Acetic Acid → N,N'-Dicyclohexylurea

HRID 436259Notes

Reaction equation

HRID 436259 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 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-4a0492f3f4c745d5ab2c3d8246d6a9f1
Source dataset
uspto-grants-1977_02
Patent number
US04008218

Reaction notes

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