【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% |
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 |