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【结 构 式】 
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【分子编号】26549 【品名】2-chloro-1-(3-pyridinyl)-1-ethanone 【CA登记号】 |
【 分 子 式 】C7H6ClNO 【 分 子 量 】155.58348 【元素组成】C 54.04% H 3.89% Cl 22.79% N 9% O 10.28% |
合成路线1
该中间体在本合成路线中的序号：(VI)Chlorination of 3-acetylpyridine (V) with N-chlorosuccinimide in HCl-AcOH gave (chloroacetyl)pyridine (VI). Subsequent enantioselective reduction of (VI) using (-)-B-chlorodiisopinocampheylborane yielded (R)-chlorohydrin (VII), which was cyclized to pyridyloxirane (VIII) with K2CO3 in boiling acetone. Opening of epoxide (VIII) with 4-aminophenethylamine (IX) produced amino alcohol (X). After protection as the tert-butyl carbamate (XI), coupling with sulfonyl chloride (IV) furnished sulfonamide (XII). Finally, Boc deprotection of (XII) using TFA produced the title compound.
| 【1】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (IV) | 26548 | 4-[[(hexylamino)carbonyl]amino]benzenesulfonyl chloride | C13H19ClN2O3S | 详情 | 详情 | |
| (V) | 12027 | 1-(3-Pyridinyl)-1-ethanone; 1-(3-Pyridinyl)ethanone | 350-03-8 | C7H7NO | 详情 | 详情 |
| (VI) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (VII) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (VIII) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (IX) | 18961 | 4-(2-aminoethyl)aniline; 4-(2-aminoethyl)phenylamine | 13472-00-9 | C8H12N2 | 详情 | 详情 |
| (X) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (XI) | 26553 | tert-butyl 4-aminophenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C20H27N3O3 | 详情 | 详情 | |
| (XII) | 26554 | tert-butyl 4-[[(4-[[(hexylamino)carbonyl]amino]phenyl)sulfonyl]amino]phenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C33H45N5O6S | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(II)The chlorination of 3-acetylpyridine (I) with N-chlorosuccinimide (NCS) in acetic acid gives 3-(2-chloroacetyl)pyridine (II), which is reduced with (-)-B-chlorodiisopinocampheylborane [(-)-DIP-Cl] yielding the chiral chloroethanol (III). The epoxidation of (III) with K2CO3 in refluxing acetone affords the chiral epoxide (IV), which is opened with 4-(2-aminoethyl)aniline (V) in refluxing methanol giving the chiral aminoethanol (VI). The protection of the aliphatic amino group of (VI) with di-tert-butyl dicarbonate yields the carbamate (VII), which is finally condensed with the sulfonyl chloride (VIII) by means of pyridine in dichloromethane and deprotected with TFA in the same solvent.
| 【1】 Colandrea, V.J.; Naylor, E.M.; Parmee, E.R.; et al.; Human beta3 adrenergic receptor agonists containing imidazolidinone and imidazolone benzenesulfonamides. Bioorg Med Chem Lett 1999, 9, 5, 755. |
| 【2】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 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) | 10027 | Benzyl (1S)-1-[[(3aR,4R,6R,6aR)-6-methoxy-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl]methyl]-3-butenyl(benzyl)carbamate | C28H35NO6 | 详情 | 详情 | |
| (II) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (III) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (IV) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (V) | 18961 | 4-(2-aminoethyl)aniline; 4-(2-aminoethyl)phenylamine | 13472-00-9 | C8H12N2 | 详情 | 详情 |
| (VI) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (VII) | 30449 | (1R)-2-[(4-aminophenethyl)[1-(tert-butoxy)vinyl]amino]-1-(3-pyridinyl)-1-ethanol | C21H29N3O2 | 详情 | 详情 | |
| (VIII) | 30450 | 4-[3-(3-cyclopentylpropyl)-2-oxo-1-imidazolidinyl]benzenesulfonyl chloride | C17H23ClN2O3S | 详情 | 详情 |
合成路线3
该中间体在本合成路线中的序号：(II)The chlorination of 2-acetylpyridine (I) with N-chlorosuccinimide in ethereal HCl gives 2-(chloroacetyl)pyridine (II), which is reduced with (-)-B-chlorodiisopinocampheylborane [(-)-DIP-Cl] in THF yielding (R)-2-chloro-1-(2-pyridyl)ethanol (III). The epoxidation of (III) with K2CO3 in refluxing acetone affords the epoxide (IV), which is condensed with 4-(2-aminoethyl)aniline (V) in refluxing methanol providing (R)-2-[2-(4-aminophenyl)ethylamino]-1-(2-pyridyl)ethanol (VI). The selective protection of the secondary amino group of (VI) with tert-butoxycarbonyl anhydride in THF gives the carbamate (VII) (1), which is condensed with 4-[2-(2-cyclopentylethyl)oxazol-5-yl]phenylsulfonyl chloride (VIII) in pyridine yielding the sulfonamide (IX). Finally, this compound is deprotected with trifluoroacetic acid.
