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【结 构 式】

【分子编号】57837

【品名】ethyl 4-{[(benzyloxy)carbonyl]amino}-2,2-difluoro-5-phenylpentanoate

【CA登记号】

【 分 子 式 】C21H23F2NO4

【 分 子 量 】391.4147664

【元素组成】C 64.44% H 5.92% F 9.71% N 3.58% O 16.35%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(VI)

The intermediate 4-amino-N-benzyl-2,2-difluoro-5-phenylpentanamide (IX) has been obtained as follows. The esterification of N-(benzyloxycarbonyl)-DL-phenylalanine (I) with methyl iodide and KHCO3 in DMF gives the corresponding methyl ester (II), which is reduced with LiCl and NaBH4 in THF to yield protected DL-phenylalaninol (III). The oxidation of (III) by means of 2,2,6,6-tetramethylpiperdine-1-oxyl free radical (TEMPO), NaBr and NaClO in ethyl acetate/toluene affords protected DL-phenylalaninal (IV), which is condensed with ethyl 2-bromo-2,2-difluoroacetate (V) by means of Zn in THF to provide the 2,2-difluoropentanoic ester (VI). The reaction of ester (VI) with benzylamine (VII) in THF gives the corresponding amide (VIII), which is finally deprotected by means of H2 over Pd/C in methanol/dioxane to yield the target 4-amino-N-benzyl-2,2-difluoro-5-phenylpentanamide (IX) intermediate.

1 Kobayashi, F.; Naito, K.; Yoshikawa, T.; Kuwahara, S.; Imada, T.; Komorita, N. (Mitsubishi Pharma Corp.); IgE antibody production inhibitors and autoimmune diseases inhibitors. EP 1062949; US 6528514; WO 9945928 .
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) 58077 N-[(benzyloxy)carbonyl]phenylalanine C17H17NO4 详情 详情
(II) 57836 methyl 2-{[(benzyloxy)carbonyl]amino}-3-phenylpropanoate C18H19NO4 详情 详情
(III) 58078 benzyl 1-benzyl-2-hydroxyethylcarbamate C17H19NO3 详情 详情
(IV) 48629 benzyl 1-benzyl-2-oxoethylcarbamate; N-(benzyloxycarbonyl)-L-phenylalaninal 59830-60-3 C17H17NO3 详情 详情
(V) 40673 ethyl 2-bromo-2,2-difluoroacetate; Ethylbromodifluoroacetate; 2-bromo-2,2-difluoroacetic acid ethyl ester; bromodifluoroacetic acid ethyl ester 667-27-6 C4H5BrF2O2 详情 详情
(VI) 57837 ethyl 4-{[(benzyloxy)carbonyl]amino}-2,2-difluoro-5-phenylpentanoate C21H23F2NO4 详情 详情
(VII) 15147 Benzylamine; Phenylmethanamine 100-46-9 C7H9N 详情 详情
(VIII) 57838 benzyl 1-benzyl-4-(benzylamino)-3,3-difluoro-4-oxobutylcarbamate C26H26F2N2O3 详情 详情
(IX) 57839 4-amino-N-benzyl-2,2-difluoro-5-phenylpentanamide C18H20F2N2O 详情 详情
Extended Information