反応 #168745

反応方程式

2-[2-(3-bromo-phenyl)-2-oxo-ethoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester

AlMe3

heptane

MeLi

Et2O

→

title compound

2-[2-(3-Bromo-phenyl)-2-hydroxy-propoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester

溶媒

toluene

反応条件

後処理

1. 1
   抽出was extracted with EtOAc
2. 2
   洗浄Combined organic layers were washed with brine
3. 3
   乾燥dried over MgSO4
4. 4
   ろ過filtered
5. 5
   その他evaporated
6. 6
   その他The crude product was purified by flash-chromatography on silica gel (toluene to toluene/EtOAc 10:1)
7. 7
   その他to provide

実験手順

To a solution of 2-[2-(3-bromo-phenyl)-2-oxo-ethoxy]-3,3,3-trifluoro-2-methyl-propionic acid methyl ester (6.6 g, 17 mmol) in toluene (120 ml) was added under argon at −78° C. a 2M solution of AlMe3 in heptane (17 ml, 34 mmol) and after stirring for 0.5 h at −78° C. a 1.6 M solution of MeLi in Et2O (21.3 ml, 34 mmol) over a period of 40 min. After stirring for 0.5 h at −78° C. the reaction mixture was added to a cold aqueous NaH2PO4 solution and was extracted with EtOAc. Combined organic layers were washed with brine, dried over MgSO4, filtered and evaporated. The crude product was purified by flash-chromatography on silica gel (toluene to toluene/EtOAc 10:1) to provide a diastereomeric mixture of the title compound as a yellow oil: TLC (toluene/EtOAc 10:1): Rf=0.34 and 0.37; HPLC RtH5=1.359 min; 1H NMR (360 MHz, CDCl3): δ 7.69 (m, 1H), 7.43 (m, 2H), 7.25 (t, 1H), 3.86 (s, 3H), 3.68 (m, 2H), 3.43 and 3.33 (s, 1H), 1.63 and 1.61 (s, 3H), 1.58 (s, 3H); ESIMS: 402, 404 [(M+NH4)+].

出典