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【结 构 式】 
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【分子编号】68601 【品名】(Z)-methyl 2-(((2,2-dimethoxyethyl)amino)methylene)-4-methoxy-3-oxobutanoate 【CA登记号】 |
【 分 子 式 】C11H19NO6 【 分 子 量 】261.275 【元素组成】C 50.57% H 7.33% N 5.36% O 36.74% |
合成路线1
该中间体在本合成路线中的序号：(XLV)Condensation of methyl 4-methoxyacetoacetate (XLIII) with N,N-dimethylformamide dimethyl acetal (XXXII) produces methyl 3-(dimethylamino)-2-(methoxyacetyl)-2-propenoate (XLIV), which by reaction with 2,2-dimethoxyethylamine (XXVI) in MeOH affords the N-(dimethyoxyethyl)enamine (XLV). Cyclization of enaminoketone (XLV) with dimethyl oxalate (XXXVI) by means of LiH at 40 °C gives the dimethyl pyridone-dicarboxylate (XLVI), which by selective hydrolysis with LiOH yields the monocarboxylic acid (XLVII). Hydrolysis of acetal (XLVII) with MsOH and AcOH in acetonitrile at 58-65 °C followed by in situ cyclization of the resulting aldehyde (XLVIII) with 3(R)-amino-1-butanol (XI) in acetonitrile at 64 °C affords the pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine derivative (XLIX). Activation of acid (XLIX) with CDI in DME at 80 °C and subsequent coupling with 2,4-difluorobenzylamine (XIV) gives amide (L), which is finally O-demethylated with either MgBr2 in hot acetonitrile or LiBr in refluxing THF .
| 【1】 Wang, H., Goodman, S.N., Mans, D., Kowalski, M. (GlaxoSmithKline, Inc.). Process for preparing carbamoylpyridone derivatives and intermediates. WO 2011119566. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XI) | 68577 | 3(R)-amino-1-butanol;(R)-3-aminobutan-1-ol | 61477-39-2 | C4H11NO | 详情 | 详情 |
| (XIV) | 68578 | 2,4-difluorobenzylamine | 72235-52-0 | C7H7F2N | 详情 | 详情 |
| (XV) | 68579 | (4R,12aS)-7-(benzyloxy)-N-(2,4-difluorobenzyl)-4-methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxamide | C27H25F2N3O5 | 详情 | 详情 | |
| (XXVI) | 34158 | aminoacetaldehyde dimethylacetal; 2,2-dimethoxy-1-ethanamine; 2,2-dimethoxyethylamine | 22483-09-6 | C4H11NO2 | 详情 | 详情 |
| (XXXII) | 11984 | N-(Dimethoxymethyl)-N,N-dimethylamine;dimethylformamide dimethylacetal;1,1-dimethoxy-N,N-dimethylmethanamine； Dimethoxy-N,N-dimethylmethanamine; N,N-Dimethylformamide dimethyl acetal | 4637-24-5 | C5H13NO2 | 详情 | 详情 |
| (XXXVI) | 37412 | methyl 2-methoxy-2-oxoacetate;dimethyl oxalate;Methyl oxalate | 553-90-2 | C4H6O4 | 详情 | 详情 |
| (XLIII) | 26655 | methyl 4-methoxy-3-oxobutanoate;Methyl 4-methoxyacetoacetate;Methyl 4-methoxy-3-oxo-butanoate | 41051-15-4 | C6H10O4 | 详情 | 详情 |
| (XLIV) | 68600 | methyl 3-(dimethylamino)-2-(methoxyacetyl)-2-propenoate;(Z)-methyl 2-((dimethylamino)methylene)-4-methoxy-3-oxobutanoate | C9H15NO4 | 详情 | 详情 | |
| (XLV) | 68601 | (Z)-methyl 2-(((2,2-dimethoxyethyl)amino)methylene)-4-methoxy-3-oxobutanoate | C11H19NO6 | 详情 | 详情 | |
| (XLVI) | 68602 | dimethyl 1-(2,2-dimethoxyethyl)-3-methoxy-4-oxo-1,4-dihydropyridine-2,5-dicarboxylate | C14H19NO8 | 详情 | 详情 | |
| (XLVII) | 68603 | 1-(2,2-dimethoxyethyl)-5-methoxy-6-(methoxycarbonyl)-4-oxo-1,4-dihydropyridine-3-carboxylic acid | C13H17NO8 | 详情 | 详情 | |
| (XLVIII) | 68604 | 5-methoxy-6-(methoxycarbonyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-3-carboxylic acid | C11H11NO7 | 详情 | 详情 | |
| (XLIX) | 68606 | (4R,12aS)-7-methoxy-4-methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxylic acid | C14H16N2O6 | 详情 | 详情 | |
| (L) | 68605 | (4R,12aS)-N-(2,4-difluorobenzyl)-7-methoxy-4-methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2H-pyrido[1',2':4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxamide | C21H21F2N3O5 | 详情 | 详情 |