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HRID859837

反应详情

EQUATION

反应方程式

HRID 859837 的结构方程式

REACTANTS

反应物

2
结构：CC(=O)O[C@H]1C(=O)[C@]2(C)[C@@H](OC(C)=O)C[C@H]3OC[C@@]3(OC(C)=O)[C@H]2[C@H](OC(=O)c2ccccc2)[C@]2(O)C[C@H](OC(C)=O)C(C)=C1C2(C)C
HCID10974398

未命名化合物

结构：COCC[O][Al+][O]CCOC.[H-]
HCID22591236

未命名化合物

PRODUCTS

生成物

1
结构：CC(=O)O[C@H]1C(=O)[C@]2(C)[C@@H](OC(C)=O)C[C@H]3OC[C@@]3(OC(C)=O)[C@H]2[C@H](O)[C@]2(O)C[C@H](OC(C)=O)C(C)=C1C2(C)C
HCID101099626

未命名化合物

收率 42%

AUXILIARIES

试剂、催化剂与溶剂

1
结构：C1CCOC1
溶剂HCID8028

Tetrahydrofuran

C4H8O

CONDITIONS

反应条件

温度
0 °C

PROCEDURE

实验过程

Bis(2-methoxyethoxy)-aluminum hydride (65+ wt % in toluene, 3 equiv.) was added dropwise to a stirred solution of 7,13-diacetylbaccatin III (170 mg, 253 μmol) in dry THF (2 mL) at 0° C. After stirring for 30 minutes at 0° C., the reaction was quenched by dropwise addition of saturated NH4Cl. The mixture was stirred for 10 minutes, then warmed to room temperature and diluted with EtOAc (50 mL), followed by addition of water (10 mL). The aqueous phase was separated and extracted again with EtOAc (2×25 mL). The combined organic fractions were washed with brine and water, then dried over anhydrous MgSO4. The solvent was evaporated and the crude product was purified by silica gel flash column chromatography (40–60% EtOAc gradient in hexane) to yield 2-debenzoyl-7,13-diacetylbaccatin III (see FIG. 11) (60 mg, 42% yield, 99% purity by 1H-NMR). 1H-NMR (300 MHz, CDCl3)δ: 1.04 (s, CH3), 1.22 (s, CH3), 1.77 (s, CH3), 1.85 (ddd, J=1.8, 10.8, and 14.4 Hz, H-6β), 1.90 (d, J=1.2 Hz, vinyl-CH3), 2.02 (s, C(O)CH3), 2.14 (s, C(O)CH3), 2.15 (s, C(O)CH3), 2.20 (s, C(O)CH3), 2.58 (ddd, J=7.2, 9.6, and 14.4 Hz, H-6α), 2.65 (d, J=5.1 Hz, OH at C-2), 3.58 (d, J=6.9 Hz, H-3), 3.90 (dd, J=5.4 and 6.5 Hz, H-2), 4.49 (d, J=9.6 Hz, H-20α), 4.63 (d, J=9.6 Hz, H-20β), 4.97 (dd, J=1.8 and 9.6 Hz, H-5), 5.55 (dd, J=7.2 and 10.7 Hz, H-7), 6.15 (dt, J=1.2 and 9.6 Hz, H-13), 6.18 (s, H-10), H-14 proton signal obscured. APCI-MS: m/z 567 (PH+)

WORKUP

后处理

  1. customthe reaction was quenched by dropwise addition of saturated NH4Cl
  2. stirringThe mixture was stirred for 10 minutes
  3. temperaturewarmed to room temperature
  4. additiondiluted with EtOAc (50 mL)
  5. additionfollowed by addition of water (10 mL)
  6. customThe aqueous phase was separated
  7. extractionextracted again with EtOAc (2×25 mL)
  8. washThe combined organic fractions were washed with brine and water
  9. dry with materialdried over anhydrous MgSO4
  10. customThe solvent was evaporated
  11. customthe crude product was purified by silica gel flash column chromatography (40–60% EtOAc gradient in hexane)