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【结 构 式】

【分子编号】48694

【品名】4-methoxybenzaldehyde oxime

【CA登记号】

【 分 子 式 】C8H9NO2

【 分 子 量 】151.165

【元素组成】C 63.56% H 6% N 9.27% O 21.17%

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:(XXX)

Reaction of 2-(1,3-dioxol-5-yl)acetic acid (XXI) with pivaloyl chloride and TEA gives the corresponding anhydride (XXII), which is condensed with the chiral oxazolidinone (XXIII) by means of n-BuLi in THF to yield the amide (XXIV). Condensation of (XXIV) with 2-bromoacetic acid tert-butyl ester (XXV) by means of NaHMDS in THF affords the adduct (XXVI). Elimination of the chiral auxiliary of (XXVI) by means of LiOOH in THF/water provides the chiral succinic acid hemiester (XXVII) (93% ee), which is selectively reduced with BH3­THF complex to give the 4-hydroxysuccinate (XXVIII). Reaction of succinate (XXVIII) with 4-chlorophenylsulfonyl chloride, TEA and DMAP in dichloromethane yields the sulfonate (XXIX), which is condensed with 4-methoxybenzaldoxime (XXX) by means of Cs2CO3 in hot acetonitrile to afford the oxime ether (XXXI). Transesterification of the tert-butyl ester of (XXXI) with trimethyl orthoformate and p-toluenesulfonic acid in hot methanol provides the methyl ester (XXXII), which is cyclized by means of trimethylsilyl triflate and tributylamine in dichloroethane to afford a 9:1 diastereomeric mixture of perhydro-1,2-oxazines (XXXIII) and (XXXIV) which is easily separated. The reductive N-O-bond cleavage of the major oxazine diastereomer (XXXIII) by means of Zn/HOAc or H2 over Pd/C gives the trisubstituted 4-aminobutanol (XXXV), which is cyclized by means of CBr4, PPh3 and TEA to yield chiral pyrrolidine (XXXVI) (4). Finally, pyrrolidine (XXXVI) is alkylated with N,N-dibutyl-2-bromoacetamide (XIII) followed by ester hydrolysis as before.

1 Leeson, P.; Castañer, R.M.; Sorbera, L.A.; Castañer, J.; Atrasentan. Drugs Fut 2001, 26, 10, 939.
2 McLaughlin, M.A.; Wittenberger, S.J.; Preparation of endothelin antagonist ABT-627. Tetrahedron Lett 1999, 40, 7175.
3 Winn, M.; et al.; 2,4-Diarylpyrrolidine-3-carboxylic acids-potent ETA selective endothelin receptor antagonists. 1. Discovery of A-127722. J Med Chem 1996, 39, 5, 1039.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
15787 4-chlorobenzenesulfonyl chloride;4-chlorobenzene-1-sulfonyl chloride 98-60-2 C6H4Cl2O2S 详情 详情
(XIII) 20685 2-Bromo-N,N-dibutylacetamide; N,N-Dibutylbromoacetamide C10H20BrNO 详情 详情
(XXI) 18117 2-(1,3-benzodioxol-5-yl)acetic acid; 3,4-(Methylenedioxy)phenylacetic acid 2861-28-1 C9H8O4 详情 详情
(XXII) 48688 1,3-benzodioxol-5-ylacetic 1,1-dimethylpropionic anhydride C14H16O5 详情 详情
(XXIII) 12867 (4S)-4-Isopropyl-1,3-oxazolidin-2-one; (R)-4-Isopropyl-2-oxazolidinone 17016-83-0 C6H11NO2 详情 详情
(XXIV) 48689 (4S)-3-[2-(1,3-benzodioxol-5-yl)acetyl]-4-isopropyl-1,3-oxazolidin-2-one C15H17NO5 详情 详情
(XXV) 17430 2-Bromoacetic acid tert-butyl ester; tert-butyl 2-bromoacetate; tert-Butyl bromoacetate 5292-43-3 C6H11BrO2 详情 详情
(XXVI) 48690 tert-butyl (3S)-3-(1,3-benzodioxol-5-yl)-4-[(4S)-4-isopropyl-2-oxo-1,3-oxazolidin-3-yl]-4-oxobutanoate C21H27NO7 详情 详情
(XXVII) 48691 (2S)-2-(1,3-benzodioxol-5-yl)-4-(tert-butoxy)-4-oxobutyric acid C15H18O6 详情 详情
(XXVIII) 48692 tert-butyl (3S)-3-(1,3-benzodioxol-5-yl)-4-hydroxybutanoate C15H20O5 详情 详情
(XXIX) 48693 tert-butyl (3S)-3-(1,3-benzodioxol-5-yl)-4-[[(4-chlorophenyl)sulfonyl]oxy]butanoate C21H23ClO7S 详情 详情
(XXX) 48694 4-methoxybenzaldehyde oxime C8H9NO2 详情 详情
(XXXI) 48695 tert-butyl (3S)-3-(1,3-benzodioxol-5-yl)-4-([[(E)-(4-methoxyphenyl)methylidene]amino]oxy)butanoate C23H27NO6 详情 详情
(XXXII) 48696 methyl (3S)-3-(1,3-benzodioxol-5-yl)-4-([[(E)-(4-methoxyphenyl)methylidene]amino]oxy)butanoate C20H21NO6 详情 详情
(XXXIII) 48697 methyl (3R,4R,5S)-5-(1,3-benzodioxol-5-yl)-3-(4-methoxyphenyl)-1,2-oxazinane-4-carboxylate C20H21NO6 详情 详情
(XXXIV) 48698 methyl (3S,5S)-5-(1,3-benzodioxol-5-yl)-3-(4-methoxyphenyl)-1,2-oxazinane-4-carboxylate C20H21NO6 详情 详情
(XXXV) 48699 methyl (2R,3S)-2-[(R)-amino(4-methoxyphenyl)methyl]-3-(1,3-benzodioxol-5-yl)-4-hydroxybutanoate C20H23NO6 详情 详情
(XXXVI) 48700 methyl (2R,3R,4S)-4-(1,3-benzodioxol-5-yl)-2-(4-methoxyphenyl)-3-pyrrolidinecarboxylate C20H21NO5 详情 详情
Extended Information