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【结 构 式】

【分子编号】10718

【品名】methyl (2S)-2-(benzoylamino)-2-phenylethanoate

【CA登记号】

【 分 子 式 】C16H15NO3

【 分 子 量 】269.30004

【元素组成】C 71.36% H 5.61% N 5.2% O 17.82%

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:(III)

A new method for the synthesis of paclitaxel side chain has been developed: The esterification of (S)-phenylglycine (I) with SOCl2 and methanol gives the corresponding methyl ester (II), which is acylated with benzoyl chloride and pyridine to the benzoyl derivative (III). The reduction of (III) with dibutylaluminum hydride (DIBAL) in toluene yields the corresponding aldehyde (IV), which is condensed with 2-(trimethylsilyl)thiazole (V) by means of tetrabutylammonium fluoride (TBAF) to afford the (1R,2S)-N-[2-hydroxy-1-phenyl-2-(2-thiazolyl)ethyl]benzamide (VI) with a 95% enantiomeric purity. The cyclization of (VI) with 2,2-dimethoxypropane (VII) catalyzed by camphosulfonic acid (CSA) gives (4S,5R)-3-benzoyl-2,2-dimethyl-4-phenyl-5-(2-thiazolyl)oxazolidine (VIII), which is treated with methyl trifluoromethanesulfonate to afford (4S,5R)-3-benzoyl-2,2-dimethyl-4-phenyloxazolidine-5-carbaldehyde (IX). Finally, this compound is oxidized with KMnO4 in tert-butanol/aqueous potassium phosphate buffer to yield (4S,5R)-3-benzoyl-2,2-dimethyl-4-phenyloxazolidine-5-carboxylic acid (X), the side chain of paclitaxel suitably protected.

1 Semola, T.; Dondoni, A.; Perrone, D.; Synthesis of Taxol and Taxotere side chains by 2-(trimethylsilyl)thiazole based homologation of L-phenylglycine. Synthesis 1995, 2, 2, 181.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
10463 Benzoyl chloride 98-88-4 C7H5ClO 详情 详情
(I) 10716 (2S)-2-Amino-2-phenylethanoic acid; L-(+)-alpha-Phenylglycine 2935-35-5 C8H9NO2 详情 详情
(II) 10717 methyl (2S)-2-amino-2-phenylethanoate C9H11NO2 详情 详情
(III) 10718 methyl (2S)-2-(benzoylamino)-2-phenylethanoate C16H15NO3 详情 详情
(IV) 10719 N-[(1S)-2-Oxo-1-phenylethyl]benzamide C15H13NO2 详情 详情
(V) 10720 2-(Trimethylsilyl)-1,3-thiazole 79265-30-8 C6H11NSSi 详情 详情
(VI) 10721 N-[(1S,2R)-2-Hydroxy-1-phenyl-2-(1,3-thiazol-2-yl)ethyl]benzamide C18H16N2O2S 详情 详情
(VII) 10722 1-Methoxy-1-methylethyl methyl ether; 2,2-Dimethoxypropane 77-76-9 C5H12O2 详情 详情
(VIII) 10723 [(4S,5R)-2,2-Dimethyl-4-phenyl-5-(1,3-thiazol-2-yl)-1,3-oxazolidin-3-yl](phenyl)methanone C21H20N2O2S 详情 详情
(IX) 10724 (4S,5R)-3-Benzoyl-2,2-dimethyl-4-phenyl-1,3-oxazolidine-5-carbaldehyde C19H19NO3 详情 详情
(X) 10725 (4S,5R)-3-Benzoyl-2,2-dimethyl-4-phenyl-1,3-oxazolidine-5-carboxylic acid C19H19NO4 详情 详情
Extended Information