• English
  • 简体中文
Login Register
Current Location: Home > Feedback Help Print

【结 构 式】

【分子编号】44771

【品名】phenyl (2S,3R)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]-3-hydroxypentanoate

【CA登记号】

【 分 子 式 】C24H34O5Si

【 分 子 量 】430.61646

【元素组成】C 66.94% H 7.96% O 18.58% Si 6.52%

与该中间体有关的原料药合成路线共 2 条

合成路线1

该中间体在本合成路线中的序号:(IV)

Condensation of protected ketone (I) with 2-benzyloxy-1-trimethylsilyloxyphenoxyethane (II) by means of Sn(OTf)2 and chiral amine (III) in propionitrile affords aldolic reaction product (IV), which is then dehydroxylated by treatment with thiocarbonyl diimidazole (A) in THF followed by reduction with Bu3SnH in refluxing toluene to provide the protected hydroxyester (V). Reduction of the ester group of (V) with DIBAL in CH2Cl2 followed by Swern oxidation with (COCl)2, DMSO and Et3N in dichloromethane yields aldehyde (VI), which is then condensed with 2-methoxypropene (VII) and 2-methoxyaniline (VIII) in the presence of yterbium triflate (Yb(OTf)3) in THF/H2O to furnish a mixture of diastereoisomers from which anti-(IX) is separated. Derivative anti-(IX) is treated with HF in THF for TBS removal and cyclization is induced by reaction with PPh3 and CBr4 in CH2Cl2, affording piperidine (X). Next, treatment of (X) with cerium ammonium nitrate (CAN) in acetonitrile/H2O allows N-protecting group removal, giving piperidine derivative (XI). Alternatively, (XI) can be obtained as follows: Treatment of aldehyde (VI) with 2-methoxyaniline (VIII) and PMB-protected 2-methoxypropene (XII) in the presence of scandium trisdodecylsulfate (STDS) in THF/H2O yields a mixture of diastereoisomers from which anti-(XIII) is separated. Derivative anti-(XIII) is then converted into (XI) by following the same procedure as for the conversion of anti-(IX) into (XI). Derivative (XI) is then subjected to: (i) N-protection by means of Boc2O; (ii) treatment with lithium hexamethyl disilazide (LHMDS) followed by trimethylsilyl chloride (TMSCl); (iii) oxidation of the silylenol ether by means of MCPBA; and (iv) bromination with PPh3 and CBr4. After all these steps bromo derivative (XIV) is obtained. Finally, coupling of (XIV) with 4-hydroxyquinazoline (XV) using KOH followed by Boc removal by treatment with refluxing HCl furnishes the target compound.

1 Wataya, Y.; Ueno, M.; Suzuki, R.; Kim, H.-S.; Kobayashi, S.; Ishitani, H.; Catalytic asymmetric synthesis of antimalarial alkaloids febrifubine and isofebrifugine and their biological actvity. J Org Chem 1999, 64, 18, 6833.
2 Kobayashi, S.; Kim, H.-S.; Wataya, Y. (Japan Science and Technology Corp.); Febrifugine and isofebrifugine and processes for the preparation of both. EP 1076057; WO 0052005 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(A) 11990 Di(1H-imidazol-1-yl)methanethione; 1,1'-Thiocarbonyldiimidazole 6160-65-2 C7H6N4S 详情 详情
(I) 44768 4-[[tert-butyl(dimethyl)silyl]oxy]-2-butanone C10H22O2Si 详情 详情
(II) 44769 benzyl (Z)-2-phenoxy-2-[(trimethylsilyl)oxy]ethenyl ether; [[(Z)-2-(benzyloxy)-1-phenoxyethenyl]oxy](trimethyl)silane C18H22O3Si 详情 详情
(III) 44770 N-[[(2S)-1-methylpyrrolidinyl]methyl]-N-(1-naphthyl)amine; N-[[(2S)-1-methylpyrrolidinyl]methyl]-1-naphthalenamine 82160-07-4 C16H20N2 详情 详情
(IV) 44771 phenyl (2S,3R)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]-3-hydroxypentanoate C24H34O5Si 详情 详情
(V) 44773 phenyl (2S)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]pentanoate C24H34O4Si 详情 详情
(VI) 44774 (2S)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]pentanal C18H30O3Si 详情 详情
(VII) 17354 isopropenyl methyl ether; 2-methoxy-1-propene 116-11-0 C4H8O 详情 详情
(VIII) 25193 2-methoxyphenylamine; 2-methoxyaniline 517-28-2 C7H9NO 详情 详情
(IX) 44777   C27H42NO4Si 详情 详情
(X) 44778 1-[(2R,3S)-3-(benzyloxy)-1-(2-methoxyphenyl)piperidinyl]acetone C22H27NO3 详情 详情
(XI) 44779 1-[(2R,3S)-3-(benzyloxy)piperidinyl]acetone C15H21NO2 详情 详情
(XII) 44780 1-methoxy-4-(3-methoxy-3-butenyl)benzene; 4-(3-methoxy-3-butenyl)phenyl methyl ether C12H16O2 详情 详情
(XIII) 44781   C35H50NO5Si 详情 详情
(XIV) 44782 tert-butyl (2R,3S)-3-(benzyloxy)-2-(3-bromo-2-oxopropyl)-1-piperidinecarboxylate C20H28BrNO4 详情 详情
(XV) 44783 4-quinazolinol C8H6N2O 详情 详情

