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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 1068834
ノート
印刷プレビュー

反応式

HRID 1068834 の反応式
[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+].[Cl-].[Li]CCCC.[C:24]1([CH2:30][CH2:31][CH2:32]Br)[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=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])[CH2:32][CH2:31][CH2:30][C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1)[CH3:1]
参加物反応条件実験手順後処理出典と根拠反応ノート

参加物

8

反応物 5

HCID 313Hydrochloric AcidHCID 12503(3-Bromopropyl)benzeneHCID 433294Lithium ChlorideHCID 44543862-amino-N-(1-hydroxy-1-phenylpropan-2-yl)-N-methylacetamideHCID 178418339Butyllithium

生成物 1

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

試薬・触媒・溶媒 2

HCID 8028Tetrahydrofuran溶媒HCID 8857Ethyl Acetate溶媒

反応条件

温度
-78 °C

実験手順

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 LiCl (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 2.5M 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 1N HCl (50 mL) and EtOAc (50 mL) were added, the organic phase was separated and extracted with 1N HCl (50 mL). The aqueous extracts were combined, cooled in an ice bath and slowly basified to pH 14 with 6N 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: +APcl 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).

後処理

  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 1N HCl (50 mL)
  6. temperaturecooled in an ice bath and slowly basified to pH 14 with 6N 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)

出典と根拠

ORDレコード
ord-43cf9ba3cb66406f8aa527eecb7bef2f
出典データセット
uspto-grants-2001_06
DOI
10.6084/m9.figshare.5104873.v1
特許番号
US06251902B1

反応ノート

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