Methanol → Clarithromycin

HRID 1065940

Reaction equation

HRID 1065940 reaction equation
P([O-])([O-])([O-])=O.[CH3:6][CH2:7][C@H:8]1[O:23][C:21](=[O:22])[C@H:20]([CH3:24])[C@@H:19]([O:25][C@@H:26]2[O:31][C@@H:30]([CH3:32])[C@H:29]([OH:33])[C@@:28]([O:35][CH3:36])([CH3:34])[CH2:27]2)[C@H:18]([CH3:37])[C@@H:17]([O:38][C@@H:39]2[O:44][C@H:43]([CH3:45])[CH2:42][C@H:41]([N:46]([CH3:48])[CH3:47])[C@H:40]2[OH:49])[C@@:16]([OH:51])([CH3:50])[CH2:15][C@@H:14]([CH3:52])[C:12](=[O:13])[C@H:11]([CH3:53])[C@@H:10]([OH:54])[C@@:9]1([OH:56])[CH3:55].[CH3:57]O>>[CH3:6][CH2:7][C@H:8]1[O:23][C:21](=[O:22])[C@H:20]([CH3:24])[C@@H:19]([O:25][C@@H:26]2[O:31][C@@H:30]([CH3:32])[C@H:29]([OH:33])[C@@:28]([O:35][CH3:36])([CH3:34])[CH2:27]2)[C@H:18]([CH3:37])[C@@H:17]([O:38][C@@H:39]2[O:44][C@H:43]([CH3:45])[CH2:42][C@H:41]([N:46]([CH3:47])[CH3:48])[C@H:40]2[OH:49])[C@@:16]([O:51][CH3:57])([CH3:50])[CH2:15][C@@H:14]([CH3:52])[C:12](=[O:13])[C@H:11]([CH3:53])[C@@H:10]([OH:54])[C@@:9]1([OH:56])[CH3:55]

Participants

4

Reactant 3

HCID 887Methanol2×HCID 1061PhosphateHCID 12560Erythromycin

Product 1

HCID 84029Clarithromycin

Procedure

Each fraction was analyzed by thin layer chromatography (E. Merck Darmstadt. thin layer chromatography plate silica gel 60 silanized precoated, thickness 0.25 mm), developing in a mixture of methanol and a 0.1 M phosphate buffer solution (pH 7.0) (3:2). The fractions having Rf value 0.42 (c.f., erythromycin A, Rf value 0.46) were combined and most of the methanol was evaporated in vacuo. The residue was made alkaline with sodium carbonate and extracted with chloroform. The chloroform layer was washed with water, dried and concentrated in vacuo. The crystals obtained were recrystallized from a mixture of chloroform and diisopropyl ether (1:2), giving 700 mg of pure 6-O-methylerythromycin A (formula(I), R1 is hydrogen) in the form of colorless needles.

Workup

  1. customwas evaporated in vacuo
  2. extractionextracted with chloroform
  3. washThe chloroform layer was washed with water
  4. customdried
  5. concentrationconcentrated in vacuo
  6. customThe crystals obtained
  7. customwere recrystallized from a mixture of chloroform and diisopropyl ether (1:2)

Sources & evidence

ORD record
ord-6817c63addcc4779b9f827a3ce50c03c
Source dataset
uspto-grants-1982_05
Patent number
US04331803

Linked notes

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