Lithium hydroxide, monohydrate → N-Boc-5-(2-propen-1-yloxy)-L-norvaline

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A mixture of isopropyl 5-allyloxy-2(S)-(tert-butoxycarbonylamino)pentanoate (product of step 26D, 16.1 g, 51.1 mmol) and lithium hydroxide hydrate (4.19 g, 102 mmol) in THF/water (100 mL/20 mL) was stirred at room temperature under nitrogen for 16 hours. The reaction was diluted with water, washed with ether, pH of aqueous fraction adjusted to ˜4, extracted with ether, combined organic fractions washed with saturated NaCl, dried (MgSO4) and evaporated giving 5-allyloxy-2(S)-(tert-butoxycarbonylamino)pentanoic acid as a light yellow syrup: 1H NMR (300 MHz, Chloroform-D) δ 5.89 (ddt, 1H, J=17.4, 10.4, 5.5), 5.25 (dd, 1H, J=17.4, 1.6Hz), 5.17 (dd, 1H, J=10.4, 1.6Hz), 4.30 (br d, 1H, J=6.2), 3.96 (dt, 2H, J=5.9, 1.5Hz), 3.46 (t, 2H, J=5.9Hz), 1.96-1.86 (m, 1H), 1.85-1.77 (m, 1H), 1.75-1.64 (m, 2H), 1.43 (s, 9H). LCMS m/z 274 (M+H)+.

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