with two contiguous stereogenic centers, one of which is a fluorinated quaternary chiral center, with excellent enantioselectivities and diastereoselectivities in moderate to good yields.