An Investigation of the Reactivity of MCPBA and α-Bromoalkenes under Traditional or Microwave-Assisted Conditions: Selective Formation of Epoxides or Allylic Bromides
The palladium-catalyzed benzylamine attack to a particular allylic moiety, the 3-alkenyl-3-bromoazetidin-2-one is herein reported. This reaction shows interesting mechanistic aspects and allows us to introduce in one step and under high regio- and stereocontrol the amino function in the C3 side chain of non-conventional β-lactams, thus offering the opportunity for designing new potential glutamine
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.