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Following the general procedure for the one pot synthesis, ACPC (1.02 g, 9.8 mmol) was reacted with chlorotrimethylsilane (2.48 mL, 19.7 mmol) in anhydrous chloroform in the presence of DIEA (3.64 mL, 19.7 mmol). Subsequent reaction of the intermediate with 1-chloro-2-methylpropyl chloroformate (1.6 mL, 14.8 mmol) followed by a mixture of DIEA (3.64 mL, 19.7 mmol) and phenylacetic acid (2.6 g, 19.7 mmol) provided 0.560 g (14.4% yield) the title compound (20) as a yellow solid after aqueous work-up and mass-guided preparative HPLC purification. M.p: 142.1-145.6° C. 1H NMR (CDCl3, 400 MHz): δ=7.33 (m, 5H), 6.81 (q, 1H), 5.31 (s, 1H), 3.61 (s, 2H), 1.63 (m, 2H), 1.47 (d, 3H), 1.28 (m, 2H). MS (ESI) m/z 330.08 (M+Na)+.