The hydroxyl group is protected by a benzyl group and the carboxylic acid is activated by reaction with thionyl chloride to the acid chloride. The acid chloride reacts with the chiral auxiliary trans-2-phenyl-1-cyclohexanol.
The hydroxyl moiety in this compound is safeguarded by a benzyl group, and the carboxylic acid is amplified through its reaction with thionyl chloride to yield an acid chloride. This acid chloride subsequently reacts with the chiral auxiliary trans-2-phenyl-1-cyclohexanol.