Preparation method of 2-(5-bromo-2-methylbenzyl)-5-(4-fluorophenyl)thiophene
A technology of methyl benzyl and methyl phenyl, applied in the field of medicinal chemistry, can solve the problems of high cost, low yield and complex process of the preparation method, and achieve the effects of easy purification, environmental friendliness and simple operation
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Embodiment 1
[0039] Example 1 Preparation of 2-(4-fluorophenyl)thiophene III:
[0040]
[0041] Grignard reagent preparation: N 2 Under protection, magnesium chips (11.7g, 480mmol), THF (15.0mL) were added to a 500mL three-necked flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, 2 drops of p-fluorobromobenzene, and 2 capsules of After iodine is heated to initiate the reaction, dissolve p-fluorobromobenzene (70.0g, 400mmol) in THF (250mL), then add the THF solution of p-fluorobromobenzene dropwise under heating and reflux, keep warm and reflux for 2h after dropping, and detect the conversion of raw materials by GC completely.
[0042] Coupling reaction: N 2Under protection, 2-bromothiophene (52.2g, 320mmol) was added to a 1000mL three-necked flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, and bis(acetylacetonate)palladium (23.4mg, 0.0320mmol) was added under stirring. , THF (200mL), heated to...
Embodiment 2
[0043] Example 2 Preparation of 2-(4-fluorophenyl)thiophene III:
[0044]
[0045] Grignard reagent preparation: N 2 Under protection, magnesium chips (11.7g, 480mmol), THF (15.0mL) were added to a 500mL three-neck flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, 2 drops of p-fluorobromobenzene, and 2 capsules of After iodine is heated to initiate the reaction, dissolve p-fluorobromobenzene (70.0g, 400mmol) in THF (250mL), then add the THF solution of p-fluorobromobenzene dropwise under heating and reflux, keep warm and reflux for 2h after dropping, and detect the conversion of raw materials by GC completely.
[0046] Coupling reaction: N 2 Under protection, 2-bromothiophene (52.2g, 320mmol) was added to a 1000mL three-neck flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, and PdCl was added under stirring. 2 (dppf) (23.4mg, 0.0320mmol), THF (200mL), heated up to 50°C, then added...
Embodiment 3
[0047] Example 3 Preparation of 2-(4-fluorophenyl)thiophene III:
[0048]
[0049] Grignard reagent preparation: N 2 Under protection, magnesium chips (11.7g, 480mmol), THF (15.0mL) were added to a 500mL three-neck flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, 2 drops of p-fluorobromobenzene, and 2 capsules of After iodine is heated to initiate the reaction, dissolve p-fluorobromobenzene (70.0g, 400mmol) in THF (250mL), then add the THF solution of p-fluorobromobenzene dropwise under heating and reflux, keep warm and reflux for 2h after dropping, and detect the conversion of raw materials by GC completely.
[0050] Coupling reaction: N 2 Under protection, 2-bromothiophene (52.2g, 320mmol) was added to a 1000mL three-neck flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, and PdCl was added under stirring. 2 (dppf) (23.4mg, 0.0320mmol), THF (200mL), heated up to 50°C, then added...
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