Compounds and compositions are provided for treatment, prevention, or amelioration of a variety of medical disorders associated with viral infections and/or cell proliferation. The compounds provided herein are nucleoside phosphonates and esters thereof.
Asymmetric Photodeconjugation: Highly Stereoselective Synthesis of α-Fluorocarboxylic Derivatives
作者:Frédéric Bargiggia、Sylvia Dos Santos、Olivier Piva
DOI:10.1055/s-2002-20028
日期:——
Irradiations of α-fluoro-α,β-unsaturated esters lead to the corresponding α-fluoro-β,γ-unsaturated isomers in good yields. The reaction required the use of an achiral base (typically an amine) to promote the protonation of the photodienolic intermediate. By replacing the ethyl group with a diacetone-d-glucose moiety, the reaction can be carried out in a diastereoselective manner to furnish the deconjugated esters with similar yields and selectivities up to 95%. The adducts were submitted to osmylation conditions to deliver α-fluoro-β-hydroxy-butyrolactones in one single step.
Synthesis of fluorinatedanalogs of some dienic insect sex pherormones through a stereocontrolled Wittig reaction of β-fluorinated aldehydes with the appropriate ω-functionalized ylides is reported. Some features of the 1H and 19F NMR spectra of these analogs are also discussed.
据报道,通过β-氟化醛与适当的ω-官能化的乙炔的立体控制的Wittig反应,合成了一些二齿昆虫性信息素的氟化类似物。还讨论了这些类似物的1 H和19 F NMR光谱的某些特征。