A mixture of formic acid and acetic anhydride was found to be effective for the formation of an oxazolone, which was converted to an active ester in situ in the presence of a phenol or an N-hydroxide.

• 实验发现甲酸和醋酐混合物对恶唑酮的生成非常有效，恶唑酮在苯酚或N-氢氧化物存在的条件下在原位转化为酯。