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【结 构 式】

【分子编号】57184

【品名】(4R)-4-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-2-(trichloromethyl)-4,5-dihydro-1,3-oxazole; tert-butyl(dimethyl)silyl (1S)-2-methyl-1-[(4R)-2-(trichloromethyl)-4,5-dihydro-1,3-oxazol-4-yl]propyl ether

【CA登记号】

【 分 子 式 】C14H26Cl3NO2Si

【 分 子 量 】374.80958

【元素组成】C 44.86% H 6.99% Cl 28.38% N 3.74% O 8.54% Si 7.49%

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:(VIII)

The condensation of isobutyraldehyde (I) with triethyl phosphonoacetate (II) by means of NaH in THF gives 4-methyl-2-pentenoic acid ethyl ester (III), which is reduced with DIBAL in THF to yield the allyl alcohol (IV). The Sharpless asymmetric epoxidation of (IV) by means of Ti(O-iPr)4, (+)-diethyl tartrate ((+)-DET) and tBu-OOH in toluene affords the epoxy alcohol (V), which is treated with trichloroacetonitrile and DBU to provide the acetimidate (VI). The cyclization of (VI) by means of triethyl aluminum chloride in dichloromethane gives the oxazoline (VII), which is silylated with Tbdms-OTf and TEA in dichloromethane to afford the silyl ether (VIII). The cleavage of the oxazoline ring of (VIII) by means of HCl in THF yields the chiral amino alcohol (IX), which is protected with Tbdms-OTf as before to afford the silylated amine (X). The monoalkylation of (X) with 1,3-dibromo-2-methylpropene (XI) and Cs-OH in DMF provides the secondary amine (XII). The cyclization of (XII) by means of KHMDS in toluene/ethyl ether gives the non isolated intermediate (XIII) that rearranges to the pyrroline (XIV). The reaction of (XIV) with TPAP and NMO in acetonitrile yields the cyclic imine (XV), which is oxidized with NaClO2 to the 1-chloropyrrolin-2-one (XVI). The dechlorination of (XVI) by means of NaBH4 affords the pyrrolinone (XVII), which is selectively monodesilylated with TBAF in THF to provide the primary alcohol (XVIII). The cyclization of (XVIII) with benzaldehyde dimethylacetal and Ts-OH in refluxing toluene gives the bicyclic pyrrolo oxazole (XIX), which is finally deprotected by means of TBAF in THF to yield the target bicyclic intermediate (XX) (see scheme no. 23327701c intermediate (XXXII)).

1 Green, M.P.; et al.; An enantioselective formal synthesis of the proteasome inhibitor (+)-lactacystin. Tetrahedron Lett 2002, 43, 37, 6609.
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) 13226 2-Methylpropanal; Isobutyraldehyde 78-84-2 C4H8O 详情 详情
(II) 10019 Ethyl 2-(diethoxyphosphoryl)acetate; Triethyl phosphonoacetate 867-13-0 C8H17O5P 详情 详情
(III) 57196 ethyl (E)-4-methyl-2-pentenoate C8H14O2 详情 详情
(IV) 43593 (E)-4-methyl-2-penten-1-ol C6H12O 详情 详情
(V) 57181 [(2S,3S)-3-isopropyloxiranyl]methanol C6H12O2 详情 详情
(VI) 57182 [(2S,3S)-3-isopropyloxiranyl]methyl 2,2,2-trichloroethanimidoate C8H12Cl3NO2 详情 详情
(VII) 57183 (1S)-2-methyl-1-[(4R)-2-(trichloromethyl)-4,5-dihydro-1,3-oxazol-4-yl]-1-propanol C8H12Cl3NO2 详情 详情
(VIII) 57184 (4R)-4-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-2-(trichloromethyl)-4,5-dihydro-1,3-oxazole; tert-butyl(dimethyl)silyl (1S)-2-methyl-1-[(4R)-2-(trichloromethyl)-4,5-dihydro-1,3-oxazol-4-yl]propyl ether C14H26Cl3NO2Si 详情 详情
(IX) 57185 (2R,3S)-2-amino-3-{[tert-butyl(dimethyl)silyl]oxy}-4-methyl-1-pentanol C12H29NO2Si 详情 详情
(X) 57186 (5S,6R)-5-isopropyl-2,2,3,3,9,9,10,10-octamethyl-4,8-dioxa-3,9-disilaundecan-6-amine; (1R,2S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-({[tert-butyl(dimethyl)silyl]oxy}methyl)-3-methylbutylamine C18H43NO2Si2 详情 详情
(XI) 57187 (E)-1,3-dibromo-2-methyl-1-propene C4H6Br2 详情 详情
(XII) 57188 N-[(E)-3-bromo-2-methyl-2-propenyl]-N-[(1R,2S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-({[tert-butyl(dimethyl)silyl]oxy}methyl)-3-methylbutyl]amine; (5S,6R)-N-[(E)-3-bromo-2-methyl-2-propenyl]-5-isopropyl-2,2,3,3,9,9,10,10-octamethyl-4,8-dioxa-3,9-disilaundecan-6-amine C22H48BrNO2Si2 详情 详情
(XIII) 57189 (5S,6S)-N-[(Z)-3-bromo-2-methyl-2-propenyl]-5-isopropyl-2,2,3,3,9,9,10,10-octamethyl-4,8-dioxa-3,9-disilaundecan-6-amine; N-[(Z)-3-bromo-2-methyl-2-propenyl]-N-[(1S,2S)-2-{[tert-butyl(dimethyl)silyl]oxy}-1-({[tert-butyl(dimethyl)silyl]oxy}methyl)-3-methylbutyl]amine C22H48BrNO2Si2 详情 详情
(XIV) 57190 (2R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-4-methyl-2,5-dihydro-1H-pyrrole; tert-butyl(dimethyl)silyl (1S)-1-[(2R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-4-methyl-2,5-dihydro-1H-pyrrol-2-yl]-2-methylpropyl ether C22H47NO2Si2 详情 详情
(XV) 57191 tert-butyl(dimethyl)silyl (1S)-1-[(2R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-4-methyl-2H-pyrrol-2-yl]-2-methylpropyl ether; (2R)-2-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-4-methyl-2H-pyrrole C22H45NO2Si2 详情 详情
(XVI) 57192 (5R)-5-({[tert-butyl(dimethyl)silyl]oxy}methyl)-5-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-1-chloro-3-methyl-1,5-dihydro-2H-pyrrol-2-one C22H44ClNO3Si2 详情 详情
(XVII) 57193 (5R)-5-({[tert-butyl(dimethyl)silyl]oxy}methyl)-5-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-3-methyl-1,5-dihydro-2H-pyrrol-2-one C22H45NO3Si2 详情 详情
(XVIII) 57194 (5R)-5-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-5-(hydroxymethyl)-3-methyl-1,5-dihydro-2H-pyrrol-2-one C16H31NO3Si 详情 详情
(XIX) 57195 (3S,7aS)-7a-((1S)-1-{[tert-butyl(dimethyl)silyl]oxy}-2-methylpropyl)-6-methyl-3-phenyl-1,7a-dihydro-5H-pyrrolo[1,2-c][1,3]oxazol-5-one C23H35NO3Si 详情 详情
(XX) 43612 (3S,7aR)-7a-[(1S)-1-hydroxy-2-methylpropyl]-6-methyl-3-phenyl-1,7a-dihydro-5H-pyrrolo[1,2-c][1,3]oxazol-5-one C17H21NO3 详情 详情
Extended Information