(2R)-1-(benzyloxy)pent-4-en-2-ol → (2R)-1-(benzyloxy)hex-4-en-2-ol

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The product was obtained according to the method used for synthesis of C1 in Preparation P1, except that 1-propenylmagnesium bromide was used in place of vinylmagnesium bromide. The product was obtained as a brown oil, which was used without further purification; by 1H NMR, this material consisted of a 1:1 mixture of geometric isomers. Yield: 140 g, 0.679 mol, 100%. 1H NMR (400 MHz, CDCl3) δ 7.28-7.42 (m, 5H), 5.39-5.67 (m, 2H), 4.57 (s, 2H), 3.80-3.92 (m, 1H), 3.48-3.57 (m, 1H), 3.35-3.43 (m, 1H), 2.36-2.50 (br m, 1H), 2.24-2.33 (m, 1H), 2.17-2.24 (m, 1H), [1.68 (br d, J=6 Hz) and 1.64 (br d, J=7 Hz), total 3H].

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