The present invention relates to a process for the preparation of a compound of formula (V), in particular posaconazole, wherein said process comprises the steps of (1) providing a mixture comprising a compound of formula (IV), a protic solvent system, and a suitable base; and (2) heating the mixture of (1) to obtain a mixture comprising the compound of formula (V).
A process for the preparation of a chiral compound, in particular posaconazole, wherein the process comprises mixing and reacting the compounds of formula (I) Y
3
—NH
2
; of formula (IIa) 0=C═N—Y
0
and/or of formula (IIb) and of formula (III) in a solvent in any order to obtain a reaction mixture containing a chiral compound of formula (IV) and/or formula (V).
The present invention relates to a process for the preparation of a chiral compound according to formula (V) wherein R
1
is preferably an alkyl residue preferably having from 1 to 6 carbon atoms, in particular to a process for the preparation of a chiral compound the crystalline chiral compounds as such, and their use for the preparation of an antifungal agent, in particular posaconazole.