2-trimethylsilylethyl (2R,4R)-3-{3-{2-[4-tert-butoxycarbonyl-2-(2-chlorophenyl)-3-thiazolidinyl]-2-oxoethyl}ureido}benzoate 、
四丁基氟化铵 在
crude product 、 silica 、 ethyl 、
Acetate methanol 、 expected product 、
异丙醚 、
氯仿 、 7H 、 1H 、 N--C6H4 、
溴化钾 作用下,
以0.65 g of (2R,4R)-3-{3-{2-[4-tert-butoxycarbonyl-2-(2-chlorophenyl)-3-thiazolidinyl]-2-oxoethyl}ureido}benzoic acid is thus obtained in the form of an amorphous solid ([α]D20 =+88°±2° (C=0.39%; CHCl3)) [proton NMR (200 MHz, DMSO D6, δ in ppm), 2 rotamers at room temperature, peak coalescence at 120° C., characteristic chemical shifts at 120° C.: 7.3 to 7.6 (m, 7H, aromatic); 7.95 (bs, 1H, N--C6H4 -- in position 2). Infrared spectrum (KBr), characteristic bands in cm-1 : 3390, 2985, 2940, 2600, 1735, 1660, 1610, 1560, 1375, 1240, 1155, 755, 685]的产率得到(2R,4R)-3-{3-{2-[4-tert-butoxycarbonyl-2-(2-chlorophenyl)-3-thiazolidinyl]-2-oxoethyl}ureido}benzoic acid