Dicyclohexylamine → N-Benzyloxycarbonyl-beta-tert-butyl-L-aspartyl-L-leucyl-Nepsilon-tert-butyloxycarbonyl-L-lysine

HRID 462867Notes

Reaction equation

HRID 462867 reaction equation
[NH:1]([C:21]([O:23][CH2:24][C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[O:22])[C@H:2]([C:11]([O:13]N1C(=O)CCC1=O)=O)[CH2:3][C:4](=[O:10])[O:5]C(C)(C)C.[NH2:31][C@H:32]([C:37]([NH:39][C@H:40]([C:53]([OH:55])=[O:54])[CH2:41][CH2:42][CH2:43][CH2:44][NH:45][C:46]([O:48][C:49]([CH3:52])([CH3:51])[CH3:50])=[O:47])=[O:38])[CH2:33][CH:34]([CH3:36])[CH3:35].[CH3:56]CN(CC)CC.C1CCC(N[CH:70]2[CH2:75][CH2:74]CCC2)CC1>CN(C=O)C>[CH2:24]([O:23][C:21]([NH:1][C@H:2]([C:11]([NH:31][C@H:32]([C:37]([NH:39][C@H:40]([C:53]([OH:55])=[O:54])[CH2:41][CH2:42][CH2:43][CH2:44][NH:45][C:46]([O:48][C:49]([CH3:50])([CH3:52])[CH3:51])=[O:47])=[O:38])[CH2:33][CH:34]([CH3:36])[CH3:35])=[O:13])[CH:3]([C:75]([CH3:74])([CH3:70])[CH3:56])[C:4](=[O:10])[OH:5])=[O:22])[C:25]1[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=1

Participants

6

Reactant 4

HCID 7582DicyclohexylamineHCID 8471Triethylamine2×HCID 11026196L-Aspartic acid, N-((phenylmethoxy)carbonyl)-, 4-(1,1-dimethylethyl) 1-(2,5-dioxo-1-pyrrolidinyl) esterHCID 13501958HCID 13501958, compound

Product 1

HCID 131714165N-Benzyloxycarbonyl-beta-tert-butyl-L-aspartyl-L-leucyl-Nepsilon-tert-butyloxycarbonyl-L-lysine

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

A solution of Z-Asp(OtBu)-OSu (115.6 g; 0.275 mol) in DMF (1.16 L) was stirred at 0° in a 3 L, 3-necked round bottom flask fitted with a mechanical stirrer and thermometer. The H-Leu-Lys(Boc)-OH (89.86 g; 0.250 mol) was added followed by Et3N (35.2 mL; 0.25 mol). The reaction mixture was stirred at 0° for 0.5 h and at 25° for 1.5 h. Additional Et3N (17 mL) was added (to maintain pH 8) and the reaction mixture stirred at 25° for 20 h. The reaction mixture was evaporated, dissolved in EtOAc (3 L), washed with 1M citric acid (3×1 L), H2O (3×1 L), dried (MgSO4) and evaporated in vacuo. The residual paste was dissolved in anhydrous ether (5 L) and stirred magnetically while DCHA (53.5 mL; 0.268 mol) was added slowly. After standing in the cold room (20 h) the white salt was collected and washed with anhydrous ether (2×0.5 L) and petroleum ether (2×0.5 L). Yield: 177 g (84%); m.p. 173°-174°; [α]D25 -12.57° (c 1, MeOH).

Workup

  1. customfitted with a mechanical stirrer
  2. temperature(to maintain pH 8)
  3. stirringthe reaction mixture stirred at 25° for 20 h
  4. customThe reaction mixture was evaporated
  5. dissolutiondissolved in EtOAc (3 L)
  6. washwashed with 1M citric acid (3×1 L), H2O (3×1 L)
  7. dry with materialdried (MgSO4)
  8. customevaporated in vacuo
  9. dissolutionThe residual paste was dissolved in anhydrous ether (5 L)
  10. additionwas added slowly
  11. customAfter standing in the cold room (20 h)
  12. customwas collected
  13. washwashed with anhydrous ether (2×0.5 L) and petroleum ether (2×0.5 L)

Sources & evidence

ORD record
ord-d2e465ca411540ebb680767f34dea6d4
Source dataset
uspto-grants-1985_05
Patent number
US04517119

Reaction notes

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