Acetic Acid → N,N'-Dicyclohexylurea

HRID 436376Notes

Reaction equation

HRID 436376 reaction equation
C1[C@H](N)[C@@H]([O:8][C@H]2O[C@H](CN)[C@@H](O)[C@H](O)[C@H]2N)[C@H](O[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)[C@@H](O)[C@@H]1N.FC(F)(F)C([O-])=O.[CH:39]1([N:45]=[C:46]=[N:47][CH:48]2[CH2:53][CH2:52][CH2:51][CH2:50][CH2:49]2)[CH2:44][CH2:43][CH2:42][CH2:41][CH2:40]1.C1[C@H](N)[C@@H](O[C@H]2O[C@H](CN)[C@@H](O)[C@H](O)[C@H]2N)[C@H](O[C@@H]2O[C@H](CO)[C@@H](O)[C@H]2O)[C@@H](O)[C@@H]1N.C(O)(=O)C>O1CCCC1.CN(C)C=O>[C:46]([NH:45][CH:39]1[CH2:40][CH2:41][CH2:42][CH2:43][CH2:44]1)([NH:47][CH:48]1[CH2:53][CH2:52][CH2:51][CH2:50][CH2:49]1)=[O:8]

Participants

7

Reactant 4

HCID 176Acetic AcidHCID 10868Dicyclohexylcarbodiimide2×HCID 33042RibostamycinHCID 86734495HCID 86734495, compound

Product 1

HCID 4277N,N'-Dicyclohexylurea

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8028TetrahydrofuranSolvent3×

Procedure

2 g of the ribostamycin trifluoroacetate prepared in the same manner as in Example 1 was taken and dissolved in 35 ml of a liquid mixture of tetrahydrofuran and dimethylformamide (10:1 by volume). This solution was admixed with a solution of 1.74 g of (S)-α-hydroxy-δ-N-phthalimido-n-valeric acid in 16 ml of tetrahydrofuran. A solution of 3.62 g of dicyclohexylcarbodiimide in 16 ml of tetrahydrofuran was added thereto under ice-cooling. The mixture was agitated for 30 minutes under ice-cooling and agitated at ambient temperature for 1 hour 25 minutes to effect the esterification of the hydroxyl groups of the ribostamycin with the substituted valeric acid. The reaction mixture was admixed with 0.8 ml of glacial acetic acid and allowed to stand at ambient temperature overnight to decompose the excess of dicyclohexylcarbodiimide. The dicylcohexylurea by-produced which precipitated was removed by filtration. The filtrate was concentrated to give a solid comprising mixed trifluoroacetic acid salts of O-((S)-α-hydroxy-δ-N-phthalimido-n-valeryl)-ribostamycins.

Workup

  1. temperatureunder ice-cooling
  2. temperaturecooling
  3. stirringagitated at ambient temperature for 1 hour 25 minutes
  4. waitto stand at ambient temperature overnight

Sources & evidence

ORD record
ord-a9a6bd13049f4c069b8c4f1cc8be2cad
Source dataset
uspto-grants-1977_02
Patent number
US04008362

Reaction notes

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