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【结 构 式】

【分子编号】20324

【品名】2-(trimethylsilyl)ethyl (2R,3S)-3-phenyl-2-oxiranecarboxylate

【CA登记号】

【 分 子 式 】C14H20O3Si

【 分 子 量 】264.3965

【元素组成】C 63.6% H 7.62% O 18.15% Si 10.62%

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 synthesis of paclitaxel has been reported: The esterification of (2R,3S)-2,3-epoxy-3-phenylpropionic acid (I) with 2-(trimethylsilyl)ethanol (II) by means of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) in hot toluene gives the expected ester (III), which is treated with LiBr in acetic acid to yield the (2R,3R)-3-bromo-2-hydroxy ester (IV). The reaction of (IV) with sodium azide in hot DMF affords the corresponding azido derivative (V), which is reduced with ammonium formate or H2 over Pd/C giving the (2R,3S)-3-amino-2-hydroxy ester (VI). The amidation of (VI) with benzyl chloroformate (VII) yields the corresponding benzyloxycarbonylamino compound (VIII), which is esterified with benzoyl chloride (IX) and triethylamine affording (2R,3S)-2-(benzoyloxy)-3-(benzyloxycarbonylamino)-3-phenylpropionic acid 2-(trimethylsilyl)ethyl ester (X). The condensation of the ester (X) with 7-O-(triethylsilyl)baccatin (XI) by means of 4-(1-pyrrolidinyl)-piperidine (4-PP) and dicyclohexylcarbodiimide (DCC) in hot toluene gives the mixed ester (XII). Finally, this compound is hydrogenated with ammonium formate and Pd/C to obtain a free amino group to which the benzoyl group of the a-position is transferred by a treatment with formic acid yielding pure paclitaxel.

1 Gao, Y.; Zepp, C.M. (Sepracor Inc.); Taxol process and cpds.. US 5760251 .
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) 20322 (2R,3S)-3-phenyl-2-oxiranecarboxylic acid C9H8O3 详情 详情
(II) 20323 2-(trimethylsilyl)-1-ethanol 2916-68-9 C5H14OSi 详情 详情
(III) 20324 2-(trimethylsilyl)ethyl (2R,3S)-3-phenyl-2-oxiranecarboxylate C14H20O3Si 详情 详情
(IV) 20325 2-(trimethylsilyl)ethyl (2S,3S)-3-bromo-2-hydroxy-3-phenylpropanoate C14H21BrO3Si 详情 详情
(V) 20326 2-(trimethylsilyl)ethyl (2R,3S)-3-azido-2-hydroxy-3-phenylpropanoate C14H21N3O3Si 详情 详情
(VI) 20327 2-(trimethylsilyl)ethyl (2R,3S)-3-amino-2-hydroxy-3-phenylpropanoate C14H23NO3Si 详情 详情
(VII) 10101 Benzyloxycarbonyl chloride; Benzyl chloroformate; 1-[[(Chlorocarbonyl)oxy]methyl]benzene 501-53-1 C8H7ClO2 详情 详情
(VIII) 20329 2-(trimethylsilyl)ethyl (2R,3S)-3-[[(benzyloxy)carbonyl]amino]-2-hydroxy-3-phenylpropanoate C22H29NO5Si 详情 详情
(IX) 10463 Benzoyl chloride 98-88-4 C7H5ClO 详情 详情
(X) 20331 (1R,2S)-2-[[(benzyloxy)carbonyl]amino]-2-phenyl-1-[[2-(trimethylsilyl)ethoxy]carbonyl]ethyl benzoate C29H33NO6Si 详情 详情
(XI) 20332 (1S,2S,3R,4S,7R,9S,10S,12R,15S)-4,12-bis(acetoxy)-1,15-dihydroxy-10,14,17,17-tetramethyl-11-oxo-9-[(triethylsilyl)oxy]-6-oxatetracyclo[11.3.1.0(3,10).0(4,7)]heptadec-13-en-2-yl benzoate C37H52O11Si 详情 详情
(XII) 20333 (1S,2S,3R,4S,7R,9S,10S,12R,15S)-4,12-bis(acetoxy)-15-[((2R,3S)-2-(benzoyloxy)-3-[[(benzyloxy)carbonyl]amino]-3-phenylpropanoyl)oxy]-1-hydroxy-10,14,17,17-tetramethyl-11-oxo-9-[(triethylsilyl)oxy]-6-oxatetracyclo[11.3.1.0(3,10).0(4,7)]heptadec-13-en-2-yl benzoate C61H71NO16Si 详情 详情
Extended Information