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【结 构 式】 
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【分子编号】49404 【品名】N-[5-[(1R)-2-amino-1-hydroxyethyl]-2-hydroxyphenyl]methanesulfonamide 【CA登记号】 |
【 分 子 式 】C9H14N2O4S 【 分 子 量 】246.28724 【元素组成】C 43.89% H 5.73% N 11.37% O 25.98% S 13.02% |
合成路线1
该中间体在本合成路线中的序号：(VI)The condensation of benzaldehyde (I) with thiazolidine-2,4-dione (II) by means of piperidine in ethanol gives the benzylidene-thiazolidinedione (III), which is reduced with H2 over Pd/C in methanol to yield the benzyl derivative (IV). The cleavage of the cyclic ketal group of (IV) with HCl affords the piperidone (V), which is finally reductocondensed with the chiral ethanolamine (VI) by means of sodium triacetoxyborohydride in DMF to provide the target compound. The intermediate ethanolamine (VI) has been obtained as follows: The reaction of 3-amino-4-(benzyloxy)acetophenone (VII) with Ms-Cl and pyridine in dichloromethane gives the expected sulfonamide (VIII), which is brominated with CuBr2 in chloroform to yield the phenacyl bromide (IX). Enantioselective reduction with the Corey's chiral oxazaborolidine catalyst affords the (R)-bromoethanol derivative (X), which is treated with NaN3 in DMSO to provide the azido compound (XI). Finally, this compound is reduced and debenzylated by hydrogenation with H2 over Pd/C in methanol to furnish the desired ethanolamine intermediate (VI).
| 【1】 Gunawan, I.; Ellingboe, J.; Hu, B.; et al.; 2,4-Thiazolidinediones as potent and selective human beta3 agonists. Bioorg Med Chem Lett 2001, 11, 6, 757. |
| 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) | 49400 | 4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)benzaldehyde | C14H17NO3 | 详情 | 详情 | |
| (II) | 10883 | 1,3-Thiazolane-2,4-dione; 2,4-Thiazolidinedione | 2295-31-0 | C3H3NO2S | 详情 | 详情 |
| (III) | 49401 | 5-[(E)-[4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)phenyl]methylidene]-1,3-thiazolidine-2,4-dione | C17H18N2O4S | 详情 | 详情 | |
| (IV) | 49402 | 5-[4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)benzyl]-1,3-thiazolidine-2,4-dione | C17H20N2O4S | 详情 | 详情 | |
| (V) | 49403 | 5-[4-(4-oxo-1-piperidinyl)benzyl]-1,3-thiazolidine-2,4-dione | C15H16N2O3S | 详情 | 详情 | |
| (VI) | 49404 | N-[5-[(1R)-2-amino-1-hydroxyethyl]-2-hydroxyphenyl]methanesulfonamide | C9H14N2O4S | 详情 | 详情 | |
| (VII) | 20628 | 1-[3-amino-4-(benzyloxy)phenyl]-1-ethanone | C15H15NO2 | 详情 | 详情 | |
| (VIII) | 20629 | N-[5-acetyl-2-(benzyloxy)phenyl]methanesulfonamide | C16H17NO4S | 详情 | 详情 | |
| (IX) | 20630 | N-[2-(benzyloxy)-5-(2-bromoacetyl)phenyl]methanesulfonamide | C16H16BrNO4S | 详情 | 详情 | |
| (X) | 20634 | N-[2-(benzyloxy)-5-[(1R)-2-bromo-1-hydroxyethyl]phenyl]methanesulfonamide | C16H18BrNO4S | 详情 | 详情 | |
| (XI) | 49405 | N-[5-[(1R)-2-azido-1-hydroxyethyl]-2-(benzyloxy)phenyl]methanesulfonamide | C16H18N4O4S | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(VIII)Condensation of ethyl 4-fluorobenzoate (I) with 4-piperidone ethylene ketal (II) afforded the N-arylpiperidine (III). Saponification of the ethyl ester group of (III), followed by acidic hydrolysis of the ethylene ketal function, yielded the benzoic acid derivative (V). Coupling of acid (V) with leucine ethyl ester (VI) using EDC gave amide (VII). Then, reductive amination of piperidone (VII) with the known arylethanolamine (VIII) using NaBH(OAc)3 furnished the aminopiperidine (IX). The ethyl ester group of (IX) was finally hydrolyzed with NaOH to provide the corresponding carboxylic acid.
| 【1】 Hu, B.; et al.; (4-Piperidin-1-yl)phenyl amides: Potent and selective human beta3 agonists. J Med Chem 2001, 44, 9, 1456. |
| 【2】 Taylor, E.C.; Skotnicki, J.S.; A convenient synthesis of 1-aryl-4-piperidones. Synthesis 1981, 606. |
| 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) | 22830 | ethyl 4-fluorobenzoate | 451-46-7 | C9H9FO2 | 详情 | 详情 |
| (II) | 11338 | 1,4-Dioxa-8-azaspiro[4.5]decane; 4-Piperidone ethylene ketal | 177-11-7 | C7H13NO2 | 详情 | 详情 |
| (III) | 50886 | ethyl 4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)benzoate | C16H21NO4 | 详情 | 详情 | |
| (IV) | 50887 | 4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)benzoic acid | C14H17NO4 | 详情 | 详情 | |
| (V) | 50888 | 4-(4-oxo-1-piperidinyl)benzoic acid | C12H13NO3 | 详情 | 详情 | |
| (VI) | 50889 | ethyl (2S)-2-amino-4-methylpentanoate | C8H17NO2 | 详情 | 详情 | |
| (VII) | 50890 | ethyl (2S)-4-methyl-2-[[4-(4-oxo-1-piperidinyl)benzoyl]amino]pentanoate | C20H28N2O4 | 详情 | 详情 | |
| (VIII) | 49404 | N-[5-[(1R)-2-amino-1-hydroxyethyl]-2-hydroxyphenyl]methanesulfonamide | C9H14N2O4S | 详情 | 详情 | |
| (IX) | 50891 | ethyl (2S)-2-[(4-[4-[((2R)-2-hydroxy-2-[4-hydroxy-3-[(methylsulfonyl)amino]phenyl]ethyl)amino]-1-piperidinyl]benzoyl)amino]-4-methylpentanoate | C29H42N4O7S | 详情 | 详情 |