反应 #1435738

ord-a8e7b5bcc1c24025ae3c1b39599ac2cd

反应方程式

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
收率 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
收率 58.0%

反应物

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

试剂

无

溶剂

C1CCOC1
THF

反应条件

温度
0°CELSIUS
详细条件
See reaction.notes.procedure_details.

后处理

  1. 1
    其他was quenched with water
  2. 2
    其他After evaporation of the majority of the solvent, dilute NaHCO3 solution
  3. 3
    workup.ADDITIONwas added
  4. 4
    萃取the mixture was extracted three times with EtOAc
  5. 5
    洗涤The combined organic layers were washed with water and brine
  6. 6
    干燥dried over MgSO4
  7. 7
    其他The crude product was purified by silica gel chromatography

实验过程

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.

来源

DOI: 10.6084/m9.figshare.5104873.v1专利: US07211568B2uspto-grants-2007_05