反应详情

3-(4-Acetoxymethyl-7-chloro-1H-indazol-5-yl)-2-(R)-benzyloxycarbonylamino-propionic acid methyl ester (290 mg, 0.63 mmol) was converted into the desired product in a manner analogous to the preparation of 2-(R)-benzyloxycarbonylamino-3-(4-tert-butoxycarbonylamino-2-hydroxymethyl-3-methyl-phenyl)-propionic acid methyl ester. Crude product was obtained as an orange solid in 95% yield. Material was carried forward without firther purification. 1H NMR (300 MHz, CDCl3): δ=8.15 (s, 1H); 7.27 (m, 5H); 7.14 (s, 1H); 6.10 (m, 1H); 5.01 (d, J=4.8, 2H); 4.95 (s, 2H); 4.75 (m, 1H); 3.79 (s, 3H); 3.34 (m, 1H); 3.09 (m, 1H). MS m/e (M+H)+=418.0.