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【结 构 式】

【分子编号】44483

【品名】diethyl (E,4S,5R,6R)-4-(benzyloxy)-6-[[tert-butyl(dimethyl)silyl]oxy]-5,7,7-trimethyl-2-octenedioate

【CA登记号】

【 分 子 式 】C28H46O6Si

【 分 子 量 】506.75514

【元素组成】C 66.36% H 9.15% O 18.94% Si 5.54%

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:(XI)

Synthesis of intermediate (XVI): The condensation of 3(S)-(phenyldimethylsilyl)-4(E)-hexenoic acid methyl ester (I) with 2-(tert-butyldimethylsilyloxy)acetaldehyde (II) by means of Tms-OBn, Tms-OTf and BF3/Et2O in dichloromethane gives the 3(E)-heptenoic ester (III), which is ozonolyzed with O3 and pyridine in methanol/dichloromethane to yield the aldehyde (IV). The condensation of (IV) with the silyl ketal (V) by means of TiCl4 in dichloromethane affords the partially protected trihydroxyester (VI), which is silylated with Tbdms-OTf and lutidine in dichloromethane to provide the fully protected ester (VII). Regioselective monodesilylation of (VII) by means of TBAF/HOAc in THF gives the primary alcohol (VIII), which is oxidized with oxalyl chloride to the corresponding aldehyde (IX). The condensation of (IX) with phosphorane (X) in refluxing benzene yields the octenedioic diester (XI), which is methylated with Me2CuLi and Tms-Cl in THF, affording the tetramethyl diester (XII). The two ester groups of (XII) were easily differentiated by a reduction with DIBAL in dichloromethane, providing the 8-hydroxyoctanal derivative (XIII), which was silylated with TBdms-Cl and imidazole in DMF to give the fully protected aldehyde (XIV). Finally, this compound was subjected to a Wittig olefination reaction with methyltriphenylphosphonium bromide (XV) and NaHMDS in THF to yield the desired intermediate (XVI).

1 Panek, J.S.; Zhu, B.; Total synthesis of apothilone A. Org Lett 2000, 2, 17, 2575.
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) 44474 methyl (3S,4E)-3-[dimethyl(phenyl)silyl]-4-hexenoate C15H22O2Si 详情 详情
(II) 44475 2-[[tert-butyl(diphenyl)silyl]oxy]acetaldehyde C18H22O2Si 详情 详情
(III) 44476 methyl (E,5S,6R)-6-(benzyloxy)-7-[[tert-butyl(diphenyl)silyl]oxy]-5-methyl-3-heptenoate C32H40O4Si 详情 详情
(IV) 44477 (2R,3R)-3-(benzyloxy)-4-[[tert-butyl(diphenyl)silyl]oxy]-2-methylbutanal C28H34O3Si 详情 详情
(V) 44478 1-Ethoxy-2-methyl-1-trimethylsiloxypropene;1-Ethoxy-2-methyl-1-(trimethylsilyloxy)propene;1-Ethoxy-2-methyl-1-(trimethylsilyl)oxy-1-propene;1-ethoxy-2-methyl-1-propenyl trimethylsilyl ether; [(1-ethoxy-2-methyl-1-propenyl)oxy](trimethyl)silane ;dimethylketene ethyl trimethylsilyl acetal 31469-16-6 C9H20O2Si 详情 详情
(VI) 44479 ethyl (3R,4S,5R)-5-(benzyloxy)-6-[[tert-butyl(diphenyl)silyl]oxy]-3-hydroxy-2,2,4-trimethylhexanoate C34H46O5Si 详情 详情
(VII) 44480 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-6-[[tert-butyl(diphenyl)silyl]oxy]-2,2,4-trimethylhexanoate C40H60O5Si2 详情 详情
(VIII) 44481 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-6-hydroxy-2,2,4-trimethylhexanoate C24H42O5Si 详情 详情
(IX) 44482 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,2,4-trimethyl-6-oxohexanoate C24H40O5Si 详情 详情
(X) 14182 ethyl 2-(triphenyl-lambda(5)-phosphanylidene)acetate; (Carbethoxymethylene)triphenylphosphorane 1099-45-2 C22H21O2P 详情 详情
(XI) 44483 diethyl (E,4S,5R,6R)-4-(benzyloxy)-6-[[tert-butyl(dimethyl)silyl]oxy]-5,7,7-trimethyl-2-octenedioate C28H46O6Si 详情 详情
(XII) 44484 diethyl (3R,4R,5S,6S)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,2,4,6-tetramethyloctanedioate C29H50O6Si 详情 详情
(XIII) 44485 (3S,4S,5R,6R)-4-(benzyloxy)-6-[[tert-butyl(dimethyl)silyl]oxy]-8-hydroxy-3,5,7,7-tetramethyloctanal C25H44O4Si 详情 详情
(XIV) 44486 (3S,4S,5R,6R)-4-(benzyloxy)-6,8-bis[[tert-butyl(dimethyl)silyl]oxy]-3,5,7,7-tetramethyloctanal C31H58O4Si2 详情 详情
(XV) 30484 Methyl(triphenyl)phosphonium bromide 1779-49-3 C19H18BrP 详情 详情
(XVI) 44487 (5R)-5-[(1R,2S,3S)-2-(benzyloxy)-1,3-dimethyl-5-hexenyl]-2,2,3,3,6,6,9,9,10,10-decamethyl-4,8-dioxa-3,9-disilaundecane; benzyl (1S,2S)-1-((1R,2R)-2,4-bis[[tert-butyl(dimethyl)silyl]oxy]-1,3,3-trimethylbutyl)-2-methyl-4-pentenyl ether C32H60O3Si2 详情 详情