| 【1】 Ok, H.O.; Candelore, M.R.; Reigle, L.B.; et al.; Substituted oxazole benzenesulfonamides as potent human beta3 adrenergic receptor agonists. 217th ACS Natl Meet (March 21 1999, Anaheim) 1999, Abst MEDI 114. |
| 【2】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 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) | 12027 | 1-(3-Pyridinyl)-1-ethanone; 1-(3-Pyridinyl)ethanone | 350-03-8 | C7H7NO | 详情 | 详情 |
| (II) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (III) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (IV) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (V) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (VI) | 26553 | tert-butyl 4-aminophenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C20H27N3O3 | 详情 | 详情 | |
| (VII) | 26718 | 4-[2-(2-cyclopentylethyl)-1,3-oxazol-5-yl]benzenesulfonyl chloride | C16H18ClNO3S | 详情 | 详情 | |
| (VIII) | 26719 | tert-butyl 4-[([4-[2-(2-cyclopentylethyl)-1,3-oxazol-5-yl]phenyl]sulfonyl)amino]phenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C36H44N4O6S | 详情 | 详情 |
合成路线4
该中间体在本合成路线中的序号：(II)3-Acetylpyridine (I) was converted to the hydrochloride salt and then chlorinated with N-chlorosuccinimide to afford (chloroacetyl)pyridine (II). Asymmetric reduction of (II) by means of (-)-B-chlorodiisopinocampheylborane in THF produced the (R)-alcohol (III), which was cyclized to oxirane (IV) upon heating with K2CO3 in acetone. Epoxide (IV) opening with 4-aminophenethyl amine (V) in boiling MeOH gave aminoalcohol (VI). Then, selective protection of the aliphatic amine of (VI) as the tert-butyl carbamate yielded the target intermediate (VII). In a similar procedure, 2-chloro-5-acetylpyridine (VIII) was brominated employing dibromobarbituric acid in THF to afford bromide (IX), which was enantioselectively reduced to the (R)-alcohol (X). After cyclization of (X) to epoxide (XI), its opening with 4-nitrophenethyl amine (XII) yielded aminoalcohol (XIII). This was protected as the N-Boc derivative (XIV) and then, hydrogenation of the nitro group of (XIV) with concomitant halogen hydrogenolysis in the presence of Raney Nickel provided an alternative access to intermediate (VII).
