Processes for the preparation of oxo-oxazoline or alloamino acid derivatives

摘要

A method for producing a compound represented by the general formula (I-A) or the general formula (I-B), comprising the following step: wherein R¹ is an optionally substituted lower alkyl, and the like; R² is a lower alkyl or an optionally substituted aralkyl, and the like; R³ is a lower alkyl, characterized in that a compound represented by the general formula (II-A) or the general formula (II-B) is treated with thionyl chloride.