合成路线2

该中间体在本合成路线中的序号:(XI)

Synthesis of intermediate (XVI): The condensation of 3(S)-(phenyldimethylsilyl)-4(E)-hexenoic acid methyl ester (I) with 2-(tert-butyldimethylsilyloxy)acetaldehyde (II) by means of Tms-OBn, Tms-OTf and BF3/Et2O in dichloromethane gives the 3(E)-heptenoic ester (III), which is ozonolyzed with O3 and pyridine in methanol/dichloromethane to yield the aldehyde (IV). The condensation of (IV) with the silyl ketal (V) by means of TiCl4 in dichloromethane affords the partially protected trihydroxyester (VI), which is silylated with Tbdms-OTf and lutidine in dichloromethane to provide the fully protected ester (VII). Regioselective monodesilylation of (VII) by means of TBAF/AcOH in THF gives the primary alcohol (VIII), which is oxidized with oxalyl chloride to the corresponding aldehyde (IX). The condensation of (IX) with phosphorane (X) in refluxing benzene yields the octenedioic diester (XI), which is methylated with Me2CuLi and Tms-Cl in THF, affording the tetramethyl diester (XII). The two ester groups of (XII) were easily differentiated by a reduction with DIBAL in dichloromethane, providing the 8-hydroxyoctanal derivative (XIII), which was silylated with TBdms-Cl and imidazole in DMF to give the fully protected aldehyde (XIV). Finally, this compound was subjected to a Wittig olefination reaction with methyltriphenylphosphonium bromide (XV) and NaHMDS in THF to yield the desired intermediate (XVI).

1 Panek, J.S.; Zhu, B.; Total synthesis of apothilone A. Org Lett 2000, 2, 17, 2575.
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) 44474 methyl (3S,4E)-3-[dimethyl(phenyl)silyl]-4-hexenoate C15H22O2Si 详情 详情
(II) 44475 2-[[tert-butyl(diphenyl)silyl]oxy]acetaldehyde C18H22O2Si 详情 详情
(III) 44476 methyl (E,5S,6R)-6-(benzyloxy)-7-[[tert-butyl(diphenyl)silyl]oxy]-5-methyl-3-heptenoate C32H40O4Si 详情 详情
(IV) 44477 (2R,3R)-3-(benzyloxy)-4-[[tert-butyl(diphenyl)silyl]oxy]-2-methylbutanal C28H34O3Si 详情 详情
(V) 44478 1-Ethoxy-2-methyl-1-trimethylsiloxypropene;1-Ethoxy-2-methyl-1-(trimethylsilyloxy)propene;1-Ethoxy-2-methyl-1-(trimethylsilyl)oxy-1-propene;1-ethoxy-2-methyl-1-propenyl trimethylsilyl ether; [(1-ethoxy-2-methyl-1-propenyl)oxy](trimethyl)silane ;dimethylketene ethyl trimethylsilyl acetal 31469-16-6 C9H20O2Si 详情 详情
(VI) 44479 ethyl (3R,4S,5R)-5-(benzyloxy)-6-[[tert-butyl(diphenyl)silyl]oxy]-3-hydroxy-2,2,4-trimethylhexanoate C34H46O5Si 详情 详情
(VII) 44480 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-6-[[tert-butyl(diphenyl)silyl]oxy]-2,2,4-trimethylhexanoate C40H60O5Si2 详情 详情
(VIII) 44481 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-6-hydroxy-2,2,4-trimethylhexanoate C24H42O5Si 详情 详情
(IX) 44482 ethyl (3R,4R,5R)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,2,4-trimethyl-6-oxohexanoate C24H40O5Si 详情 详情
(X) 14182 ethyl 2-(triphenyl-lambda(5)-phosphanylidene)acetate; (Carbethoxymethylene)triphenylphosphorane 1099-45-2 C22H21O2P 详情 详情
(XI) 44483 diethyl (E,4S,5R,6R)-4-(benzyloxy)-6-[[tert-butyl(dimethyl)silyl]oxy]-5,7,7-trimethyl-2-octenedioate C28H46O6Si 详情 详情
(XII) 44484 diethyl (3R,4R,5S,6S)-5-(benzyloxy)-3-[[tert-butyl(dimethyl)silyl]oxy]-2,2,4,6-tetramethyloctanedioate C29H50O6Si 详情 详情
(XIII) 44485 (3S,4S,5R,6R)-4-(benzyloxy)-6-[[tert-butyl(dimethyl)silyl]oxy]-8-hydroxy-3,5,7,7-tetramethyloctanal C25H44O4Si 详情 详情
(XIV) 44486 (3S,4S,5R,6R)-4-(benzyloxy)-6,8-bis[[tert-butyl(dimethyl)silyl]oxy]-3,5,7,7-tetramethyloctanal C31H58O4Si2 详情 详情
(XV) 30484 Methyl(triphenyl)phosphonium bromide 1779-49-3 C19H18BrP 详情 详情
(XVI) 44487 (5R)-5-[(1R,2S,3S)-2-(benzyloxy)-1,3-dimethyl-5-hexenyl]-2,2,3,3,6,6,9,9,10,10-decamethyl-4,8-dioxa-3,9-disilaundecane; benzyl (1S,2S)-1-((1R,2R)-2,4-bis[[tert-butyl(dimethyl)silyl]oxy]-1,3,3-trimethylbutyl)-2-methyl-4-pentenyl ether C32H60O3Si2 详情 详情
Extended Information