The THF solution (1 ml) containing 2,6-bis[(4S)-phenyl-2-oxazoline-2-yl]pyridine (0.03 mmol, 11.1 mg) and Cu(OTf)2 (II) (0.03 mmol, 11.1 mg) was stirred for 30 minutes at room temperature. After the reaction mixture was cooled to 0° C., the THF solution (1.5 ml) of 5′-O-[bis(4-methoxyphenyl)phenylmethyl]uridine (0.3 mmol, 164.0 mg) and the THF solution (1 ml) of phenyl isocyanate (0.3 mmol, 35.7 mg) were added thereto. After the mixture was continuously stirred for 19 hours at 0° C., the mixture was analyzed with high-performance liquid chromatography. As a result, it was found that 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-2′-O-phenylcarbamoyl-uridine and 5′-O-[bis(4-methoxyphenyl)phenylmethyl]-3′-O-phenylcarbamoyl-uridine were produced at the ratio of 68:32, and the transformation ratio of the reaction was 81%.
