Acetic Acid → tert-butyl(2S,3S)-2-{[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]amino}-3-methylpentanoate

HRID 1174116Notes

Reaction equation

HRID 1174116 reaction equation
[O:1]=[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[C:4](=[O:11])[N:3]1[CH2:12][CH:13]=O.Cl.[C:16]([O:20][C:21](=[O:28])[C@H:22]([C@H:24]([CH2:26][CH3:27])[CH3:25])[NH2:23])([CH3:19])([CH3:18])[CH3:17].C([BH3-])#N.[Na+].C(O)(=O)C>CO>[O:11]=[C:4]1[C:5]2[C:10](=[CH:9][CH:8]=[CH:7][CH:6]=2)[C:2](=[O:1])[N:3]1[CH2:12][CH2:13][NH:23][C@@H:22]([C@@H:24]([CH3:25])[CH2:26][CH3:27])[C:21]([O:20][C:16]([CH3:17])([CH3:18])[CH3:19])=[O:28]

Participants

6

Reactant 4

HCID 176Acetic AcidHCID 76201Phthalylglycine aldehydeHCID 5003444Sodium cyanoborohydrideHCID 11687228tert-Butyl isoleucinate--hydrogen chloride (1/1)

Product 1

HCID 66891692tert-butyl(2S,3S)-2-{[2-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)ethyl]amino}-3-methylpentanoateYield 59%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Conditions

Temperature
25 °C

Procedure

A solution of the product of Example 3E (36.81 g) in methanol (50 mL) was treated with L-iso-leucine tert-butyl ester hydrochloride (30 g, 134 mmol), sodium cyanoborohydride (16.9 g, 268 mmol), and acetic acid (4.6 ml, 80.4 mmol), stirred at 25° C. for 3 hours and concentrated. The concentrate was partitioned between dichloromethane and saturated NaHCO3. The organic phase was washed with brine and dried over MgSO4, filtered and concentrated. The residue was chromatographed on silica gel, eluting with a gradient starting with 10%-66% ethyl acetate in hexanes to give the title compound (28.44 g, 59% yield).

Workup

  1. concentrationconcentrated
  2. customThe concentrate was partitioned between dichloromethane and saturated NaHCO3
  3. washThe organic phase was washed with brine
  4. dry with materialdried over MgSO4
  5. filtrationfiltered
  6. concentrationconcentrated
  7. customThe residue was chromatographed on silica gel
  8. washeluting with a gradient

Sources & evidence

ORD record
ord-7cd0b69966bb4e098366bf5bfaffc7ed
Source dataset
uspto-grants-2010_11
Patent number
US07834043B2

Reaction notes

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