|
【结 构 式】 
|
【分子编号】10457 【品名】(3R,4S)-1-(4-methoxyphenyl)-2-oxo-4-phenylazetanyl acetate 【CA登记号】 |
【 分 子 式 】C18H17NO4 【 分 子 量 】311.33732 【元素组成】C 69.44% H 5.5% N 4.5% O 20.56% |
合成路线1
该中间体在本合成路线中的序号：(III)A new partial synthesis for taxol has been reported: The cyclization of N-(4-methoxyphenyl)benzylideneimine (I) with acetoxyacetyl chloride (II) by means of triethylamine in dichloromethane gives cis-3-acetoxy-1-(4-methoxyphenyl)-4-phenylazetidin-2-one (III), which is treated with ceric ammonium nitrate in acetonitrile to afford cis-3-acetoxy-4-phenylazetidin-2-one (IV). Hydrolysis of (IV) with KOH in THF-water yields cis-3-hydroxy-4-phenylazetidin-2-one (V), which is submitted to optical resolution giving the (3R,4S)-isomer (VI). The reaction of (VI) with ethyl vinyl ether (VII) by means of methanesulfonic acid in THF affords (3R,4S)-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one (VIII), which is benzoylated with benzoyl chloride (IX) and butyllithium in hexane to give (X). Opening of the azetidine ring of (X) with KOH in THF-water gives (2R,3S)-3-(benzamido)-2-(1-ethoxyethoxy)propanoic acid (XI), which is cyclized with potassium tert-butoxide and methanesulfonyl chloride to (4S,5R)-5-(1-ethoxyethoxy)-2,4-diphenyl-5,6-dihydro-4H-1,3-oxazin-6-one (XII). Finally, this compound is condensed with 7-O-(triethylsilyl)baccatin III (XIV) [prepared from 10-deacetylbaccatin III (XIII) by successive reaction with triethylsilyl chloride and acetyl chloride] by means of dimethylaminopyridine (DMAP) in pyridine.
| 【1】 Holton, R.A. (University of Florida); Method for preparation of taxol using an oxazinone. US 5015744 . |
| 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) | 10455 | N-(4-Methoxyphenyl)-N-[(Z)-benzylidene]amine; 4-Methoxy-N-[(Z)-benzylidene]aniline | 783-08-4 | C14H13NO | 详情 | 详情 |
| (II) | 10456 | Acetoxiacetil chloride; 2-chloro-2-oxoethyl acetate | 13831-31-7 | C4H5ClO3 | 详情 | 详情 |
| (III) | 10457 | (3R,4S)-1-(4-methoxyphenyl)-2-oxo-4-phenylazetanyl acetate | C18H17NO4 | 详情 | 详情 | |
| (IV) | 10458 | (3R,4S)-2-oxo-4-phenylazetanyl acetate | C11H11NO3 | 详情 | 详情 | |
| (V) | 63030 | cis-3-Hydroxy-4-phenyl-2-azetanone; (3R*,4S*)-3-Hydroxy-4-phenyl-2-azetanone | C9H9NO2 | 详情 | 详情 | |
| (VI) | 10459 | (3R,4S)-3-Hydroxy-4-phenyl-2-azetanone | C9H9NO2 | 详情 | 详情 | |
| (VII) | 18762 | 1-Ethoxyethylene; Ethyl vinyl ether；Ethoxyethene | 109-92-2 | C4H8O | 详情 | 详情 |
| (VIII) | 10462 | (3R,4S)-3-(1-Ethoxyethoxy)-4-phenyl-2-azetanone | C13H17NO3 | 详情 | 详情 | |
| (IX) | 10463 | Benzoyl chloride | 98-88-4 | C7H5ClO | 详情 | 详情 |
| (X) | 10464 | (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetanone | C20H21NO4 | 详情 | 详情 | |
| (XI) | 10465 | (2R,3S)-3-(Benzoylamino)-2-(1-ethoxyethoxy)-3-phenylpropionic acid | C20H23NO5 | 详情 | 详情 | |