合成路线2

该中间体在本合成路线中的序号:(IV)

The enantioselective condensation of the silylated 4-hydroxy-2-butanone (I) with the silylated enol ester (II) by means of Sn(OTf)2 and the chiral pyrrolidine (III) gives the chiral benzylated trihydroxyester (IV), which is partially dehydroxylated with thiocarbonyl diimidazole (TCDI) and tributyltin hydride in refluxing toluene to yield the protected dihydroxy ester (V). The reduction of (V) with DIBAL in dichloromethane affords the corresponding alcohol (VI), which is oxidized with oxalyl chloride and TEA in DMSO/dichloromethane to provide the aldehyde (VII). The condensation of (VII) with the enol ether (IX) and 2-methoxyaniline (VIII) by means of Yb(OTf)3 in THF/water gives the beta aminoketone (X), which is cyclized by means of HF, PPh3, CBr4 and cerium ammonium nitrate (CAN) in acetonitrile/water to yield the chiral piperidine (XI). The bromination of (XI) with Br2 and HBr in HOAc affords the bromo derivative (XII), which is treated with Boc2O to provide the N-protected piperidine (XIII). The condensation of (XIII) with quinazolin-4(3H)-one (XIV) by means of KOH gives the adduct (XV), which is finally deprotected and cyclized by treatment with refluxing 6N HCl to afford the target isofebrifugine.

1 Wataya, Y.; Ueno, M.; Suzuki, R.; Kim, H.-S.; Kobayashi, S.; Ishitani, H.; Catalytic asymmetric synthesis of antimalarial alkaloids febrifubine and isofebrifugine and their biological actvity. J Org Chem 1999, 64, 18, 6833.
2 Kobayashi, S.; Kim, H.-S.; Wataya, Y. (Japan Science and Technology Corp.); Febrifugine and isofebrifugine and processes for the preparation of both. EP 1076057; WO 0052005 .
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) 44768 4-[[tert-butyl(dimethyl)silyl]oxy]-2-butanone C10H22O2Si 详情 详情
(II) 44769 benzyl (Z)-2-phenoxy-2-[(trimethylsilyl)oxy]ethenyl ether; [[(Z)-2-(benzyloxy)-1-phenoxyethenyl]oxy](trimethyl)silane C18H22O3Si 详情 详情
(III) 51268 N-(1-naphthyl)-N-[(2S)pyrrolidinylmethyl]amine; N-[(2S)pyrrolidinylmethyl]-1-naphthalenamine C15H18N2 详情 详情
(IV) 44771 phenyl (2S,3R)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]-3-hydroxypentanoate C24H34O5Si 详情 详情
(V) 44773 phenyl (2S)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]pentanoate C24H34O4Si 详情 详情
(VI) 41269 2-(2-fluoro-4'-hydroxy[1,1'-biphenyl]-4-yl)acetic acid C14H11FO3 详情 详情
(VII) 44774 (2S)-2-(benzyloxy)-5-[[tert-butyl(dimethyl)silyl]oxy]pentanal C18H30O3Si 详情 详情
(VIII) 25193 2-methoxyphenylamine; 2-methoxyaniline 517-28-2 C7H9NO 详情 详情
(IX) 17354 isopropenyl methyl ether; 2-methoxy-1-propene 116-11-0 C4H8O 详情 详情
(X) 41270 8-(acetamido)-2,3-dihydro-1,4-benzodioxine-5-carboxylic acid C11H11NO5 详情 详情
(XI) 51271 1-[(2S,3S)-3-(benzyloxy)piperidinyl]acetone C15H21NO2 详情 详情
(XII) 51272 1-[(2S,3S)-3-(benzyloxy)piperidinyl]-3-bromoacetone C15H20BrNO2 详情 详情
(XIII) 51273 tert-butyl (2S,3S)-3-(benzyloxy)-2-(3-bromo-2-oxopropyl)-1-piperidinecarboxylate C20H28BrNO4 详情 详情
(XIV) 14634 4(3H)-quinazolinone C8H6N2O 详情 详情
(XV) 51274 tert-butyl (2S,3S)-3-(benzyloxy)-2-[2-oxo-3-[4-oxo-3(4H)-quinazolinyl]propyl]-1-piperidinecarboxylate C28H33N3O5 详情 详情
Extended Information