| 【1】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 【2】 Smith, R.G. (Merck & Co., Inc.); Combination therapy for the treatment of diabetes and obesity. JP 1999515027; WO 9716189 . |
| 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) | 12027 | 1-(3-Pyridinyl)-1-ethanone; 1-(3-Pyridinyl)ethanone | 350-03-8 | C7H7NO | 详情 | 详情 |
| (II) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (III) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (IV) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (V) | 18961 | 4-(2-aminoethyl)aniline; 4-(2-aminoethyl)phenylamine | 13472-00-9 | C8H12N2 | 详情 | 详情 |
| (VI) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (VII) | 26553 | tert-butyl 4-aminophenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C20H27N3O3 | 详情 | 详情 | |
| (VIII) | 26555 | 1-(6-chloro-3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (IX) | 26557 | 2-bromo-1-(6-chloro-3-pyridinyl)-1-ethanone | C7H5BrClNO | 详情 | 详情 | |
| (X) | 26558 | (1R)-2-bromo-1-(6-chloro-3-pyridinyl)-1-ethanol | C7H7BrClNO | 详情 | 详情 | |
| (XI) | 26559 | 2-chloro-5-[(2R)oxiranyl]pyridine | C7H6ClNO | 详情 | 详情 | |
| (XII) | 26560 | 4-nitrophenethylamine | 24954-67-4 | C8H10N2O2 | 详情 | 详情 |
| (XIII) | 26561 | (1R)-1-(6-chloro-3-pyridinyl)-2-[(4-nitrophenethyl)amino]-1-ethanol | C15H16ClN3O3 | 详情 | 详情 | |
| (XIV) | 26562 | tert-butyl (2R)-2-(6-chloro-3-pyridinyl)-2-hydroxyethyl(4-nitrophenethyl)carbamate | C20H24ClN3O5 | 详情 | 详情 |
合成路线5
该中间体在本合成路线中的序号：(II)3-Acetylpyridine (I) was chlorinated employing N-chlorosuccinimide, and the resulting chloroketone (II) was enantioselectively reduced with (-)-B-chlorodiisopinocampheylborane (DIP-Cl) to furnish the chiral chlorohydrin (III). Intramolecular cyclization of (III) in the presence of K2CO3 in refluxing acetone produced (R)-(3-pyridyl)oxirane (IV). Further ring opening with 4-aminophenethylamine (V) gave rise to diaminoalcohol (VI), which was selectively proteced with Boc2O at the aliphatic amino group, yielding carbamate (VII). In a related alternative procedure, 2-chloro-5-acetylpyridine (VIII) was brominated to (IX) by means of dibromobarbituric acid (DBBA), followed by reduction of bromoketone (IX) with (-)-DIP-Cl. The resulting (R)-bromohydrin (X) was converted to epoxide (XI) by treatment with NaOH, and subsequent ring opening with 4-nitrophenethylamine (XII) provided aminoalcohol (XIII). Protection of the amino group of (XIII) with Boc2O afforded carbamate (XIV). Further reduction of the nitro group of (XIV) with simultaneous hydrogenolysis of the halogen atom furnished the target intermediate (VII).
| 【1】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 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) | 12027 | 1-(3-Pyridinyl)-1-ethanone; 1-(3-Pyridinyl)ethanone | 350-03-8 | C7H7NO | 详情 | 详情 |
| (II) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (III) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (IV) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (V) | 18961 | 4-(2-aminoethyl)aniline; 4-(2-aminoethyl)phenylamine | 13472-00-9 | C8H12N2 | 详情 | 详情 |
| (VI) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (VII) | 26553 | tert-butyl 4-aminophenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C20H27N3O3 | 详情 | 详情 | |
| (VIII) | 26555 | 1-(6-chloro-3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (IX) | 26557 | 2-bromo-1-(6-chloro-3-pyridinyl)-1-ethanone | C7H5BrClNO | 详情 | 详情 | |
| (X) | 26558 | (1R)-2-bromo-1-(6-chloro-3-pyridinyl)-1-ethanol | C7H7BrClNO | 详情 | 详情 | |
| (XI) | 26559 | 2-chloro-5-[(2R)oxiranyl]pyridine | C7H6ClNO | 详情 | 详情 | |
| (XII) | 26560 | 4-nitrophenethylamine | 24954-67-4 | C8H10N2O2 | 详情 | 详情 |
| (XIII) | 26561 | (1R)-1-(6-chloro-3-pyridinyl)-2-[(4-nitrophenethyl)amino]-1-ethanol | C15H16ClN3O3 | 详情 | 详情 | |
| (XIV) | 26562 | tert-butyl (2R)-2-(6-chloro-3-pyridinyl)-2-hydroxyethyl(4-nitrophenethyl)carbamate | C20H24ClN3O5 | 详情 | 详情 |
合成路线6
该中间体在本合成路线中的序号：(II)Chlorination of 3-acetylpyridine (I) by means of N-chlorosuccinimide (NCS) and HCl/HOAc in ethyl ether affords chloroacetyl derivative (II), which is then reduced with (-)-B-chlorodiisopinocampheylborane ((-)-DIP-Cl) and Et3N in THF to yield ethanol (III). Alcohol (III) is treated with K2CO3 in refluxing acetone to provide (R)-(3-pyridyl)oxirane (IV), which is then condensed with 4-aminophenethylamine (V) to give derivative (VI). N-Protection of (VI) by means of Boc2O in THF furnishes Boc derivative (VII), which is coupled to benzenesulfonyl chloride (VIII) in CH2Cl2 in the presence of pyridine to afford benzene sulfonamide (IX), which is then treated with H2S and Et3N in pyridine to yield thiocarboxamide derivative (X). Derivative (X) is then condensed in refluxing EtOH with chloromethylketone (XII), which can be obtained by reaction of 4-(trifluoromethyl)benzoyl chloride (XI) first with diazomethane (CH2N2) and then with HCl in ether. Finally, the N-Boc group is removed by means of TFA in CH2Cl2 to provide the target compound.
