4-Hydroxybenzyl Alcohol → [4-(2-Piperidin-1-ylethoxy)phenyl]methanol
Reaction equation
[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH2:6][OH:7])=[CH:4][CH:3]=1.Cl.Cl[CH2:12][CH2:13][N:14]1[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]1.C([O-])([O-])=O.[K+].[K+]>>[N:14]1([CH2:13][CH2:12][O:1][C:2]2[CH:9]=[CH:8][C:5]([CH2:6][OH:7])=[CH:4][CH:3]=2)[CH2:19][CH2:18][CH2:17][CH2:16][CH2:15]1Participants
4
Procedure
Schemes IX through XII exemplify the synthesis of 2-(4-Hydroxy-phenyl)-3-methyl-1-[4-(2-piperidin-1-yl-ethoxy)-benzyl]-1H-indol-5-ol utilizing intermediates of the present invention. Scheme IIa, described above, can be considered the first step of Scheme IX or a step prior thereto. In this step 4-hydroxybenzyl alcohol is treated with a desired aryl amino alkyl chloride to afford the corresponding alkoxy benzyl alcohol. In the specific example of Scheme IIa, 4-hydroxybenzyl alcohol is treated with 1-(2-chloroethyl)-piperidine hydrochloride in the presence of K2CO3 /Me2CO to yield 4-(2-piperidinylethoxy) benzyl alcohol. Toluene and brine can be added to the resulting alcohol mixture to separate its phases. The toluene phase can then be washed successively with aqueous alkali and brine. The resulting batch can then be concentrated and ethylene dichloride added to form a solution of the intermediate, 4-(2-piperidinylethoxy) benzyl alcohol.