Diisoamyl ketone → (S)-3-(4-Benzyloxy-phenyl)-N-tert-butyl-2-[4-methyl-1-(3-methyl-butyl)-pentylamino]-propionamide monohydrochloride

(S)-2-Amino-3-(4-benzyloxy-phenyl)-N-tert-butyl-propionamide monohydrochloride (1.04 g. 2.87 mmol, Example 2, Step A) and diisoamyl ketone (0.490 g, 2.87 mmol Aldrich, Milwaukee. Wis.) were mixed in CH2Cl2 (25 mL). After stirring at ambient temperature under a nitrogen atmosphere for 30 minutes, the solution was cooled to 0° C. in an ice-water bath. To this solution was added sodium triacetoxyborohydride (0.910 g, 4.30 mmol). The resulting reaction mixture was stirred for 30 minutes at 0° C., followed by an additional 12 hours at ambient temperature. Saturated aqueous NaHCO3 solution (25 mL) was added to the reaction mixture, and the resulting mixture was stirred for 5 minutes. The two layers were separated, and the aqueous layer was extracted with CH2Cl2 (2×30 mL). The combined organic solution was dried over Na2SO4. The solution was concentrated in vacuo affording a viscous oil. The crude product was further purified by flash chromatography (25% EtOAc in hexanes). The free amine was dissolved in 10 mL of ethyl ether and treated with ethereal HCl to afford 0.45 g (30%) of the pure titled compound as a white solid; mp 114-115° C.

1. temperaturethe solution was cooled to 0° C. in an ice-water bath
2. customThe resulting reaction mixture
3. stirringwas stirred for 30 minutes at 0° C.
4. waitfollowed by an additional 12 hours at ambient temperature
5. stirringthe resulting mixture was stirred for 5 minutes
6. customThe two layers were separated
7. extractionthe aqueous layer was extracted with CH2Cl2 (2×30 mL)
8. dry with materialThe combined organic solution was dried over Na2SO4
9. concentrationThe solution was concentrated in vacuo
10. customaffording a viscous oil
11. customThe crude product was further purified by flash chromatography (25% EtOAc in hexanes)
12. dissolutionThe free amine was dissolved in 10 mL of ethyl ether
13. additiontreated with ethereal HCl

ORDレコード

ord-d014b2777f364539a0079004ce810a0d

出典データセット

uspto-grants-2001_01

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06180677B2