Hydrochloric Acid → Methyl 2,5,7-trihydroxy-2-methyl-6,11-dioxo-4-{[2,3,6-trideoxy-3-(dimethylamino)hexopyranosyl]oxy}-1,2,3,4,6,11-hexahydrotetracene-1-carboxylate

HRID 435458Notes

Reaction equation

HRID 435458 reaction equation
C[C@@H]1O[C@@H]([O:8][C@H:9]2[C@@H:14]([N:15]([CH3:17])[CH3:16])[CH2:13][C@H:12]([O:18][C@@H:19]3[C:24]4[C:25]([OH:40])=[C:26]5[C:33](=[O:34])[C:32]6[C:35]([OH:39])=[CH:36][CH:37]=[CH:38][C:31]=6[C:29](=[O:30])[C:27]5=[CH:28][C:23]=4[C@@H:22]([C:41]([O:43][CH3:44])=[O:42])[C@@:21]([OH:46])([CH3:45])[CH2:20]3)[O:11][C@H:10]2[CH3:47])C[C@@H]2O[C@@H]3[C@H](O[C@H]12)O[C@@H](C)C(=O)C3.Cl.[OH-].[Na+].O>CC(C)=O>[CH3:47][CH:10]1[O:11][CH:12]([O:18][CH:19]2[C:24]3[C:25]([OH:40])=[C:26]4[C:33](=[O:34])[C:32]5[C:35]([OH:39])=[CH:36][CH:37]=[CH:38][C:31]=5[C:29](=[O:30])[C:27]4=[CH:28][C:23]=3[CH:22]([C:41]([O:43][CH3:44])=[O:42])[C:21]([OH:46])([CH3:45])[CH2:20]2)[CH2:13][CH:14]([N:15]([CH3:17])[CH3:16])[CH:9]1[OH:8]

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 962WaterHCID 14798Sodium HydroxideHCID 155837Auramycin B

Product 1

HCID 174252Methyl 2,5,7-trihydroxy-2-methyl-6,11-dioxo-4-{[2,3,6-trideoxy-3-(dimethylamino)hexopyranosyl]oxy}-1,2,3,4,6,11-hexahydrotetracene-1-carboxylateYield 54.4%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

To a solution of 100 mg of auramycin B in 15 ml of acetone was added 0.3 ml of concentrated hydrochloric acid and hydrolysed at room temperature for 120 minutes. The reaction mixture was neutralised by dilute sodium hydroxide solution and 20 ml of water was added and extracted with 20 ml of chloroform twice. The extracts were combined and concentrated to a small volume in vacuo. The concentrate was chromatographed by a column packed with silica gel (chloroform:methanol, 95:5). The fractions containing auramycin D were concentrated in vacuo to give 38 mg of auramycin D.

Workup

  1. additionwas added
  2. extractionextracted with 20 ml of chloroform twice
  3. concentrationconcentrated to a small volume in vacuo
  4. customThe concentrate was chromatographed by a column
  5. additionThe fractions containing auramycin D
  6. concentrationwere concentrated in vacuo

Sources & evidence

ORD record
ord-c9fa2e8ab3574789a626ff96221b6e8b
Source dataset
uspto-grants-1983_08
Patent number
US04401812

Reaction notes

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