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【结 构 式】

【分子编号】58058

【品名】5-[(4S)-2,2-dimethyl-1,3-dioxan-4-yl]pentanal

【CA登记号】

【 分 子 式 】C11H20O3

【 分 子 量 】200.278

【元素组成】C 65.97% H 10.07% O 23.97%

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:(XXXVI)

A further procedure utilized the (S)-keto ester (XXXI) as the chiral starting material. Baeyer-Villiger oxidation of cyclohexanone (XXXI) with m-CPBA in the presence of a phosphate buffer at pH 8 provided two regioisomeric chiral lactones (XXXII) and (XXXIII), which were separated by column chromatography. The major isomer (XXXII) was subsequently reduced with LiAlH4 to furnish triol (XXXIV). The 1,3-dihydroxy moiety of (XXXIV) was then protected as the acetonide derivative (XXXV) employing 2,2-dimethoxypropane. The requisite ester (XXXVII) was prepared by stepwise oxidation of the primary alcohol (XXXV) to the aldehyde (XXXVI) using pyridinium dichromate, and then to the corresponding carboxylic acid with m-CPBA, followed by esterification with ethereal diazomethane to (XXXVII). Hydrolysis of the acetonide (XXXVII) by means of p-toluenesulfonic acid in methanol led to the target intermediate, the dihydroxy ester (XIII).

1 Ganaha, M.; et al.; Synthesis of methyl (S)-(-)-6,8-dihydroxyoctanoate as a precursor of (R)-(+)-alpha-lipoic acid. Biosci Biotechnol Biochem 1999, 63, 11, 2025.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(XIII) 57977 methyl (6S)-6,8-dihydroxyoctanoate C9H18O4 详情 详情
(XXXI) 58053 methyl 2-[(1S)-2-oxocyclohexyl]acetate C9H14O3 详情 详情
(XXXII) 58054 methyl 2-[(2S)-7-oxooxepanyl]acetate C9H14O4 详情 详情
(XXXIII) 58055 methyl 2-[(3S)-2-oxooxepanyl]acetate C9H14O4 详情 详情
(XXXIV) 58056 (3S)-1,3,8-octanetriol C8H18O3 详情 详情
(XXXV) 58057 5-[(4S)-2,2-dimethyl-1,3-dioxan-4-yl]-1-pentanol C11H22O3 详情 详情
(XXXVI) 58058 5-[(4S)-2,2-dimethyl-1,3-dioxan-4-yl]pentanal C11H20O3 详情 详情
(XXXVII) 58037 methyl 5-[(4S)-2,2-dimethyl-1,3-dioxan-4-yl]pentanoate C12H22O4 详情 详情
Extended Information