Hydrochloric Acid → Carbamic acid, (6-hydroxyhexyl)-, phenylmethyl ester

To a solution of diisobutylaluminum hydride (49 mL, 1.5 M in toluene) in THF (150 mL) cooled to −78° C. was added a solution of 6-benzyloxycarbonylamino-hexanoic acid methyl ester (10 g, 37 mmol) in THF (100 mL) . The reaction mixture was stirred for 4 h and methanol (2.5 mL) was added carefully at −78 to −75° C. After 2 h, the mixture was poured to 250 mL of 1 N HCl solution cooled in ice-bath, extracted with ethyl acetate (300 mL), washed with brine (3×100 mL), dried over anhydrous magnesium sulfate, and concentrated in vacuo. The residue was purified by flash column chromatography (silica, 50% ethyl acetate in hexane) to yield the titled compound (7.1 g, 80%); white solid, mp 67-68° C.

1. waitAfter 2 h
2. temperaturecooled in ice-bath
3. extractionextracted with ethyl acetate (300 mL)
4. washwashed with brine (3×100 mL)
5. dry with materialdried over anhydrous magnesium sulfate
6. concentrationconcentrated in vacuo
7. customThe residue was purified by flash column chromatography (silica, 50% ethyl acetate in hexane)

ORD-Eintrag

ord-91e6c33f70854a7cbe1e39ff64ca13f9

Quelldatensatz

uspto-grants-2001_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06211241B1