反应详情

温度

-70 °C

Thiazole-4-carbonitrile (1035 mg, 9397 μmol) was azeotroped with toluene. Et2O was added, and the clear solution was cooled to −70° C., followed by addition of titanium tetraisopropoxide (3025 μl, 10337 μmol), and ethylmagnesium bromide (6265 μl, 18795 μmol). The reaction mixture turned yellow. It remained yellow until about 15 min. The reaction was raised to RT, the solution changed into black. After 1 h., boron trifluoride diethyl etherate (2361 μl, 18795 μmol) was added and stirred for 1.5 hr. Then 1N HCl 27 mL was added, followed by 100 mL ether, 95 mL 10% NaOH. The reaction was extracted with Et2O×2 and 30% IPA/CHCl3×1. The organic layer was concentrated and purified with silica gel chromatography using 0-10% MeOH/DCM. 650 mg of product 14.2.B was obtained in 49% yield.

1. temperatureThe reaction was raised to RT
2. waitAfter 1 h.
3. extractionThe reaction was extracted with Et2O×2 and 30% IPA/CHCl3×1
4. concentrationThe organic layer was concentrated
5. custompurified with silica gel chromatography