Abstract: A process for preparing an optically active compound of formula (II) or a salt thereof where * indicates a stereogenic centre; and R1 and R7 are as defined in the specification, which process comprises the acid hydrolysis of an optically active compound of formula (IV) where R5 and R6 are as defined in the specification, recovering the resultant optically active compound of formula (II) as a salt, and thereafter if desired, converting the salt to a compound of formula (II). The process is suitable for the preparation of; for instance, intermediates for pharmaceutical compounds. Certain novel intermediates are also disclosed and claimed.

Abstract: A process for preparing a salt of compound of formula (I) wherein R1 and R2 are independently selected from an organic group other than hydrogen, said process comprising reacting a compound of formula (II) with water and an organic acid, in the absence of hydroxylamine. The reaction is useful in preparing a range of chemical intermediates, in particular chiral compounds.