Erythromycin → Flurithromycin
Reaction equation
[CH3:1][CH2:2][C@H:3]1[O:18][C:16](=[O:17])[C@H:15]([CH3:19])[C@@H:14]([O:20][C@@H:21]2[O:26][C@@H:25]([CH3:27])[C@H:24]([OH:28])[C@@:23]([O:30][CH3:31])([CH3:29])[CH2:22]2)[C@H:13]([CH3:32])[C@@H:12]([O:33][C@@H:34]2[O:39][C@H:38]([CH3:40])[CH2:37][C@H:36]([N:41]([CH3:43])[CH3:42])[C@H:35]2[OH:44])[C@@:11]([OH:46])([CH3:45])[CH2:10][C@@H:9]([CH3:47])[C:7](=[O:8])[C@H:6]([CH3:48])[C@@H:5]([OH:49])[C@@:4]1([OH:51])[CH3:50].C[C@@H](O)C[C@H](N(C)C)[C@@H](O)C=O.[F:64]OC(F)(F)F.Cl(F)(=O)(=O)=O>>[CH3:1][CH2:2][C@H:3]1[O:18][C:16](=[O:17])[C@H:15]([CH3:19])[C@@H:14]([O:20][C@@H:21]2[O:26][C@@H:25]([CH3:27])[C@H:24]([OH:28])[C@@:23]([O:30][CH3:31])([CH3:29])[CH2:22]2)[C@H:13]([CH3:32])[C@@H:12]([O:33][C@@H:34]2[O:39][C@H:38]([CH3:40])[CH2:37][C@H:36]([N:41]([CH3:42])[CH3:43])[C@H:35]2[OH:44])[C@@:11]([OH:46])([CH3:45])[CH2:10][C@@:9]([F:64])([CH3:47])[C:7](=[O:8])[C@H:6]([CH3:48])[C@@H:5]([OH:49])[C@@:4]1([OH:51])[CH3:50]Participants
4
Procedure
According to such a synthesis an enol-ether function (2) is generated in the molecule of erythromycin A (1) and subsequently the N-dimethyl group of desosamine is protected as N-oxide (3) to avoid the partial or total N-demethylation of the basic sugar during the fluorination; fluorination of (3) with trifluoromethyl hypofluorite or perchloryl fluoride, followed by hydrogenolysis, gives (8S)-8-fluoroerythromycin A (5). As a matter of fact, by operating according to the disclosure of the second Application erythromycin A can be converted into (8S)-8-fluoroerythromycin A, with a yield of about 35% in four subsequent steps (scheme II):
Sources & evidence
- ORD record
- ord-845e272480e8414691e6782ea896d4f9
- Source dataset
- uspto-grants-1987_06
- Patent number
- US04673736
Reaction notes
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