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【结 构 式】

【分子编号】49290

【品名】1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-1-ethanone

【CA登记号】

【 分 子 式 】C12H14N2O2S

【 分 子 量 】250.32144

【元素组成】C 57.58% H 5.64% N 11.19% O 12.78% S 12.81%
与该中间体有关的原料药合成路线共 2 条
合成路线1合成路线2

合成路线1

该中间体在本合成路线中的序号：(VI)

The cyclization of phosphonate (I) with the chiral alcohol (II) by means of tert-butyl hypochlorite and Et-MgBr gives the isoxazoline (III), which is condensed with 2-methylthiazole-4-carbaldehyde (IV) by means of DBU and LiCl in acetonitrile to yield the secondary alcohol (V). The oxidation of (V) with TPAP and NMO in dichloromethane affords the corresponding ketone (VI), which is treated with the Grignard reagent (VII) in THF to provide the expected secondary alcohol (VIII). The silylation of (VIII) with Tes-OTf in dichloromethane gives the silyl ether (IX), which is treated with SmI2, Et3B and NaBH4 to cleave the isoxazoline ring and yield the diol (X). The reaction of (X) with SOCl2, TEA and TBAF affords the chiral epoxide (XI), which is silylated with Tes-Cl and TEA to provide the silyl ether (XII). The selective hydrolysis of the primary silyl ether of (XII) with HOAc in THF/water gives the primary alcohol (XIII), which is oxidized with TPAP and NMO in dichloromethane to yield the corresponding aldehyde (XIV). The condensation of (XIV) with ketone (XV) by means of LDA affords the open-chain precursor (XVI).

参考文献 中间体
合成目标
【1】 Bode, J.W.; Carreira, E.M.; Stereoselective syntheses of epothilones A and B via directed nitrile oxide cycloaddition. J Am Chem Soc 2001, 123, 18, 3611.
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) 49286 diethyl 2-(hydroxyimino)-1-methylethylphosphonate C7H16NO4P 详情 详情
(II) 49287 (2R)-3-buten-2-ol 33447-72-2 C4H8O 详情 详情
(III) 49288 diethyl 1-[(5R)-5-[(1R)-1-hydroxyethyl]-4,5-dihydro-3-isoxazolyl]ethylphosphonate C11H22NO5P 详情 详情
(IV) 44455 2-methyl-1,3-thiazole-4-carbaldehyde C5H5NOS 详情 详情
(V) 49289 (1R)-1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-1-ethanol C12H16N2O2S 详情 详情
(VI) 49290 1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-1-ethanone C12H14N2O2S 详情 详情
(VII) 49291 bromo[(4S)-4-methyl-5-[(triisopropylsilyl)oxy]pentyl]magnesium C15H33BrMgOSi 详情 详情
(VIII) 49292 (2R,6S)-6-methyl-2-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-7-[(triisopropylsilyl)oxy]-2-heptanol C27H48N2O3SSi 详情 详情
(IX) 49293 (5R)-5-[(1R,5S)-1,5-dimethyl-1-[(triethylsilyl)oxy]-6-[(triisopropylsilyl)oxy]hexyl]-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydroisoxazole; (1R,5S)-1,5-dimethyl-1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-6-[(triisopropylsilyl)oxy]hexyl triethylsilyl ether C33H62N2O3SSi2 详情 详情
(X) 49294 (E,3S,5R,6R,10S)-2,6,10-trimethyl-1-(2-methyl-1,3-thiazol-4-yl)-6-[(triethylsilyl)oxy]-11-[(triisopropylsilyl)oxy]-1-undecene-3,5-diol C33H65NO4SSi2 详情 详情
(XI) 49295 (2S,3E)-3-methyl-1-((2S,3R)-3-methyl-3-[(4S)-4-methyl-5-[(triisopropylsilyl)oxy]pentyl]oxiranyl)-4-(2-methyl-1,3-thiazol-4-yl)-3-buten-2-ol C27H49NO3SSi 详情 详情
(XII) 49296 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)pentyl triisopropylsilyl ether; 2-methyl-4-[(E,3S)-2-methyl-4-((2S,3R)-3-methyl-3-[(4S)-4-methyl-5-[(triisopropylsilyl)oxy]pentyl]oxiranyl)-3-[(triethylsilyl)oxy]-1-butenyl]-1,3-thiazole C33H63NO3SSi2 详情 详情
(XIII) 49297 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)-1-pentanol C24H43NO3SSi 详情 详情
(XIV) 49278 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)pentanal C24H41NO3SSi 详情 详情
(XV) 44451 (5S)-5-[[tert-butyl(dimethyl)silyl]oxy]-4,4-dimethyl-7-octen-3-one C16H32O2Si 详情 详情
(XVI) 49298 (4S,7R,8S,9S)-4-[[tert-butyl(dimethyl)silyl]oxy]-8-hydroxy-5,5,7,9-tetramethyl-12-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)-1-dodecen-6-one C40H73NO5SSi2 详情 详情

