反应详情

By carrying out the esterification of the product of Example 62, with terbutanol in the presence of dicyclohexylcarbodiimide and 4-dimethylamino-pyridine as in Example 60, the expected product melting at 96°-97° C. with a Rf=0.32 (eluant: methylene chloride--acetone (98-2)) was obtained.