反应 #302915

反应方程式

diethyl azodicarboxylate

K2CO3

7

1-(3-O-Acetyl-2,5-dideoxy-5-iodo-β-D-threo-pentofuranosyl)-thymine

Ph3P

AcOH

→

8

收率 127.4%

1-(3-O-Acetyl-2,5-dideoxy-β-L-glycero-pent-4-enofuranosyl)-thymine

收率 127.4%

溶剂

MeOH

THF

反应条件

后处理

1. 1
   温度was cooled to 0 under positive pressure of dry Ar
2. 2
   其他the mixture was partitioned between CH2Cl2 and sat. aqueous NaHCO3
3. 3
   干燥The organic layer was dried (Na2SO4)
4. 4
   其他evaporated
5. 5
   其他The mixture was partitioned between CHCl3 and brine
6. 6
   干燥The organic layer was dried (Na2SO4)
7. 7
   其他evaporated
8. 8
   其他chromatographed on a silica gel column (hexane/EtOAc=4/1)

实验过程

A mixture of 7 (1.08 g, 2.63 mmol), Ph3P (897 mg, 3.42 mmol) and AcOH (301 μL, 5.26 mmol) in THF (10 mL) was cooled to 0 under positive pressure of dry Ar. To this was added dropwise diethyl azodicarboxylate (2.3 M solution in toluene, 1.49 mL, 3.42 mol). After stirring for 30 min, the mixture was partitioned between CH2Cl2 and sat. aqueous NaHCO3. The organic layer was dried (Na2SO4) and evaporated. The residue was treated with K2CO3 (727 mg, 5.26 mmol) in MeOH (5 mL) for 1 h. The mixture was partitioned between CHCl3 and brine. The organic layer was dried (Na2SO4), evaporated, and chromatographed on a silica gel column (hexane/EtOAc=4/1). This gave 8 (892 mg, 83%) as an oil.

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