合成路线1

Benzoxazinone (IV) was prepared by condensation of 2-amino-5-nitrophenol (I) with either chloroacetyl chloride (II) in the presence of NaHCO3 or ethyl bromoacetate (III) in the presence of KF. Subsequent N-alkylation of (IV) with iodomethane provided (V). After reduction of the nitro group of (V) to amine (VI) by hydrogenation over Pd/C, condensation with benzyl chloroformate afforded carbamate (VII). The chiral oxazolidinone (IX) was obtained by reaction of (VII) with (-)-(R)-glycidyl butyrate (VIII) in the presence of butyllithium in THF at low temperature. Conversion of (IX) to mesylate, followed by displacement with NaN3 gave azide (X). Amine (XI) was then obtained by either hydrogenation of (X) over Pd/C or by reduction with trimethyl phosphite. Finally, reaction of (XI) with acetyl chloride and triethylamine provided the title acetamide.