Z-Glu(OtBu)-Val-Val-Glu(OtBu)-Glu(OtBu)-Ala-Glu(OtBu)-Asn-OtBu → H-Glu(OtBu)-Val-Val-Glu(OtBu)-Glu(OtBu)-Ala-Glu(OtBu)-Asn-OtBu

HRID 2164478Notes

Reaction equation

HRID 2164478 reaction equation
[NH:1](C(OCC1C=CC=CC=1)=O)[C@H:2]([C:12]([NH:14][C@H:15]([C:19]([NH:21][C@H:22]([C:26]([NH:28][C@H:29]([C:39]([NH:41][C@H:42]([C:52]([NH:54][C@H:55]([C:57]([NH:59][C@H:60]([C:70]([NH:72][C@H:73]([C:78]([O:80][C:81]([CH3:84])([CH3:83])[CH3:82])=[O:79])[CH2:74][C:75](=[O:77])[NH2:76])=[O:71])[CH2:61][CH2:62][C:63](=[O:69])[O:64][C:65]([CH3:68])([CH3:67])[CH3:66])=[O:58])[CH3:56])=[O:53])[CH2:43][CH2:44][C:45](=[O:51])[O:46][C:47]([CH3:50])([CH3:49])[CH3:48])=[O:40])[CH2:30][CH2:31][C:32](=[O:38])[O:33][C:34]([CH3:37])([CH3:36])[CH3:35])=[O:27])[CH:23]([CH3:25])[CH3:24])=[O:20])[CH:16]([CH3:18])[CH3:17])=[O:13])[CH2:3][CH2:4][C:5](=[O:11])[O:6][C:7]([CH3:10])([CH3:9])[CH3:8]>CN(C=O)C.[Pd].[O-]S([O-])(=O)=O.[Ba+2]>[NH2:1][C@H:2]([C:12]([NH:14][C@H:15]([C:19]([NH:21][C@H:22]([C:26]([NH:28][C@H:29]([C:39]([NH:41][C@H:42]([C:52]([NH:54][C@H:55]([C:57]([NH:59][C@H:60]([C:70]([NH:72][C@H:73]([C:78]([O:80][C:81]([CH3:84])([CH3:83])[CH3:82])=[O:79])[CH2:74][C:75](=[O:77])[NH2:76])=[O:71])[CH2:61][CH2:62][C:63](=[O:69])[O:64][C:65]([CH3:68])([CH3:67])[CH3:66])=[O:58])[CH3:56])=[O:53])[CH2:43][CH2:44][C:45](=[O:51])[O:46][C:47]([CH3:48])([CH3:49])[CH3:50])=[O:40])[CH2:30][CH2:31][C:32](=[O:38])[O:33][C:34]([CH3:35])([CH3:36])[CH3:37])=[O:27])[CH:23]([CH3:25])[CH3:24])=[O:20])[CH:16]([CH3:18])[CH3:17])=[O:13])[CH2:3][CH2:4][C:5](=[O:11])[O:6][C:7]([CH3:10])([CH3:8])[CH3:9]

Participants

4

Reactant 1

HCID 13501918Z-Glu(OtBu)-Val-Val-Glu(OtBu)-Glu(OtBu)-Ala-Glu(OtBu)-Asn-OtBu

Product 1

HCID 13501920H-Glu(OtBu)-Val-Val-Glu(OtBu)-Glu(OtBu)-Ala-Glu(OtBu)-Asn-OtBu

Reagents, catalysts & solvents 2

HCID 16218511Pd barium sulfateCatalystHCID 6228DimethylformamideSolvent

Procedure

A solution of Z-Glu(OtBu)-Val-Val-Glu(OtBu)-Glu(OtBu)-Ala-Glu(OtBu)-Asn-OtBu (Ro 22-4311/001, 42.6 g; 32.0 mmol) in DMF (650 mL) containing 10% Pd-BaSO4 (15.0 g) was hydrogenated in a Vibromixer apparatus for 3 h. The reaction mixture was filtered through a bed of celite which was washed with DMF (5×250 mL). The combined filtrate was evaporated to 600 mL and DMSO (300 mL) added. The resultant solution was used for the next stage of synthesis. A portion was evaporated to dryness, taken up in MeOH and precipitated with Et2O. The resultant gel was filtered, washed with Et2O and dried in vacuo; mp 246°-249° dec; [α]D25 -18.78° (c 1, DMF); Rf 0.78 (n-BuOH:AcOH:Pyr:H2O; 1-1-1-1). Anal. calc. for C57H99N9O18 (1198.46): C, 57.13; H, 8.33; N, 10.52. Found: C, 56.83; H, 8.32; N, 10.39.

Workup

  1. filtrationThe reaction mixture was filtered through a bed of celite which
  2. washwas washed with DMF (5×250 mL)
  3. customThe combined filtrate was evaporated to 600 mL and DMSO (300 mL)
  4. additionadded
  5. customThe resultant solution was used for the next stage of synthesis
  6. customA portion was evaporated to dryness
  7. customprecipitated with Et2O
  8. filtrationThe resultant gel was filtered
  9. washwashed with Et2O
  10. customdried in vacuo

Sources & evidence

ORD record
ord-e50308fb8fe241bca6e6436a2919f5b2
Source dataset
uspto-grants-1985_03
Patent number
US04504415

Reaction notes

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