A stereospecific synthesis of 1-acetoxy-5-bromo-2-methyl-2-cis-pentene in 4 steps starting from 3-formyl-5, 6-dihydro-2H-pyran, dimer of acrolein, followed by alkylation of 2- ethoxycarbonyl-3-methylbicyclo [2.2. 1] hept-2-ene with the bromide furnished a facile synthesis of (±)-β-santalol.
