反应详情

Glacial acetic acid (16 ml) was added dropwise during 0.25 h to a stirred solution of 3-(2-thiazolyl)-2-propynol (2.4 g) and dipotassium azodicarboxylate (50 g) in pyridine (200 ml). The mixture was stirred at room temperature for 1 h and additional glacial acetic acid (40 ml) added during 0.5 h. The mixture was stirred at room temperature for 2 days. The solvent was removed by azeotropic distillation with toluene (2×100 ml) and the residue partitioned between water (100 ml) and ethyl acetate (100 ml). The aqueous layer was extracted with ethyl acetate (2×50 ml) and the combined extracts dried and evaporated to leave a brown oil. This was purified by FCC eluting with toluene:ethyl acetate:triethylamine (50:50:1) to give the title compound as an orange oil (1.45 g), t.l.c. (toluene:ethyl acetate:triethylamine 50:50:1) Rf 0.15.

1. stirringThe mixture was stirred at room temperature for 2 days
2. customThe solvent was removed by azeotropic distillation with toluene (2×100 ml)
3. customthe residue partitioned between water (100 ml) and ethyl acetate (100 ml)
4. extractionThe aqueous layer was extracted with ethyl acetate (2×50 ml)
5. customthe combined extracts dried
6. customevaporated
7. customto leave a brown oil
8. customThis was purified by FCC
9. washeluting with toluene:ethyl acetate:triethylamine (50:50:1)