Patent ID: 8829208

Claim:
A process for the preparation of the compound of formula (I): comprising the steps of: i) reacting a 3-amino-2-hydroxy-4-phenylbutane derivative of formula (II) wherein X is a leaving group selected from the group consisting of a halogen, sulfonate, alkanoate and —N + Me 3 X′ − , wherein X′ is —OTf, —OTs, —I, —Br, —CI or —OH, with a (3R, 3aS, 6aR)-hexahydrofuro [2,3-b] furan-3-yloxy carbonyl derivative of formula (III) wherein R is selected from the group consisting of halogen, imidazolyl, benzotriazolyl, oxysuccinimidyl, oxybenzotriazolyl, 4-nitrophenoxy, 4-methoxyphenoxy, 2-nitrophenoxy and pentafluorophenoxy to obtain a compound of formula (IV); ii) reacting the compound of formula (IV) with isobutylamine to obtain a compound of formula (V) iii) reacting the compound of formula (V) with a substituted phenylsulfonyl derivative to form a compound of formula (I).