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【结 构 式】 
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【分子编号】46311 【品名】3-([(1R)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-oxoethyl]oxy)propyl pivalate 【CA登记号】 |
【 分 子 式 】C15H26O6 【 分 子 量 】302.36784 【元素组成】C 59.58% H 8.67% O 31.75% |
合成路线1
该中间体在本合成路线中的序号：(XL)Preparation of the allyl alcohol precursor (XXX) was further reported by an alternative method described in the two following schemes: The symmetrical epoxide (XXXV) was cleaved by 1,3-propanediol (II) in the presence of potassium tert-butoxide to give the diol (XXXVI). After protection of the primary alcohol of (XXXVI) as the pivalate ester (XXXVII), the benzyl ether groups of (XXXVII) were removed by hydrogenation in the presence of palladium hydroxide to provide (XXXVIII). Protection of the vicinal diol moiety of (XXXVII) as the corresponding acetonide (XXXIX) was achieved by treatment with 2,2-dimethoxypropane and p-TsOH. Subsequent Swern oxidation of the primary alcohol function of (XXXIX) gave aldehyde (XL). Addition of vinylmagnesium bromide to aldehyde (XL) afforded the allylic alcohol (XLI) as a diastereomeric mixture. Esterification of (XLI) with pivaloyl chloride provided dipivalate ester (XLII). Epoxide (XLIII) was then prepared by acidic acetonide (XLII) hydrolysis, followed by cyclization of the resultant vicinal diol under Mitsunobu conditions to afford epoxide (XLIII). Addition of the O-protected lithium acetylide (XLIV) to epoxide (XLIII) furnished the acetylene adduct (XLV)
| 【1】 Hatakeyama, S.; Ikeda, T.; Maeyama, J.; Esumi, T.; Iwabuchi, Y.; Irie, H.; Convergent synthesis of 1alpha, 25-dihydroxy-2beta-(3-hydroxypropoxy)vitamin D3 (ED-71). Bioorg Med Chem Lett 1997, 7, 22, 2871. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (II) | 14685 | 1,3-propanediol; Trimethylene Glycol | 504-63-2 | C3H8O2 | 详情 | 详情 |
| (XXXV) | 25266 | benzyl [(2S,3S)-3-[(benzyloxy)methyl]oxiranyl]methyl ether; (2S,3S)-2,3-bis[(benzyloxy)methyl]oxirane | C18H20O3 | 详情 | 详情 | |
| (XXXVI) | 46308 | (2R,3S)-1,4-bis(benzyloxy)-3-(3-hydroxypropoxy)-2-butanol | C21H28O5 | 详情 | 详情 | |
| (XXXVII) | 46309 | 3-([(1S,2R)-3-(benzyloxy)-1-[(benzyloxy)methyl]-2-hydroxypropyl]oxy)propyl pivalate | C26H36O6 | 详情 | 详情 | |
| (XXXVIII) | 59880 | 3-{[(1S,2R)-2,3-dihydroxy-1-(hydroxymethyl)propyl]oxy}propyl pivalate | C12H24O6 | 详情 | 详情 | |
| (XXXIX) | 46310 | 3-([(1S)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-hydroxyethyl]oxy)propyl pivalate | C15H28O6 | 详情 | 详情 | |
| (XL) | 46311 | 3-([(1R)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-oxoethyl]oxy)propyl pivalate | C15H26O6 | 详情 | 详情 | |
| (XLI) | 46312 | 3-([(1S)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-hydroxy-3-butenyl]oxy)propyl pivalate | C17H30O6 | 详情 | 详情 | |
| (XLII) | 59883 | 3-({(1R)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-[(2,2-dimethylpropanoyl)oxy]-3-butenyl}oxy)propyl pivalate | C22H38O7 | 详情 | 详情 | |
| (XLIII) | 46314 | 3-([(1R)-2-[(2,2-dimethylpropanoyl)oxy]-1-[(2R)oxiranyl]-3-butenyl]oxy)propyl pivalate | C19H32O6 | 详情 | 详情 | |
| (XLIV) | 59881 | {3-[(4-methoxybenzyl)oxy]-1-propynyl}lithium | C11H11LiO2 | 详情 | 详情 | |
| (XLV) | 59882 | 3-({(1R,2R)-1-{1-[(2,2-dimethylpropanoyl)oxy]-2-propenyl}-2-hydroxy-6-[(4-methoxybenzyl)oxy]-4-hexynyl}oxy)propyl pivalate | C30H44O8 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XIX)The A ring fragment (XXV) was synthesized as follows. Ring opening of epoxide (XIII) with 1,3-propanediol (XIV) in the presence of potassium tert-butoxide afforded the hydroxy ether (XV). The primary alcohol group of (XV) was then esterified with pivaloyl chloride (XVI) in the presence of pyridine to give (XVII). After hydrogenolysis of the benzyl ethers of (XVII), the 1,2-diol moiety was protected as the corresponding acetonide (XVIII) by means of 2,2-dimethoxypropane. Swern oxidation of the free alcohol group of (XVIII) generated aldehyde (XIX), and subsequent addition of vinylmagnesium bromide to (XIX) provided the allylic alcohol (XX) as a diastereomeric mixture. After protection of the hydroxyl group of (XX) as the pivalate ester, acid hydrolysis of the acetonide furnished diol (XXI). This was then converted to epoxide (XXII) under Mitsunobu conditions. Addition of lithium trimethylsilylacetylide (XXIII) to the epoxide (XXII) and then hydrolysis of the pivalate esters yielded (XXIV). This compound was protected as the tris(tert-butyldimethylsilyl) ether, and the diastereomeric mixture was separated by flash chromatography to provide intermediate (XXV).
