Highly Diastereoselective Allylic Azide Formation and Isomerization. Synthesis of 3(2‘-Amino)-β-lactams
摘要:
The stereoselective anti S(N)2' attack of NaN3 to 3-alkenyl-3-bromo-azetidin-2-ones gave a mixture of diastereomeric azides in fast equilibrium. The [3,3]-sigmatropic rearrangement of allylic azides occurred with complete stereocontrol, allowing the equilibrium to be directed preferentially toward the (E)- or (Z)-isomer, useful precursors of 3(2'-amino)-beta-lactams.
[EN] GAMMA SECRETASE MODULATORS<br/>[FR] MODULATEURS DE LA GAMMA SÉCRÉTASE
申请人:SCHERING CORP
公开号:WO2009032277A1
公开(公告)日:2009-03-12
This invention provides novel compounds that are modulators of gamma secretase. The compounds have the formula (I). Also disclosed are methods of modulating gamma secretase activity and methods of treating Alzheimer's Disease using the compounds of formula (I).
[EN] GAMMA SECRETASE MODULATORS<br/>[FR] MODULATEURS DE GAMMA SÉCRÉTASE
申请人:SCHERING CORP
公开号:WO2010147975A1
公开(公告)日:2010-12-23
This invention provides novel compounds that are modulators of gamma secretase. The compounds have the Formula I: Also disclosed are methods of modulating gamma secretase activity and methods of treating Alzheimer's Disease using the compounds of Formula I.
This invention provides novel compounds that are modulators of gamma secretase. The compounds have the Formula (I): Also disclosed are methods of modulating gamma secretase activity and methods of treating Alzheimer's Disease using the compounds of Formula (I).
An Investigation of the Reactivity of MCPBA and α-Bromoalkenes under Traditional or Microwave-Assisted Conditions: Selective Formation of Epoxides or Allylic Bromides
The reaction of α-bromo-β,γ-unsaturated lactams and esters with m-chloroperbenzoic acid has been studied to find experimental conditions that could afford exclusively epoxide formation or bromide 1,3-shift. The results show a strong dependence of reactivity on the dilution and on the amount of peracid used, suggesting a radical mechanism for the bromine rearrangement. This last reaction is also strongly favored by microwave-assisted conditions.