Amino-5-[4-(difluoromehtoxy)phenyl]-5-phenylimidazolone compounds for the inhibition of beta-secretase
申请人:Malamas Sotirios Michael
公开号:US20070072925A1
公开(公告)日:2007-03-29
The present invention provides a 2-amino-5-[4-(difluoromethoxy)phenyl]-5-phenylimidazolone compound of formula I
The present invention also provides methods for the use thereof to inhibit β-secretase (BACE) and treat β-amyloid deposits and neurofibrillary tangles.
Asymmetric Synthesis of Fused Bicyclic<i>N,O</i>- and<i>O,O</i>-Acetals via Cascade Reaction by Gold(I)/<i>N,N</i>′-Dioxide-Nickel(II) Bimetallic Relay Catalysis
hetero‐Diels‐Alder cascadereaction of β,γ‐unsaturated α‐ketoesters with alkyl amides or alcohols were accomplished. The process was based on the utilization bimetallic catalyst system with achiral gold(I) catalyst and chiral N,N′‐dioxide/Ni(II) catalyst, delivering a variety of fused bicyclic N,O‐acetals or O,O‐acetals in up to 99% yield and 99% ee with >19:1 dr under mild reaction conditions. Based
A robust and general protocol for a sustainable copper‐free Sonogashira cross coupling under micellar aqueous reaction conditions with high turnover was developed. By using the commercially available catalyst CataCXium A Pd G3 and THF as co‐solvent, various alkyne substrates were efficiently cross‐coupled with a broad range of aryl halides, providing improved yields and low catalyst loadings. The reaction
为在胶束水相反应条件下以高周转率实现可持续的无铜Sonogashira交叉偶联,开发了一种可靠且通用的方案。通过使用市售的催化剂CataCXium A Pd G3和THF作为助溶剂,各种炔烃底物可以与多种芳基卤化物有效地交叉偶联,从而提高了收率并降低了催化剂的负载量。对反应参数进行了优化,以使该过程操作简单,可靠且可扩展。该方法可通过胶束水溶液反应条件获得二卤代底物的烷基化芳烃,杂环化合物和单官能化产物,并具有提高的选择性。
Metal-free Hydroalkoxylation-Formal [4+2] Cycloaddition Cascade for the Synthesis of Ketals
作者:Santosh J. Gharpure、Santosh K. Nanda、Padmaja、Yogesh G. Shelke
DOI:10.1002/chem.201701659
日期:2017.7.26
A transition metalfree, acid promoted cascade hydroalkoxylation–formal [4+2] cycloaddition of various alkynols with salicylaldehyde is demonstrated for the synthesis of tetrahydrofurano/pyrano‐chromenes and spiroketals. In general, alkynols underwent hydroalkoxylations in an endo‐dig manner when internal alkynes were used to furnish the heteroannular ketals, whereas terminal alkynes proceeded in an