Halogenative Deoxygenation of Ketones; Vinyl Bromides and/orgem-Dibromides by Cleavage of 1,3-Benzodioxoles (Ketone Phenylene Acetals) with Boron Tribromide
Structural Probing of Ketone Catalysts for Asymmetric Epoxidation
摘要:
A series of chiral ketones derived from carbohydrates were investigated as catalysts for the asymmetric epoxidation. Fructose-derived ketones are found to be efficient catalysts. The studies show that the structural requirements for the ketone catalysts are very stringent and different types of olefins may require ketones with different structural arrangements. The current study allows us to further understand the chiral ketone catalyzed asymmetric epoxidation and provides some insight for the development of new catalysts.
SUBSTITUTED NUCLEOSIDES, NUCLEOTIDES AND ANALOGS THEREOF
申请人:Alios BioPharma, Inc.
公开号:US20150105341A1
公开(公告)日:2015-04-16
Disclosed herein are nucleosides, nucleotides and nucleotide analogs, methods of synthesizing the same and methods of treating diseases and/or conditions such as a Picornavirus and/or Flaviviridae infection with one or more nucleosides, nucleotides and nucleotide analogs.
A compound and method for producing an enantiomerically enriched epoxide from an olefin using a chiral ketone and an oxidizing agent is disclosed.
一种化合物及其生产方法被披露,该方法使用手性酮和氧化剂从烯烃生产具有对映体富集的环氧乙烷。
Total Synthesis of the Proposed Structure of Brevenal
作者:Haruhiko Fuwa、Makoto Ebine、Makoto Sasaki
DOI:10.1021/ja062524q
日期:2006.8.1
Totalsynthesis of the proposed structure of brevenal, a natural marine polycyclic ether product, has been accomplished. The synthesis features (i) convergent synthesis of the pentacyclic polyether skeleton using our developed Suzuki-Miyaura coupling strategy and (ii) construction of the multi-substituted dienal side chain by CuTC-mediated Stille reaction. Comparison of the NMR data of the synthetic
Synthesis and Anti-HCV Activities of 4′-Fluoro-2′-Substituted Uridine Triphosphates and Nucleotide Prodrugs: Discovery of 4′-Fluoro-2′-<i>C</i>-methyluridine 5′-Phosphoramidate Prodrug (<b>AL-335</b>) for the Treatment of Hepatitis C Infection
We report the synthesis and biological evaluation of a series of 4'-fluoro-2'- C-substituted uridines. Triphosphates of the uridine analogues exhibited a potent inhibition of hepatitis C virus (HCV) NS5B polymerase with IC50 values as low as 27 nM. In an HCV subgenomic replicon assay, the phosphoramidate prodrugs of these uridine analogues demonstrated a very potent activity with EC50 values as low
An enantioselective, stereocontrolled total synthesis of eunicenone A (1) is described starting from geranylgeranylacetylene (9) in 14 steps via intermediates 10-20. The most critical construction in the synthesis is the highly effective Diels-Alder combination of the achiral components 2-bromoacrolein and diene 13 in the presence of the chiral Lewis acid catalyst 14 to form 15 (85% yield, 97% ee,