Development of chiral stabilised azomethine ylids: completing the memory relay
摘要:
We report how the alpha-chirality of L-valine can be "memorised" through a sequence involving chirality transfer to a cyclic template, followed by azomethine ylid generation and enantiospecific cycloaddition to regenerate the centre lost during ylid formation. Subsequent removal of the chiral template furnishes alpha-substituted D-proline derivatives.
Development of chiral stabilised azomethine ylids: A chiral memory relay system.
摘要:
Chiral, stabilised azomethine ylids incorporated in cyclic templates derived from (R)- or (S)-2-phenylglycinol and (S)-valine undergo enantioselective 1,3-dipolar cycloaddition reactions with a variety of dipolarophiles. Removal of the template in the case of adducts derived originally from (S)-valine furnishes enantiomerically pure alpha-substituted proline derivatives.