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【结 构 式】 
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【分子编号】13099 【品名】(3R)-2-(2,4-Difluorophenyl)-3-methyloxirane 【CA登记号】 |
【 分 子 式 】C9H8F2O 【 分 子 量 】170.1587264 【元素组成】C 63.53% H 4.74% F 22.33% O 9.4% |
合成路线1
该中间体在本合成路线中的序号：(V)A synthesis of Sch-42427, the active (RR)-enantiomer of Sch-39304, has been published: The condensation of 1,3-difluorobenzene (I) with (S)-2-chloropropionyl chloride (II) by means of AlCl3 gives 2(S)-chloro-1-(2,4-difluorophenyl)-1-propanone (III), which is reduced with NaCNBH3 to the corresponding alcohol (IV). Epoxidation of (IV) with K2CO3 in methanol yields the chiral epoxide (V). The oxidative opening of (V) by means of BF3 in DMSO affords (R)-1-(2,4-difluorophenyl)-2-hydroxypropanone (VI), which is protected with dihydropyran (DHP) and p-toluenesulfonic acid to the tetrahydropyranyl ether (VIII). Alternatively, the treatment of (V) with trimethylsilyl bromide and dihydropyran gives the (R)-bromo-tetrahydropyranyl ether (VII), which can be oxidized to (VIII) with silver benzoate. The reaction of (VIII) with sodium dimethylsulfoxonium methylide in THF gives the epoxide (IX), which is opened with sodium 1,2,4-triazole (X) to yield the semi-protected diol (XI). Hydrolysis of (XI) in acidic medium affords the diol (XII), which is treated with methanesulfonyl chloride and triethylamine to afford the mono methanesulfonyl ester (XIII). The reaction of (XIII) with sodium methyl mercaptane gives the thioether (XIV), which is finally oxidized with peracetic acid.
| 【1】 Girijavallabhan, V.M.; Pinto, P.A.; Ganguly, A.K.; Sarre, O.Z.; Synthesis of the antifungal agent SCH 42427 (SM 9164). Bioorg Med Chem Lett 1992, 1, 7, 349. |
| 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) | 13095 | m-Difluorobenzene; 1,3-Difluorobenzene | 372-18-9 | C6H4F2 | 详情 | 详情 |
| (II) | 13096 | (2S)-2-Chloropropanoyl chloride | C3H4Cl2O | 详情 | 详情 | |
| (III) | 13097 | (2S)-2-Chloro-1-(2,4-difluorophenyl)-1-propanone | C9H7ClF2O | 详情 | 详情 | |
| (IV) | 13098 | (2S)-2-Chloro-1-(2,4-difluorophenyl)-1-propanol | C9H9ClF2O | 详情 | 详情 | |
| (V) | 13099 | (3R)-2-(2,4-Difluorophenyl)-3-methyloxirane | C9H8F2O | 详情 | 详情 | |
| (VI) | 13100 | (2R)-1-(2,4-Difluorophenyl)-2-hydroxy-1-propanone | C9H8F2O2 | 详情 | 详情 | |
| (VII) | 13101 | 2-[[(1R)-2-Bromo-2-(2,4-difluorophenyl)-1-methylethyl]oxy]tetrahydro-2H-pyran; (1R)-2-Bromo-2-(2,4-difluorophenyl)-1-methylethyl tetrahydro-2H-pyran-2-yl ether | C14H17BrF2O2 | 详情 | 详情 | |
| (VIII) | 13102 | (2R)-1-(2,4-Difluorophenyl)-2-(tetrahydro-2H-pyran-2-yloxy)-1-propanone | C14H16F2O3 | 详情 | 详情 | |
| (IX) | 13103 | (1R)-1-[(2R)-2-(2,4-Difluorophenyl)oxiranyl]ethyl tetrahydro-2H-pyran-2-yl ether; 2-([(1R)-1-[(2R)-2-(2,4-Difluorophenyl)oxiranyl]ethyl]oxy)tetrahydro-2H-pyran | C15H18F2O3 | 详情 | 详情 | |
