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【结 构 式】

【分子编号】30412

【品名】methyl 2-(2-[4-[(R)-(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetate

【CA登记号】

【 分 子 式 】C22H27ClN2O3

【 分 子 量 】402.92076

【元素组成】C 65.58% H 6.75% Cl 8.8% N 6.95% O 11.91%

与该中间体有关的原料药合成路线共 2 条

合成路线1

该中间体在本合成路线中的序号:(XIV)

In a further procedure, racemic (4-chlorophenyl)phenylmethyl amine (V) was resolved by means of L-tartaric acid. The undesired (S)-enantiomer (VII) could be recovered by racemization to (V) upon treatment with 2-hydroxybenzaldehyde and NaOMe. The required (R)-enantiomer (VI) was condensed with N,N-bis(chloroethyl)-p-toluenesulfonamide (VIII) in refluxing diisopropylethylamine to provide the N-tosyl piperazine (IX). Deprotection of the p-toluenesulfonamide of (IX) was achieved by treatment with HBr in the presence of 4-hydroxybenzoic acid. The resulting piperazine (X) was alkylated with either (2-chloroethoxy)acetamide (XI) or methyl (2-chloroethoxy)acetate (XIII), affording the N-alkylated piperazines (XII) and (XIV), respectively. The title carboxylic acid was then obtained by hydrolysis of amide (XII) with aqueous HCl or, alternatively, by hydrolysis of ester (XIV) with ethanolic KOH.

1 Bodson, G.; Gobert, J.; Cossement, E. (UCB SA); Enantiomers of 1-[4-(chlorophenyl)phenylmethyl]-4-(methylphenyl)sulfonyl piperazine. EP 0617028 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(V) 30407 p-Chloro benzhydryl amine; (4-Chlorophenyl)(phenyl)methylamine; (4-Chlorophenyl)(phenyl)methanamine C13H12ClN 详情 详情
(VI) 30408 (R)-(4-chlorophenyl)(phenyl)methylamine; (R)-(4-chlorophenyl)(phenyl)methanamine C13H12ClN 详情 详情
(VII) 30413 (S)-(4-chlorophenyl)(phenyl)methylamine; (S)-(4-chlorophenyl)(phenyl)methanamine C13H12ClN 详情 详情
(VIII) 30409 N,N-bis(2-chloroethyl)-4-methylbenzenesulfonamide 42137-88-2 C11H15Cl2NO2S 详情 详情
(IX) 30410 1-[(R)-(4-chlorophenyl)(phenyl)methyl]-4-[(4-methylphenyl)sulfonyl]piperazine C24H25ClN2O2S 详情 详情
(X) 30404 1-[(R)-(4-chlorophenyl)(phenyl)methyl]piperazine C17H19ClN2 详情 详情
(XI) 16839 2-(2-chloroethoxy)acetamide C4H8ClNO2 详情 详情
(XII) 30411 2-(2-[4-[(R)-(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetamide C21H26ClN3O2 详情 详情
(XIII) 16841 methyl 2-(2-chloroethoxy)acetate C5H9ClO3 详情 详情
(XIV) 30412 methyl 2-(2-[4-[(R)-(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetate C22H27ClN2O3 详情 详情

合成路线2

该中间体在本合成路线中的序号:(V)

The reaction of racemic cetiricine (I) with SOCl2 in toluene gives the acyl chloride (II), which is treated with ammonia to yield the corresponding racemic amide (III). The optical resolution of (III) by preparative chiral chromatography on a Chiralpak AD column affords the (R)-isomer (IV), which is treated with HCl in refluxing methanol to provide the chiral methyl ester (V). Finally, ester (V) is hydrolyzed with aqueous HCl to provide the chiral target compound. The hydrolysis of amide (IV) is not performed directly to the target acid owing to purification problems (separation of the ammonium chloride formed in the hydrolysis with HCl).

1 Pflum, D.A.; et al.; A large-scale synthesis of enantiomerically pure cetirizine dihydrochloride using preparative chiral HPLC. Org Process Res Dev 2001, 5, 2, 110.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 46613 2-(2-[4-[(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetic acid C21H25ClN2O3 详情 详情
(II) 46614 2-(2-[4-[(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetyl chloride C21H24Cl2N2O2 详情 详情
(III) 46615 2-(2-[4-[(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetamide C21H26ClN3O2 详情 详情
(IV) 30411 2-(2-[4-[(R)-(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetamide C21H26ClN3O2 详情 详情
(V) 30412 methyl 2-(2-[4-[(R)-(4-chlorophenyl)(phenyl)methyl]-1-piperazinyl]ethoxy)acetate C22H27ClN2O3 详情 详情
Extended Information