| (XII) | 10466 | (4S,5R)-5-(1-Ethoxyethoxy)-2,4-diphenyl-4,5-dihydro-6H-1,3-oxazin-6-one | C20H21NO4 | 详情 | 详情 | |
| (XIII) | 10467 | (1S,2S,3R,4S,7R,9S,10S,12R,15S)-4-(acetoxy)-1,9,12,15-tetrahydroxy-10,14,17,17-tetramethyl-11-oxo-6-oxatetracyclo[11.3.1.0(3,10).0(4,7)]heptadec-13-en-2-yl benzoate | 32981-86-5 | C29H36O10 | 详情 | 详情 |
| (XIV) | 10468 | (1S,2S,3R,4S,7R,9R,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 |
合成路线2
该中间体在本合成路线中的序号：(III)A new synthesis of paclitaxel has been reported: The cyclization of the 4-methoxyphenylimine of benzaldehyde (I) with acetoxyacetyl chloride (II) by means of triethylamine gives cis-3-acetoxy-1-(4-methoxyphenyl)-4-phenylazetidin-2-one (III), which is treated with ceric ammonium nitrate to afford cis-3-acetoxy-4-phenylazetidin-2-one (IV). The hydrolysis of (IV) with KOH in THF/water affords the corresponding hydroxy compound (V), which is submitted to optical resolution by crystallization of the 2-methoxy-2-[2-(trifluoromethyl)phenyl]acetic esters. The (3R,4S)-regioisomer (VI) is protected with ethyl vinyl ether, giving the 1-ethoxyethyl derivative (VII), which is benzoylated with benzoyl chloride and butyllithium to afford (3R,4S)-1-benzoyl-3-(1-ethoxyethoxy)-4-phenylazetidin-2-one (VIII). The condensation of (VIII) with baccatin III (IX) by means of dimethylaminopyridine (DMAP) in pyridine yields the protected paclitaxel derivative (X), which is finally deprotected with HCl in ethanol/water.
| 【1】 Holton, R.A. (University of Florida); Method for preparation of taxol. EP 0400971; US 5336785 . |
| 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) | 10455 | N-(4-Methoxyphenyl)-N-[(Z)-benzylidene]amine; 4-Methoxy-N-[(Z)-benzylidene]aniline | 783-08-4 | C14H13NO | 详情 | 详情 |
| (II) | 10456 | Acetoxiacetil chloride; 2-chloro-2-oxoethyl acetate | 13831-31-7 | C4H5ClO3 | 详情 | 详情 |
| (III) | 10457 | (3R,4S)-1-(4-methoxyphenyl)-2-oxo-4-phenylazetanyl acetate | C18H17NO4 | 详情 | 详情 | |
| (IV) | 10458 | (3R,4S)-2-oxo-4-phenylazetanyl acetate | C11H11NO3 | 详情 | 详情 | |
| (V) | 63030 | cis-3-Hydroxy-4-phenyl-2-azetanone; (3R*,4S*)-3-Hydroxy-4-phenyl-2-azetanone | C9H9NO2 | 详情 | 详情 | |
| (VI) | 10459 | (3R,4S)-3-Hydroxy-4-phenyl-2-azetanone | C9H9NO2 | 详情 | 详情 | |
| (VII) | 10462 | (3R,4S)-3-(1-Ethoxyethoxy)-4-phenyl-2-azetanone | C13H17NO3 | 详情 | 详情 | |
| (VIII) | 10464 | (3R,4S)-1-Benzoyl-3-(1-ethoxyethoxy)-4-phenyl-2-azetanone | C20H21NO4 | 详情 | 详情 | |
| (IX) | 10473 | (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 | |
| (X) | 10505 | (1S,2S,3R,4S,7R,9S,10S,12R,15S)-4,12-bis(acetoxy)-15-[[(2R,3S)-3-(benzoylamino)-2-(1-ethoxyethoxy)-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 | C57H73NO15Si | 详情 | 详情 |