Triethylamine → tert-butyl (2S)-2-[(1R,2R)-1-methoxy-2-methyl-3-oxo-3-[[(1S)-2-phenyl-1-(1,3-thiazol-2-yl)ethyl]amino]propyl]pyrrolidine-1-carboxylate

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To a solution of #11 (280 mg, 0.974 mmol, 1 eq.) and #15 (460 mg, 1.44 mmol, 1.48 eq.) in N,N-dimethylformamide (3 mL, 0.32 M) at 0° C. was added diethylphosphoryl cyanide (DEPC) (93% purity, 212 μL, 1.30 mmol, 1.34 eq.), followed by triethylamine (367 μL, 2.63 mmol, 2.7 eq.). After 2 hours at 0° C., the reaction mixture was warmed to room temperature for 18 hours. The reaction mixture was then diluted with ethyl acetate:toluene (2:1, 30 mL) and was washed successively with 1 M aqueous sodium bisulfate solution (35 mL) and 50% saturated aqueous sodium bicarbonate solution (4×25 mL). The organic layer was dried over sodium sulfate, filtered, concentrated in vacuo, and purified by silica gel chromatography (12% to 100% ethyl acetate in heptane) to give #16 as a light amber oil (374 mg, 81%). LC-MS: m/z 474.4 [M+H+], 374.4 [(M−2-methylprop-1-ene)+H+] retention time=3.63 minutes; 1H NMR (400 MHz, DMSO-d6), characteristic signals: δ 8.66 (d, J=8.5 Hz, 1H), 7.78 (d, J=3.3 Hz, 1H), 7.64 (d, J=3.3 Hz, 1H), 7.21-7.31 (m, 4H), 7.14-7.20 (m, 1H), 5.40 (ddd, J=11.4, 8.5, 4.0 Hz, 1H), 3.23 (br s, 3H), 2.18 (dq, J=9.7, 6.7 Hz, 1H), 1.06 (d, J=6.6 Hz, 3H).

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