| 【1】 Hatakeyama, S.; et al.; Synthesis and biological characterization of 1alpha,24,25-trihydroxy-2beta-(3-hydroxypropoxy)vitamin D3 (24-hydroxylated ED-71). Steroids 2001, 66, 3-5, 267. |
| 【2】 Watanabe, H.; Hatakeyama, S.; Kawase, A. (Chugai Pharmaceutical Co. Ltd.); 24-Hydroxyvitamin D derivs.. EP 1061070; WO 9943645 . |
| 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) | 46307 | benzyl [(2R,3S)-3-[(benzyloxy)methyl]oxiranyl]methyl ether; (2R,3S)-2,3-bis[(benzyloxy)methyl]oxirane | C18H20O3 | 详情 | 详情 | |
| (XIV) | 14685 | 1,3-propanediol; Trimethylene Glycol | 504-63-2 | C3H8O2 | 详情 | 详情 |
| (XV) | 46308 | (2R,3S)-1,4-bis(benzyloxy)-3-(3-hydroxypropoxy)-2-butanol | C21H28O5 | 详情 | 详情 | |
| (XVI) | 13597 | 2,2-Dimethylpropanoyl chloride; Pivaloyl chloride | 3282-30-2 | C5H9ClO | 详情 | 详情 |
| (XVII) | 46309 | 3-([(1S,2R)-3-(benzyloxy)-1-[(benzyloxy)methyl]-2-hydroxypropyl]oxy)propyl pivalate | C26H36O6 | 详情 | 详情 | |
| (XVIII) | 46310 | 3-([(1S)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-hydroxyethyl]oxy)propyl pivalate | C15H28O6 | 详情 | 详情 | |
| (XIX) | 46311 | 3-([(1R)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-oxoethyl]oxy)propyl pivalate | C15H26O6 | 详情 | 详情 | |
| (XX) | 46312 | 3-([(1S)-1-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2-hydroxy-3-butenyl]oxy)propyl pivalate | C17H30O6 | 详情 | 详情 | |
| (XXI) | 46313 | 3-([(1R)-1-[(1R)-1,2-dihydroxyethyl]-2-[(2,2-dimethylpropanoyl)oxy]-3-butenyl]oxy)propyl pivalate | C19H34O7 | 详情 | 详情 | |
| (XXII) | 46314 | 3-([(1R)-2-[(2,2-dimethylpropanoyl)oxy]-1-[(2R)oxiranyl]-3-butenyl]oxy)propyl pivalate | C19H32O6 | 详情 | 详情 | |
| (XXIII) | 16299 | Lithium (trimethylsilyl)acetylide; [2-(Trimethylsilyl)ethynyl]lithium | 54655-07-1 | C5H9LiSi | 详情 | 详情 |
| (XXIV) | 46315 | (4R,5R)-4-(3-hydroxypropoxy)-1-octen-7-yne-3,5-diol | C11H18O4 | 详情 | 详情 | |
| (XXV) | 46316 | (5R,6R)-6-((1R)-1-[[tert-butyl(dimethyl)silyl]oxy]-3-butynyl)-2,2,3,3,12,12,13,13-octamethyl-5-vinyl-4,7,11-trioxa-3,12-disilatetradecane; tert-butyl(dimethyl)silyl 3-[[(1R,2R)-2-[[tert-butyl(dimethyl)silyl]oxy]-1-((1R)-1-[[tert-butyl(dimethyl)silyl]oxy]-2-propenyl)-4-pentynyl]oxy]propyl ether | C29H60O4Si3 | 详情 | 详情 |