反応 #64427

反応方程式

1-bromo-5-benzyloxy pentane

t-butyl lithium

3-bromo-phenol

n-pentyl ether

3-(benzyloxypentyl)-phenol

n-pentyl ether

→

3-(5-hydroxypentyl)-phenol

n-pentyl ether

溶媒

ethanol

tetrahydrofuran

反応条件

後処理

1. 1
   workup.STIRRINGis then stirred an additional 24 hours
2. 2
   その他before being quenched with silica gel
3. 3
   その他After removing the solvent
4. 4
   その他the mixture is chromatographed over silica gel (1:1 hexane:ether)
5. 5
   その他to yield a crude mixture
6. 6
   ろ過After filtering through celite
7. 7
   濃縮concentrating

実験手順

At a temperature of -78° C., 19.4 ml of t-butyl lithium (1.7M) is added to 4.0 gm of the above 3-bromo-phenol, n-pentyl ether in 50 mls tetrahydrofuran; and to this is added 3.3 ml of a freshly prepared solution of Li2CuCl3 (0.10M/THF). The mixture is stirred for 10 minutes, and then 4.35 grams of the 1-bromo-5-benzyloxy pentane are added. The reaction is allowed to warm slowly to ambient temperature over 12 hours and is then stirred an additional 24 hours before being quenched with silica gel. After removing the solvent, the mixture is chromatographed over silica gel (1:1 hexane:ether) to yield a crude mixture containing 3-(benzyloxypentyl)-phenol, n-pentyl ether. A solution of 6.0 gm of this crude mixture in ethanol is hydrogenated over 5% Pd on carbon for 5 hours. After filtering through celite and concentrating, pure 3-(5-hydroxypentyl)-phenol, n-pentyl ether is obtained as a clear oil by HPLC chromatography.

出典