تفاعل #1435738

ord-a8e7b5bcc1c24025ae3c1b39599ac2cd

معادلة التفاعل

CC[C@H]1OC(=O)[C@H](C)[C@@H](O[C@H]2C[C@@](C)(OC)[C@@H](O)[C@H](C)O2)[C@H](C)[C@@H](O[C@@H]2O[C@H](C)C[C@H](N(C)C)[C@H]2O)[C@](C)(O)C[C@@H](C)C(=O)[C@H](C)[C@@H](O)[C@]1(C)O
erythromycin A
[BH4-].[Na+]
NaBH4
→
CC[C@H]1OC(=O)[C@H](C)[C@@H](O[C@H]2C[C@@](C)(OC)[C@@H](O)[C@H](C)O2)[C@H](C)[C@@H](O[C@@H]2O[C@H](C)C[C@H](N(C)C)[C@H]2O)[C@](C)(O)C[C@@H](C)[C@H](O)[C@H](C)[C@@H](O)[C@]1(C)O
product
المردود 58.0%
CC[C@H]1OC(=O)[C@H](C)[C@@H](O[C@H]2C[C@@](C)(OC)[C@@H](O)[C@H](C)O2)[C@H](C)[C@@H](O[C@@H]2O[C@H](C)C[C@H](N(C)C)[C@H]2O)[C@](C)(O)C[C@@H](C)[C@H](O)[C@H](C)[C@@H](O)[C@]1(C)O
(9S)-9-Dihydroerythromycin A
المردود 58.0%

المتفاعلات

CC[C@H]1OC(=O)[C@H](C)[C@@H](O[C@H]2C[C@@](C)(OC)[C@@H](O)[C@H](C)O2)[C@H](C)[C@@H](O[C@@H]2O[C@H](C)C[C@H](N(C)C)[C@H]2O)[C@](C)(O)C[C@@H](C)C(=O)[C@H](C)[C@@H](O)[C@]1(C)O
erythromycin A
[BH4-].[Na+]
NaBH4

الكواشف

لا شيء

المذيبات

C1CCOC1
THF

ظروف التفاعل

درجة الحرارة
0°CELSIUS
الظروف التفصيلية
See reaction.notes.procedure_details.

المعالجة

  1. 1
    أخرىwas quenched with water
  2. 2
    أخرىAfter evaporation of the majority of the solvent, dilute NaHCO3 solution
  3. 3
    workup.ADDITIONwas added
  4. 4
    استخلاصthe mixture was extracted three times with EtOAc
  5. 5
    غسيلThe combined organic layers were washed with water and brine
  6. 6
    تجفيفdried over MgSO4
  7. 7
    أخرىThe crude product was purified by silica gel chromatography

الإجراء التجريبي

To a solution of erythromycin A (22.0 g, 30 mmol) in THF (200 mL) cooled to −10° C. was added NaBH4 (2.27 g, 60 mmol) in small portions. The mixture was then allowed to stir at 0° C. for 3 h before the reaction was quenched with water. After evaporation of the majority of the solvent, dilute NaHCO3 solution was added, the mixture was extracted three times with EtOAc. The combined organic layers were washed with water and brine, dried over MgSO4. The crude product was purified by silica gel chromatography using 2:1 hexane-acetone with 1% Et3N to give pure product (12.8 g, 58% yield). m/z: 736.5 (MH); 13C-NMR (CDCl3): 177.00, 103.21, 96.32, 84.20, 83.10, 79.23, 77.72, 77.63, 74.99, 74.48, 72.66, 70.75, 70.69, 69.29, 66.09, 65.02, 49.32, 45.52, 41.73, 40.32 (2×), 36.91, 34.84, 34.23, 31.97, 28.81, 25.25, 21.68, 21.51, 21.18, 20.06, 18.12, 16.50, 15.06, 14.80, 10.81, 9.36.

المصدر

DOI: 10.6084/m9.figshare.5104873.v1براءة الاختراع: US07211568B2uspto-grants-2007_05