Reacción #577246

Ecuación de reacción

phosphoric acid di-tert-butyl ester (S)-4-{2-[4-(6-fluoro-hexyloxy)-phenyl]-ethyl}-2-methyl-4,5-dihydro-oxazol-4-ylmethyl ester

HCl

→

phosphoric acid mono-{(S)-2-amino-4-[4-(6-fluoro-hexyloxy)-phenyl]-2-hydroxymethyl-butyl}ester

Disolventes

ethanol

Condiciones de reacción

Tratamiento posterior

1. 1
   Concentraciónconcentrated to dryness
2. 2
   workup.DISSOLUTIONThe residue is re-dissolved in ethyl acetate
3. 3
   Otroprecipitated with hexanes
4. 4
   FiltraciónThe solid is filtered off
5. 5
   Lavadowashed with dry ether
6. 6
   Otrodried under vacuum

Procedimiento

To a solution of phosphoric acid di-tert-butyl ester (S)-4-{2-[4-(6-fluoro-hexyloxy)-phenyl]-ethyl}-2-methyl-4,5-dihydro-oxazol-4-ylmethyl ester (33 mg, 0.050 mmol) in ethanol (2 ml) is added conc. HCl (2 ml). The reaction mixture is stirred at 85° C. for 2 hours, then concentrated to dryness. The residue is re-dissolved in ethyl acetate and precipitated with hexanes. The solid is filtered off, washed with dry ether and dried under vacuum to afford phosphoric acid mono-{(S)-2-amino-4-[4-(6-fluoro-hexyloxy)-phenyl]-2-hydroxymethyl-butyl}ester as a colorless powder.

Fuente