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【结 构 式】

【分子编号】68584

【品名】diethyl 3-(benzyloxy)-4-oxo-1,4-dihydropyridine-2,5-dicarboxylate

【CA登记号】 

【 分 子 式 】C18H19NO6

【 分 子 量 】345.352

【元素组成】C 62.6% H 5.55% N 4.06% O 27.8%

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:(XXII)

Condensation of ethyl 3-(dimethylamino)acrylate (XVIII) with (benzyloxy)acetyl chloride (XIX) by means of pyridine in CH2Cl2 gives ethyl 2-[(benzyloxy)acetyl]-3-(dimethylamino)-2-propenoate (XX), which by cyclocondensation with ethyl oxalyl chloride (XXI) in the presence of LiHMDS in THF at –78 °C followed by heating with NH4OAc and AcOH affords pyridone derivative (XXII). Alkylation of pyridone (XXII) with bromoacetaldehyde dimethyl acetal (XXIII) and Cs2CO3 in DMF yields diethyl 1-(2,2-dimethoxyethyl)-3-(benzyloxy)-1,4-dihydropyridine-2,5-dicarboxylate (XXIV), which can also be obtained by condensation of diethyl 3-(benzyloxy)-4-oxo-4H-pyran-2,5-dicarboxylate (XXV) with 2,2-dimethoxyethylamine (XXVI) in EtOH. Hydrolysis of acetal (XXIV) with H2SO4 and HCOOH in CH2Cl2 yields aldehyde (XXVII), which upon cyclocondensation with 3(R)-amino-1-butanol (XI) by means of AcOH in refluxing MeOH/toluene provides the hexahydropyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine derivative (XXVIII). Hydrolysis of ester (XXVIII) with NaOH in THF/MeOH/H2O gives the corresponding free acid (XXIX), which is finally condensed with 2,4-difluorobenzylamine (XIV) in the presence of HATU and NMM in DMF .
Propenoate (XX) can also be prepared by condensation of ethyl 4-chloroacetoacetate (XXX) with PhCH2OH in the presence of t-AmONa to give benzyl ether (XXXI), which then reacts with N,N-dimethylformamide dimethyl acetal (XXXII) in toluene .

1 Sumino, Y., Okamoto, K., Masui, M., Yamada, D., Ikarashi, F. (Shionogi & Co., Ltd.). Process for preparing compound having HIV integrase inhibitory activity. WO 2012018065.
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
(XVIII) 16000 ethyl (E)-3-(dimethylamino)-2-propenoate; Ethyl trans-3-dimethylaminoacrylate 1117-37-9 C7H13NO2 详情 详情
(XIX) 10493 2-(Benzyloxy)acetyl chloride; Benzyloxyacetyl chloride 19810-31-2 C9H9ClO2 详情 详情
(XX) 68583 (E)-ethyl 4-(benzyloxy)-2-((dimethylamino)methylene)-3-oxobutanoate   C16H21NO4 详情 详情
(XXI) 11043 Ethyl 2-chloro-2-oxoacetate; Ethyl oxalyl chloride 4755-77-5 C4H5ClO3 详情 详情
(XXII) 68584 diethyl 3-(benzyloxy)-4-oxo-1,4-dihydropyridine-2,5-dicarboxylate   C18H19NO6 详情 详情
(XXIII) 13183 2-Bromo-1,1-dimethoxyethane; 2-Bromo-1-methoxyethyl methyl ether; Bromoacetaldehyde dimethyl acetal 7252-83-7 C4H9BrO2 详情 详情
(XXIV) 68585 1-(2,2-dimethoxyethyl)-3-(benzyloxy)-1,4-dihydropyridine-2,5-dicarboxylate diethyl;diethyl 3-(benzyloxy)-1-(2,2-dimethoxyethyl)-4-oxo-1,4-dihydropyridine-2,5-dicarboxylate   C22H27NO8 详情 详情
(XXV) 68586 diethyl 3-(benzyloxy)-4-oxo-4H-pyran-2,5-dicarboxylate   C18H18O7 详情 详情
(XXVI) 34158 aminoacetaldehyde dimethylacetal; 2,2-dimethoxy-1-ethanamine; 2,2-dimethoxyethylamine 22483-09-6 C4H11NO2 详情 详情
(XXVII) 68587 diethyl 3-(benzyloxy)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2,5-dicarboxylate   C20H21NO7 详情 详情
(XXVIII) 68588 (4R,12aS)-ethyl 7-(benzyloxy)-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-carboxylate   C22H24N2O6 详情 详情
(XXIX) 68589 (4R,12aS)-7-(benzyloxy)-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   C20H20N2O6 详情 详情
(XXX) 23541 ethyl 4-chloro-3-oxobutanoate;Ethyl 4-chloro-3-oxobutanoate;Ethyl 4-chloroacetoacetate 638-07-3 C6H9ClO3 详情 详情
(XXXI) 68590 ethyl 4-(benzyloxy)-3-oxobutanoate   C13H16O4 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
Extended Information