Reacción #605409

Ecuación de reacción

NaOH

(E)-3-{3,4-Dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-acrylic acid methyl ester hydrochloride

phenyl-acetaldehyde

NaCNBH3

→

(E)-3-{1′-(2-phenyl-ethyl)-3,4-dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-acrylic acid methyl ester

Rendimiento 89.4%

Disolventes

MeOH

AcOH

MeOH

Condiciones de reacción

Tratamiento posterior

1. 1
   Otrothe solvent was removed
2. 2
   Otrothe residue partitioned between 5% aqueous NaHCO3 and DCM
3. 3
   SecadoThe organic phase was dried over Na2SO4
4. 4
   Otroevaporated
5. 5
   OtroThe crude product was purified by column chromatography (eluent: DCM/MeOH 95:5)

Procedimiento

(E)-3-{3,4-Dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-acrylic acid methyl ester hydrochloride (obtained as described in Example 25, Step B, 300 mg, 0.886 mmol) was dissolved in MeOH (30 ml). The pH was adjusted to 5 with AcOH and 1 M NaOH in MeOH, and then phenyl-acetaldehyde (128 mg, 1.06 mmol) and NaCNBH3 (67 mg, 1.06 mmol) were added. The mixture was stirred overnight at RT, then the solvent was removed and the residue partitioned between 5% aqueous NaHCO3 and DCM. The organic phase was dried over Na2SO4 and evaporated. The crude product was purified by column chromatography (eluent: DCM/MeOH 95:5) to give (E)-3-{1′-(2-phenyl-ethyl)-3,4-dihydro-4-oxo-spiro[2H-(1,3)-benzoxazine-2,4′-piperidin]-6-yl}-acrylic acid methyl ester (322 mg).

Fuente