反应详情

To a toluene (100 ml) solution of the compound of example 62B (1.89 g, 10 mmol), Co(TPP) (0.17 g, 0.25 mmol), 1-methyl-1H-imidazole (2.39 ml, 30 mmol), and ethyl diazoacetate (1.58 ml, 15 mmol) were added and the mixture was stirred for 5 minutes at room temperature followed by additional stirring for 1.5 hours at 80° C. The reaction mixture was diluted with EtOAc and washed with saturated aqueous sodium bicarbonate. The organic layer was dried over sodium sulfate and concentrated in vacuo to give the crude product. The crude product was purified by column chromatography on silica gel, eluting with hexane/EtOAc (1:10), to give the title compound (1.34 g, 49%, trans) as a brown oil.

1. stirringby additional stirring for 1.5 hours at 80° C
2. washwashed with saturated aqueous sodium bicarbonate
3. dry with materialThe organic layer was dried over sodium sulfate
4. concentrationconcentrated in vacuo
5. customto give the crude product
6. customThe crude product was purified by column chromatography on silica gel
7. washeluting with hexane/EtOAc (1:10)