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【结 构 式】

【分子编号】67550

【品名】sodium 2-methyl-2-(4-methylpyridin-2-yl)propanoate

【CA登记号】 

【 分 子 式 】C10H12NaNO2

【 分 子 量 】201.201

【元素组成】C 59.70% H 6.01% Na 11.43% N 6.96% O 15.90%

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:(XXIX)

Reaction of 2-acetyl-4-methylpyridine (XVI) with (trimethylsilyl)trifluoromethane (XVII) in the presence of NaOAc in DMSO produces the silylated tertiary alcohol (XVIII), which is further desilylated to alcohol (XIX) by treatment with k2CO3 in MeOH. Treatment of alcohol (XIX) with MsCl and NaH in THF, followed by substitution of the resultant mesylate (XX) with Me3Al in cyclohexane/hexane provides 4-methyl-2-(2,2,2-trifluoro-1,1-dimethylethyl)pyridine (XXI). Metalation of pyridine (XXI) with LDA (prepared from n-hexyllithium and didiisopropylamine in hexane) in THF, followed by condensation with Weinreb amide (XXII) at –15 °C, and subsequent quenching with H2SO4 in toluene leads to ketone (XXIII). Cyclization of crude ketone (XXIII) with thiourea (XXIV) in the presence of NBS in toluene/EtOH gives the hydrobromide salt 2-aminothiazole (XXV), which is finally converted to the free base intermediate (X) using pyridine in THF . Alternatively, intermediate (XXI) can be obtained by lithiation of 2,4-lutidine (XXVI) with BuLi in methyltetrahydrofuran at –30 °C, followed by condensation with diethyl carbonate (XXVII) in the same solvent, and subsequent dialkylation with MeI to produce the 2-pyridylisobutyrate (XXVIII). Finally, ethyl ester (XXVIII) is hydrolyzed with NaOH in EtOH at 78 °C, and the obtained sodium carboxylate (XXIX) subsequently fluorinated by using SF4 and HF .

1 Erb, B., Gallou, I.S., kleinbeck, F.k. (Novartis AG). Synthesis of 2-carboxamide cycloamino urea derivatives. US 2013331579; kR 2014009432; EP 2681192; JP 2014511387; CN 103402982; WO 2012117071.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(X) 67537 4-methyl-5-(2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridin-4-yl)thiazol-2-amine   C13H14F3N3S 详情 详情
(XVI) 67540 2-acetyl-4-methylpyridine;1-(4-Methylpyridin-2-yl)ethanone 59576-26-0 C8H9NO 详情 详情
(XVII) 67541 trimethyl(trifluoromethyl)silane   C4H9F3Si 详情 详情
(XVIII) 67542 4-methyl-2-(1,1,1-trifluoro-2-((trimethylsilyl)oxy)propan-2-yl)pyridine   C12H18F3NOSi 详情 详情
(XIX) 67543 1,1,1-trifluoro-2-(4-methylpyridin-2-yl)propan-2-ol   C9H10F3NO 详情 详情
(XX) 67544 1,1,1-trifluoro-2-(4-methylpyridin-2-yl)propan-2-yl methanesulfonate   C10H12F3NO3S 详情 详情
(XXI) 67545 4-methyl-2-(2,2,2-trifluoro-1,1-dimethylethyl)pyridine   C10H12F3N 详情 详情
(XXII) 17426 N-methoxy-N-methylacetamide 78191-00-1 C4H9NO2 详情 详情
(XXIII) 67546 1-(2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridin-4-yl)propan-2-one   C12H14F3NO 详情 详情
(XXIV) 10180 Thiourea 62-56-6 CH4N2S 详情 详情
(XXV) 67547 4-methyl-5-(2-(1,1,1-trifluoro-2-methylpropan-2-yl)pyridin-4-yl)thiazol-2-amine hydrobromide   C13H14F3N3S.HBr 详情 详情
(XXVI) 67548 2,4-lutidine 108-47-4 C7H9N 详情 详情
(XXVII) 17470 diethyl carbonate; diethylcarbonate 105-58-8 C5H10O3 详情 详情
(XXVIII) 67549 ethyl 2-methyl-2-(4-methylpyridin-2-yl)propanoate   C12H17NO2 详情 详情
(XXIX) 67550 sodium 2-methyl-2-(4-methylpyridin-2-yl)propanoate   C10H12NaNO2 详情 详情
Extended Information