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Hydrochloric Acid → 2(R)-Amino-5-phenyl-pentanoic acid (2(S)-hydroxy-1(S)-methyl-2-phenyl-ethyl)-methyl-amide

HRID 966997
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HRID 966997 반응식
[CH3:1][CH:2]([N:11]([C:13]([CH2:15][NH2:16])=[O:14])[CH3:12])[CH:3]([OH:10])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[Li]CCCC.[C:22]1([CH2:28][CH2:29][CH2:30]Br)[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1.Cl>C1COCC1.CCOC(C)=O>[OH:10][C@@H:3]([C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1)[C@@H:2]([N:11]([CH3:12])[C:13](=[O:14])[C@H:15]([NH2:16])[CH2:30][CH2:29][CH2:28][C:22]1[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=1)[CH3:1]
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참가 물질

7

반응물 4

HCID 313Hydrochloric AcidHCID 12503(3-Bromopropyl)benzeneHCID 44543862-amino-N-(1-hydroxy-1-phenylpropan-2-yl)-N-methylacetamideHCID 178418339Butyllithium

생성물 1

HCID 536999852(R)-Amino-5-phenyl-pentanoic acid (2(S)-hydroxy-1(S)-methyl-2-phenyl-ethyl)-methyl-amide

시약·촉매·용매 2

HCID 8028
Tetrahydrofuran
용매
HCID 8857Ethyl Acetate용매

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온도
-78 °C

실험 절차

A solution of pseudoephedrine glycinamide (1.5 g, 6.75 mmol), prepared and used by the method of Myers et al. (J. Am. Chem. Soc. 1997, 119, 656), and LiCI (1.71 g, 40.5 mmol) in THF (30 mL) was cooled to −78° C. and n-BuLi was added (13.16 mmol, 5.25 mL of a 2.5 M solution). After stirring for 20 min at −78° C., the reaction was warmed to 0° C. and stirred an additional 20 minutes. 3-Phenyl-1-bromopropane (1.3 mL, 7.42 mmol) was added and the reaction was stirred for 2 h at 0° C. Aqueous 1 N HCl (50 mL) and EtOAc (50 mL) were added, the organic phase was separated and extracted with 1 N HCl (50 mL). The aqueous extracts were combined, cooled in an ice bath and slowly basified to pH 14 with 6 N NaOH. The product was extracted with CH2Cl2 (4×50 mL) and the combined extracts were dried over MgSO4 and concentrated to give a yellow oil. Purification by flash chromatography (SiO2 gel, 92:4:4, CH2Cl2:MeOH:triethylamine) delivered 400 mg (78%) of the Product of Example 199, Step A: +APcI MS (M+1)+ 341; 1H NMR=400 MHz (CDCl3) δ: 7.38 (m, 10H), 5.26 (m, 1H), 4.15 (m, 1H), 3.86 (m, 1H), 2.36 (s, 3H).

후처리

  1. temperaturethe reaction was warmed to 0° C.
  2. stirringstirred an additional 20 minutes
  3. stirringthe reaction was stirred for 2 h at 0° C
  4. customthe organic phase was separated
  5. extractionextracted with 1 N HCl (50 mL)
  6. temperaturecooled in an ice bath and slowly basified to pH 14 with 6 N NaOH
  7. extractionThe product was extracted with CH2Cl2 (4×50 mL)
  8. dry with materialthe combined extracts were dried over MgSO4
  9. concentrationconcentrated
  10. customto give a yellow oil
  11. customPurification by flash chromatography (SiO2 gel, 92:4:4, CH2Cl2:MeOH:triethylamine)

출처 및 근거

ORD 기록
ord-8abe27118ac34dfc9639b44f66e92981
출처 데이터셋
uspto-grants-2005_10
DOI
10.6084/m9.figshare.5104873.v1
특허 번호
US06953791B2

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