Enantioselective Synthesis of cis - and trans -Cycloheptyl β-Fluoro Amines by Sequential aza-Henry Addition/Ring-Closing Metathesis.

The synthesis of 7-membered carbocyclic β-fluoroamines is accomplished by a combination of the enantioselective aza-Henry reaction of aliphatic N -Boc imines and ring-closing metathesis. Use of reductive denitration gives both diastereomers of the β-fluoro amine carbocycle, each with high enantiomeric excess.