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【结 构 式】

【分子编号】42979

【品名】2-[2-(trityloxy)ethoxy]acetic acid

【CA登记号】

【 分 子 式 】C23H22O4

【 分 子 量 】362.42528

【元素组成】C 76.22% H 6.12% O 17.66%

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:(III)

Treatment of 2-(trityloxy)ethanol (I) with bromoacetic acid (II) and n-BuLi in THF affords ethoxyacetic acid derivative (III), which is then converted into ethyl ester (IV) by means of EtOH and DCC in CH2Cl2 in the presence of 4-pyrrolidinopyridine. Reaction of (IV) with Grignard reagent, prepared from 2-bromo-3-methylthiophene (V) and Mg turnings in THF, provides compound (VI), which is then converted into the corresponding tosylate derivative (VII) by treatment with BuLi and p-toluenesulfonyl chloride (p-TsCl) in toluene. Reaction of (VII) with (R)-ethyl nipecotate (VIII) and K2CO3 yields ethyl ester (IX), which is finally hydrolyzed with aqueous NaOH in EtOH followed by treatment with diluted HCl.

1 Knutsen, L.J.S.; Andersen, K.E.; Lau, J.; et al.; Synthesis of novel GABA uptake inhibitors. 3. Diaryloximine and diarylvinyl ether derivatives of nipecotic acid and guvacine as anticonvulsant agents. J Med Chem 1999, 42, 18, 3447.
2 Knutsen, L.J.S.; Jorgensen, A.S.; Andersen, K.E.; Sonnewald, U. (Novo Nordisk A/S); Novel N-substd. azaheterocyclic carboxylic acids. EP 0374801; JP 1990223551; US 5071859; US 5214057 .
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) 42978 2-(trityloxy)-1-ethanol C21H20O2 详情 详情
(II) 23660 2-Bromoacetic acid 79-08-3 C2H3BrO2 详情 详情
(III) 42979 2-[2-(trityloxy)ethoxy]acetic acid C23H22O4 详情 详情
(IV) 42980 ethyl 2-[2-(trityloxy)ethoxy]acetate C25H26O4 详情 详情
(V) 12443 2-Bromo-3-methylthiophene 14282-76-9 C5H5BrS 详情 详情
(VI) 42981 2-[[2,2-bis(3-methyl-2-thienyl)vinyl]oxy]-1-ethanol C14H16O2S2 详情 详情
(VII) 42982 2-[[2,2-bis(3-methyl-2-thienyl)vinyl]oxy]ethyl 4-methylbenzenesulfonate C21H22O4S3 详情 详情
(VIII) 12453 ethyl (3R)hexahydro-3-pyridinecarboxylate C8H15NO2 详情 详情
(IX) 42983 ethyl (3R)-1-(2-[[2,2-bis(3-methyl-2-thienyl)vinyl]oxy]ethyl)-3-piperidinecarboxylate C22H29NO3S2 详情 详情
Extended Information