| (X) | 13104 | 1,2,4-Triazole, sodium derivative | 41253-21-8 | C2H2N3Na | 详情 | 详情 |
| (XI) | 13105 | (2R,3R)-2-(2,4-Difluorophenyl)-3-(tetrahydro-2H-pyran-2-yloxy)-1-(1H-1,2,4-triazol-1-yl)-2-butanol | C17H21F2N3O3 | 详情 | 详情 | |
| (XII) | 13106 | (2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol | C12H13F2N3O2 | 详情 | 详情 | |
| (XIII) | 13107 | (1R,2R)-2-(2,4-difluorophenyl)-2-hydroxy-1-methyl-3-(1H-1,2,4-triazol-1-yl)propyl methanesulfonate | C13H15F2N3O4S | 详情 | 详情 | |
| (XIV) | 13108 | (2R,3R)-2-(2,4-Difluorophenyl)-3-(methylsulfanyl)-1-(1H-1,2,4-triazol-1-yl)-2-butanol | C13H15F2N3OS | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(I)A synthesis of Sch-42427/SM-9164, the active (RR)-enantiomer of Sch-39304, has been reported: The reaction of the chiral epoxide 2-(2,4-difluorophenyl)-3(R)-methyloxirane (I) with trimethylsilyltriflate (TMSOTf) or tert-butyldimethylsilyl triflate (TBDMSOTf) yields compound (II) or (III), respectively; the acidic hydrolysis of both compounds affords the chiral ketol (IV), which is protected with dihydropyran (DHP) to give the tetrahydropyranyl ether (V). The regioselective reaction of (V) with trimethylsulfonium iodide and NaH in THF affords the chiral oxirane (VI), which is treated with sodium 1,2,4-triazole (VII) in DMF to afford the (R,R)-diol (VIII). Finally, this compound is partially esterified with methanesulfonyl chloride, treated with methylmercaptane, and finally oxidized with peracetic acid.
| 【1】 Gala, D.; DiBenedetto, D.J.; A rational approach to chiral alpha-hydroxy aryl ketones from chiral aryl epoxides via regioselective, stereo retentive oxidative epoxide opening: Its application to the synthesis of antifungal Sch 42427/SM 9164. Tetrahedron Lett 1994, 35, 45, 8299. |
| 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) | 13099 | (3R)-2-(2,4-Difluorophenyl)-3-methyloxirane | C9H8F2O | 详情 | 详情 | |
| (II) | 13119 | (2R)-1-(2,4-Difluorophenyl)-2-[(trimethylsilyl)oxy]-1-propanone | C12H16F2O2Si | 详情 | 详情 | |
| (III) | 13120 | (2R)-2-[[tert-Butyl(dimethyl)silyl]oxy]-1-(2,4-difluorophenyl)-1-propanone | C15H22F2O2Si | 详情 | 详情 | |
| (IV) | 13100 | (2R)-1-(2,4-Difluorophenyl)-2-hydroxy-1-propanone | C9H8F2O2 | 详情 | 详情 | |
| (V) | 13102 | (2R)-1-(2,4-Difluorophenyl)-2-(tetrahydro-2H-pyran-2-yloxy)-1-propanone | C14H16F2O3 | 详情 | 详情 | |
| (VI) | 13123 | (2R)-2-(2,4-Difluorophenyl)-2-[(1R)-1-phenoxyethyl]oxirane; (1R)-1-[(2R)-2-(2,4-Difluorophenyl)oxiranyl]ethyl phenyl ether | C16H14F2O2 | 详情 | 详情 | |
| (VII) | 13104 | 1,2,4-Triazole, sodium derivative | 41253-21-8 | C2H2N3Na | 详情 | 详情 |
| (VIII) | 13106 | (2R,3R)-2-(2,4-Difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)-2,3-butanediol | C12H13F2N3O2 | 详情 | 详情 |