Hydrochloric Acid → Boc-ValCH2F

HRID 2373073Notes

Reaction equation

HRID 2373073 reaction equation
[NH:1]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C@H:2]([C:4]([NH:6][C@H:7]([C:9]([N:11]1[CH2:18][CH2:17][CH2:16][C@H:12]1[C:13]([OH:15])=O)=[O:10])[CH3:8])=[O:5])[CH3:3].CN1CCOCC1.[NH2:33][C@H:34]([C:38]([CH2:40][F:41])=[O:39])[CH:35]([CH3:37])[CH3:36].Cl.Cl>C1COCC1.CN(C=O)C>[NH:33]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C@H:34]([C:38]([CH2:40][F:41])=[O:39])[CH:35]([CH3:37])[CH3:36].[NH:1]([C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[C@H:2]([C:4]([NH:6][C@H:7]([C:9]([N:11]1[CH2:18][CH2:17][CH2:16][C@H:12]1[C:13]([NH:33][C@H:34]([C:38]([CH2:40][F:41])=[O:39])[CH:35]([CH3:37])[CH3:36])=[O:15])=[O:10])[CH3:8])=[O:5])[CH3:3]

Participants

8

Reactant 4

HCID 313Hydrochloric AcidHCID 79724-Methylmorpholine2×HCID 11902955Boc-ala-ala-pro-OHHCID 131717230ValCH2F hydrochloride

Product 2

HCID 131717232Boc-ValCH2FHCID 131717233HCID 131717233, compound

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
-20 °C

Procedure

To a solution of Boc-ValCH2F (0.48 g, 2.06 mmol) in ether (10 mL) was added a saturated solution of HCl in ether (25 mL). The mixture was stirred for 30 minutes at room temperature. The solvent was evaporated under reduced pressure at room temperature. The residue was quickly triturated with ether (2×30 mL) and then was pumped dry, giving 0.24 g of ValCH2F hydrochloride. Boc-Ala-Ala-ProOH (Enzyme Systems Products, 0.503 g, 1.41 mmol) was dissolved in THF (5 mL) and was cooled to -20° C. NMM (0.155 mL, 1.41 mmol) was added, followed by IBCF (0.183 mL, 1.41 mmol) After 5 minutes, this mixture was charged with a solution of ValCH2F hydrochloride (0.24 g, 1.41 mmol) in DMF (2 mL). A second equivalent of NMM (0.155 mL, 1.41 mmol) was added. The mixture was stirred at -15° C. for 15 minutes. 1 molar HCl (15 mL) was added. The product was extracted with ethyl acetate (2×15 mL). The combined extracts were washed with saturated aqueous NaHCO3 (15 mL), brine (15 mL), dried over MgSO4, filtered, and evaporated to dryness. The residue was slowly crystallized at -20° C. from CH2Cl2 /hexane, giving 0.47 g (47% from Boc-ValCH2F of Boc-Ala-Ala-Pro-ValCH2F.

Workup

  1. extractionThe product was extracted with ethyl acetate (2×15 mL)
  2. washThe combined extracts were washed with saturated aqueous NaHCO3 (15 mL), brine (15 mL)
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. customevaporated to dryness
  6. customThe residue was slowly crystallized at -20° C. from CH2Cl2 /hexane

Sources & evidence

ORD record
ord-34e666b630894bdeb835cdc3f090c877
Source dataset
uspto-grants-1992_03
Patent number
US05101068

Reaction notes

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