1α-Fluoro A-ring dienol 2, a useful buildingblock for the preparation of fluorinated vitamin D3 analogues, was synthesized in eight steps from 4-[tert-butyldimethylsilyl]oxy}cyclohexanone. The most distinctive synthetic development to emerge from this new synthesis is an unprecedented substrate-controlled diastereoselective fluorodesilylation of an advanced dienylsilane intermediate. This is the