関与物質
| 役割 | 名称 | HCID | 仕込み量 |
|---|
| 反応物 | Diethyl Ether | HCID 3283 | — |
| 反応物 | 5-Bromo-2-chloro-3-fluoropyridine | HCID 2763285 | — |
| 反応物 | HCID 178451183 | HCID 178451183 | — |
| 触媒 | (1E,4E)-1,5-diphenylpenta-1,4-dien-3-one; palladium | HCID 6505921 | — |
| 触媒 | Ditert-butyl(cyclopenta-2,4-dien-1-yl)phosphane;iron(2+);(2,3,4,5-tetraphenylcyclopenta-1,4-dien-1-yl)benzene | HCID 129828017 | — |
| 溶媒 | Tetrahydrofuran | HCID 8028 | — |
| 生成物 | Tert-butyl 2-(6-chloro-5-fluoropyridin-3-yl)acetate | HCID 58365072 | — |
反応手順
In a sealed tube, a mixture of 5-bromo-2-chloro-3-fluoropyridine 205-1 (631 mg, 3 mmol), 0.5 M (2-tert-butoxy-2-oxoethyl) zinc(II) chloride 205-2 in ether (6.6 mL, 3.3 mmol), Pd(dba)2 (87 mg, 0.15 mmol), 1,2,3,4,5-pentaphenyl-1′-(di-t-butylphosphino)ferrocene (Q-phos, 107 mg, 0.15 mmol), and THF (12 mL) under argon was stirred at 70° C. for 18 hours. After cooled to room temperature, the solvents were evaporated and the residue was redissolved in ethyl acetate, washed with water and brine, dried over Na2SO4 and concentrated to dryness by rotary evaporation. The crude product was purified by silica gel flash chromatography, eluted with 30% ethyl acetate in hexane to give tert-butyl 2-(6-chloro-5-fluoropyridin-3-yl)acetate 205-3 as a brown oil. MS m/z 246.1 (M+1).
情報源と証拠
| DOI | 10.6084/m9.figshare.5104873.v1 |
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| 特許番号 | US09238646B2 |
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| 出典データセット | uspto-grants-2016_01 |
|---|
| ORD ID | ord-c79a005595ae44d6955ce647b9bd477f |
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| 出典メモ | uspto-grants-2016_01 |
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