Acetals, allylic reaction with organocopper compounds

Nucleophilic substitutions reactions with organocopper compounds or the more widely applied organocyanocuprates in the presence of Lewis acids have been reported on a./S-ethylenic acetals and allylic mesylates or acetates. Mangeney and co-workers have reported regio- and diastereoselective Sn2 or Sn2 reactions on chiral acetals of cyclic aldehydes promoted by PhCu and Furthermore, organocoppers react efficiently... 

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