Reagents and conditions: (a) Ti(i-OPr)2(N3)2, Benzene, 70 °C,10 min, 64%. (b) i. P(Me)3, THF, r.t, 18h; ii. 1N NaOH, 2h; iii. (t-Boc)2O, THF/1,4 -dioxane(1:1), satd. NaHCO3, r.t,12h; 91% for 3 steps. (c) TBSCl, imidazole, CH2Cl2, r.t, 2 h, 99%. (d) MOMCl, DIPEA, CH2Cl2, 0°C-r.t, 24h, 99%. (e) TBAF, THF, 0°C-r.t, 2h, 92%. (f) Dess-Martin oxidation, CH2Cl2, r.t, 2h. (g) C14H29MgBr, THF, 0°C-r.t, 2 h, 50% combined yield for 2 steps.