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【结 构 式】

【分子编号】34405

【品名】(2R)-2-(3-methoxybenzyl)butyric acid

【CA登记号】

【 分 子 式 】C12H16O3

【 分 子 量 】208.25724

【元素组成】C 69.21% H 7.74% O 23.05%

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 acylation of (S,S)-pseudoephedrine (I) with butyric anhydride (II) gave the corresponding butyramide (III), which was asymmetrically alkylated with m-methoxybenzyl bromide (IV) in the presence of LDA and LiCl in THF at low temperature to produce the (S,S,R) isomer (V). Amide hydrolysis of (V) to provide the (R)-carboxylic acid (VI) was effected according to a described procedure by treatment with methanesulfonic acid in boiling THF, and then with lithium borohydride and tetrabutylammonium hydroxide. Further treatment of (VI) with ethereal diazomethane afforded the methyl ester (VII). This was submitted to acyloin condensation using Na metal and trimethylsilyl chloride to form the corresponding acyloin as the bis(silyl) ether (VIII). Double cyclization of (VIII) using TiCl4 at low temperature yielded the required tetrahydrochrysene system with minimal epimerization. The major cis isomer (IX) was then isolated by flash chromatography. Finally, deprotection of the methyl ethers of (IX) with BBr3 furnished the title bis-phenolic compound.

1 Meyers, M.J.; et al.; Estrogen receptor subtype-selective ligands: Asymmetric synthesis and biological evaluation of cis- and trans-5,11-dialkyl-5,6,11,12-tetrahydrochrysenes. J Med Chem 1999, 42, 13, 2456.
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) 34409 (1S,2S)-2-(methylamino)-1-phenyl-1-propanol 90-82-4 C10H15NO 详情 详情
(II) 25047 butyric anhydride 106-31-0 C8H14O3 详情 详情
(III) 34402 N-[(1S,2S)-2-hydroxy-1-methyl-2-phenylethyl]-N-methylbutanamide C14H21NO2 详情 详情
(IV) 34403 1-(bromomethyl)-3-methoxybenzene; 3-(bromomethyl)phenyl methyl ether C8H9BrO 详情 详情
(V) 34404 (2R)-N-[(1S,2S)-2-hydroxy-1-methyl-2-phenylethyl]-2-(3-methoxybenzyl)-N-methylbutanamide C22H29NO3 详情 详情
(VI) 34405 (2R)-2-(3-methoxybenzyl)butyric acid C12H16O3 详情 详情
(VII) 34406 methyl (2R)-2-(3-methoxybenzyl)butanoate C13H18O3 详情 详情
(VIII) 34407 3-[(2R,3E,5R)-2-ethyl-5-(3-methoxybenzyl)-3,4-bis[(trimethylsilyl)oxy]-3-heptenyl]phenyl methyl ether; (E)-4,5-bis[(1R)-1-(3-methoxybenzyl)propyl]-2,2,7,7-tetramethyl-3,6-dioxa-2,7-disila-4-octene C30H48O4Si2 详情 详情
(IX) 34408 (5R,11R)-5,11-diethyl-8-methoxy-5,6,11,12-tetrahydro-2-chrysenyl methyl ether; (5R,11R)-5,11-diethyl-2,8-dimethoxy-5,6,11,12-tetrahydrochrysene C24H28O2 详情 详情
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