D-Serine → 2-[(1-Cyclohexylcarbonyloxy-2-methylpropoxy)carbonylamino]-3-hydroxypropanoic Acid

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Following the general procedure for the synthesis of acyloxyalkyl carbamates, D-serine (0.40 g, 3.80 mmol) and 1-(2,5-dioxoazolidinyloxycarbonyloxy)-2-methylpropyl cyclohexanecarboxylate (1.0 g, 2.93 mmol) were reacted in the acetonitrile/water mixture to provide 0.091 g (10% yield) of the title compound (34) as a white wax after work-up and mass-guided preparative HPLC purification. 1H NMR (CDCl3, 400 MHz): δ=6.58 (dd, 1H), 6.11 (dd, 1H), 4.42-4.31 (m, 1H), 4.11-3.92 (br dd, 2H), 2.38 (m, 1H), 2.11 (m, 1H), 1.97 (br d, 2H), 1.77 (br d, 2H), 1.6 (br d, 1H), 1.4 (q, 2H), 1.2 (br m, 3H), 0.99 (dd, 6H). MS (ESI) m/z 354.22 (M+Na)+; 330.21 (M−H)−.

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