合成路线2

该中间体在本合成路线中的序号：(VI)

The reaction of the oxime (I) with the 1-methylallyl alcohol (II) by means of Et-MgBr gives the isoxazoline (III), which is condensed with 2-methylthiazole-4-carbaldehyde (IV) by means of DBU and LiCl in acetonitrile to yield the adduct (V). The oxidation of (V) with TPAP and NMO affords the methyl ketone (VI), which is condensed with the Grignard reagent (VII) in THF to provide the tertiary alcohol (VIII). The protection of (VIII) by means of Tes-OTf gives the silylated compound (IX), which is oxidated with SmI2 in THF to yield the beta-hydroxy ketone (X). The reduction of (X) with Et3B and NaBH4 in THF/methanol affords the beta-diol (XI), which is treated with SOCl2, TEA and TBAF to provide the epoxide derivative (XII). The silylation of both OH groups of (XII) by means of Tes-Cl and TEA in dichloromethane furnishes the bis-silyl ether (XIII), which is selectively monodesilylated by means of AcOH in THF/water to give the primary alcohol (XIV). The oxidation of this alcohol by means of TPAP and NMO yields the carbaldehyde (XV).

参考文献 中间体
合成目标
【1】 Bode, J.W.; Carreira, E.M.; Stereoselective syntheses of epothilones A and B via nitrile oxide cycloadditions and related studies. J Org Chem 2001, 66, 19, 6410.
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) 60651 dipropyl (1S)-2-chloro-2-(hydroxyimino)-1-methylethylphosphonate C9H19ClNO4P 详情 详情
(II) 49287 (2R)-3-buten-2-ol 33447-72-2 C4H8O 详情 详情
(III) 60652 diethyl (1S)-1-{(5R)-5-[(1R)-1-hydroxyethyl]-4,5-dihydro-3-isoxazolyl}ethylphosphonate C11H22NO5P 详情 详情
(IV) 44455 2-methyl-1,3-thiazole-4-carbaldehyde C5H5NOS 详情 详情
(V) 49289 (1R)-1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-1-ethanol C12H16N2O2S 详情 详情
(VI) 49290 1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-1-ethanone C12H14N2O2S 详情 详情
(VII) 49291 bromo[(4S)-4-methyl-5-[(triisopropylsilyl)oxy]pentyl]magnesium C15H33BrMgOSi 详情 详情
(VIII) 49292 (2R,6S)-6-methyl-2-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-7-[(triisopropylsilyl)oxy]-2-heptanol C27H48N2O3SSi 详情 详情
(IX) 49293 (5R)-5-[(1R,5S)-1,5-dimethyl-1-[(triethylsilyl)oxy]-6-[(triisopropylsilyl)oxy]hexyl]-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydroisoxazole; (1R,5S)-1,5-dimethyl-1-[(5R)-3-[(E)-1-methyl-2-(2-methyl-1,3-thiazol-4-yl)ethenyl]-4,5-dihydro-5-isoxazolyl]-6-[(triisopropylsilyl)oxy]hexyl triethylsilyl ether C33H62N2O3SSi2 详情 详情
(X) 60653 (E,5R,6R,10S)-5-hydroxy-2,6,10-trimethyl-1-(2-methyl-1,3-thiazol-4-yl)-6-[(triethylsilyl)oxy]-11-[(triisopropylsilyl)oxy]-1-undecen-3-one C33H63NO4SSi2 详情 详情
(XI) 49294 (E,3S,5R,6R,10S)-2,6,10-trimethyl-1-(2-methyl-1,3-thiazol-4-yl)-6-[(triethylsilyl)oxy]-11-[(triisopropylsilyl)oxy]-1-undecene-3,5-diol C33H65NO4SSi2 详情 详情
(XII) 60654 (2S,3E)-1-{(2S,3R)-3-[(4S)-5-hydroxy-4-methylpentyl]-3-methyloxiranyl}-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-3-buten-2-ol C18H29NO3S 详情 详情
(XIII) 60655 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-{(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl}oxiranyl)pentyl triethylsilyl ether; 2-methyl-4-{(E,3S)-2-methyl-4-((2S,3R)-3-methyl-3-{(4S)-4-methyl-5-[(triethylsilyl)oxy]pentyl}oxiranyl)-3-[(triethylsilyl)oxy]-1-butenyl}-1,3-thiazole C30H57NO3SSi2 详情 详情
(XIV) 49297 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)-1-pentanol C24H43NO3SSi 详情 详情
(XV) 49278 (2S)-2-methyl-5-((2R,3S)-2-methyl-3-[(2S,3E)-3-methyl-4-(2-methyl-1,3-thiazol-4-yl)-2-[(triethylsilyl)oxy]-3-butenyl]oxiranyl)pentanal C24H41NO3SSi 详情 详情
Extended Information