| 【1】 Fisher, M.H.; Naylor, E.M.; Ok, D.; Weber, A.E.; Shih, T.; Ok, H. (Merck & Co., Inc.); Substd. sulfonamides as selective beta3 agonists for the treatment of diabetes and obesity. EP 0757674; JP 1997512275; US 5541197; US 5561142; WO 9529159 . |
| 【3】 Mathvink, R.J.; Parmee, E.R.; Weber, A.E.; Tolman, S. (Merck & Co., Inc.); Thiazole benzenesulfonamides as beta3 agonists for the treatment of diabetes and obesity. EP 0968209; US 6011048; WO 9832753 . |
| 【2】 Mathvink, R.J.; Chitty, D.; Tolman, J.S.; et al.; Potent, selective, and orally bioavailable 3-pyridylethanolamine beta3 adrenergic receptor agonists possessing a thiazole benzenesulfonamide pharmacophore. 220th ACS Natl Meet (Aug 20 2000, Washington DC) 2000, Abst MEDI 302. |
| 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) | 12027 | 1-(3-Pyridinyl)-1-ethanone; 1-(3-Pyridinyl)ethanone | 350-03-8 | C7H7NO | 详情 | 详情 |
| (II) | 26549 | 2-chloro-1-(3-pyridinyl)-1-ethanone | C7H6ClNO | 详情 | 详情 | |
| (III) | 26550 | (1R)-2-chloro-1-(3-pyridinyl)-1-ethanol | C7H8ClNO | 详情 | 详情 | |
| (IV) | 26551 | 3-[(2R)oxiranyl]pyridine | C7H7NO | 详情 | 详情 | |
| (V) | 18961 | 4-(2-aminoethyl)aniline; 4-(2-aminoethyl)phenylamine | 13472-00-9 | C8H12N2 | 详情 | 详情 |
| (VI) | 26552 | (1R)-2-[(4-aminophenethyl)amino]-1-(3-pyridinyl)-1-ethanol | C15H19N3O | 详情 | 详情 | |
| (VII) | 26553 | tert-butyl 4-aminophenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C20H27N3O3 | 详情 | 详情 | |
| (VIII) | 29284 | 4-cyanobenzenesulfonyl chloride | 49584-26-1 | C7H4ClNO2S | 详情 | 详情 |
| (IX) | 29285 | tert-butyl 4-[[(4-cyanophenyl)sulfonyl]amino]phenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C27H30N4O5S | 详情 | 详情 | |
| (X) | 44829 | tert-butyl 4-([[4-(aminocarbothioyl)phenyl]sulfonyl]amino)phenethyl[(2R)-2-hydroxy-2-(3-pyridinyl)ethyl]carbamate | C27H32N4O5S2 | 详情 | 详情 | |
| (XI) | 44830 | 4-(trifluoromethyl)benzoyl chloride | 329-15-7 | C8H4ClF3O | 详情 | 详情 |
| (XII) | 44831 | 2-chloro-1-[4-(trifluoromethyl)phenyl]-1-ethanone | C9H6ClF3O | 详情 | 详情 |