Enantioselective Aldol

Evans auxillary-controlled enantioselective syn Aldol reaction

Background Colour:

Sn2

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The Z-boron enolate adopts the non-chelated conformation with the imide carbonyl opposite the enolate oxygen. The auxiliary hinders the top face of the enolate so the aldehyde attacks from below to form a chair like transition state. Boron enolate Z-geometry produces the syn product whereas the auxiliary controls facial selectivity and therefore a single enantiomer is formed.

 

 

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