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【结 构 式】

【分子编号】14956

【品名】tert-butyl[[(2R,3R)-3-methyloxiranyl]methoxy]diphenylsilane; tert-butyl(diphenyl)silyl [(2R,3R)-3-methyloxiranyl]methyl ether

【CA登记号】

【 分 子 式 】C20H26O2Si

【 分 子 量 】326.51074

【元素组成】C 73.57% H 8.03% O 9.8% Si 8.6%

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:(III)

Synthesis of the intermediate butyraldehyde (X): The Sharpless asymmetric epoxidation of 2(E)-buten-1-ol by means of t-Bu-OOH and D-(-9-diisopropyl tartrate gives the epoxy alcohol (II), which is treated with Tbdps-Cl, TEA and DMAP to yield the silyl ether (III) The condensation of (III) with 1,3-dithiane (IV) by means of BuLi in THF/HMPA affords the cyclic thioketal (V), which is deprotected by means of TBAF in THF, affording the diol (VI). The reaction of (VI) with 4-methoxybenzaldehyde dimethylacetal (VII) by means of TsOH in DMF provides the benzylidene ketal (VIII), which is submitted to a selective opening by means of DIBAL in dichloromethane to give the secondary benzyl ether (IX). Finally this compound is oxidized with SO3/Pyridine and TEA in DMSO/dichloromethane to obtain the target intermediate, the chiral butyraldehyde (X).

1 Chen, K.; Formal total synthesis of (-)-FK506. Diss Abstr Int B - Sci Eng 1993, 53, 9, 4663.
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) 54882 2-Butene-1-ol; Crotyl Alcohol; trans-Propenylcarbinol 504-61-0 C4H8O 详情 详情
(II) 57330 [(2R,3R)-3-methyloxiranyl]methanol C4H8O2 详情 详情
(III) 14956 tert-butyl[[(2R,3R)-3-methyloxiranyl]methoxy]diphenylsilane; tert-butyl(diphenyl)silyl [(2R,3R)-3-methyloxiranyl]methyl ether C20H26O2Si 详情 详情
(IV) 42372 1,3-dithiane 505-23-7 C4H8S2 详情 详情
(V) 57331 (2S,3S)-1-{[tert-butyl(diphenyl)silyl]oxy}-3-(1,3-dithian-2-yl)-2-butanol C24H34O2S2Si 详情 详情
(VI) 57332 (2S,3S)-3-(1,3-dithian-2-yl)-1,2-butanediol C8H16O2S2 详情 详情
(VII) 26485 1-(dimethoxymethyl)-4-methoxybenzene 2186-92-7 C10H14O3 详情 详情
(VIII) 57333 (4S)-4-[(1S)-1-(1,3-dithian-2-yl)ethyl]-2-(4-methoxyphenyl)-1,3-dioxolane; 4-{(4S)-4-[(1S)-1-(1,3-dithian-2-yl)ethyl]-1,3-dioxolan-2-yl}phenyl methyl ether C16H22O3S2 详情 详情
(IX) 57334 (2S,3S)-3-(1,3-dithian-2-yl)-2-[(4-methoxybenzyl)oxy]-1-butanol C16H24O3S2 详情 详情
(X) 57335 (2S,3S)-3-(1,3-dithian-2-yl)-2-[(4-methoxybenzyl)oxy]butanal C16H22O3S2 详情 详情

合成路线2

该中间体在本合成路线中的序号:(II)

A partial synthesis of rapamycin has been reported: The condensation of sulfone (I) with epoxide (II) by means of butyllithium followed by desulfonation with Na/Hg gives the partially protected diol (III), which is treated with methanesulfonyl chloride and NaH to afford the epoxide (IV). Ring opening of epoxide (IV) with LiI and BF3.Et2O followed by protection of the resulting alcohol with PMBOC(NH)CCl3 yields the primary iodo compound (V). The condensation of (V) with the fully protected dihydroxyaldehyde (VI) (see later) by means of butyllithium in THF/HMPT gives the fully protected trihydroxyketone (VII), which is hydrolyzed with camphorsulfonic acid (CSA) to the corresponding gemdiol and reprotected with pivaloyl chloride (the primary alcohol) and tert-butyldimethylsilyl trifluoromethanesulfonate (the secondary alcohol), yielding a new fully protected trihydroxyketone (VIII). Elimination of the pivaloyl group with DIBAL and the dithiane group with MeI/CaCO3 affords the hydroxyketone (IX), which is finally oxidized with oxalyl chloride to the ketoaldehyde (X), the C(27)-C(42) fragment [the C(12)-C(15) fragment with the C(12)-substituent based on the IUPAC nomenclature recommendations]. The fully protected dihydroxyaldehyde (VI) is obtained as follows: The reaction of methyl 3-hydroxy-2(R)-methylpropionate (XI) with BPSCl followed by reduction with LiBH4 to the corresponding alcohol and oxidation with oxalyl chloride gives the aldehyde (XII), which is protected with propane-1,3-dithiol and BF3.Et2O to afford the dithiane compound (XIII). Elimination of the silyl group with TBAF followed by esterification with tosyl chloride, reaction with NaI and, finally, with sodium phenylsulfinate gives the sulfone (XIV), which is condensed with the partially protected dihydroxyaldehyde (XV), oxidized with oxalyl chloride and desulfonated with Al/Hg to afford the dithianyl ketone (XVI). The reaction of (XVI) with lithium hexamethyldisilylazane gives the corresponding enolate, which is treated with dimethyllithium cuprate to yield the fully protected unsaturated dihydroxyaldehyde (VI).

1 Leahy, J.W.; Smith, A.B.; McCauley, J.A.; Condon, S.M.; Leazer, J.L.; Maleczka, R.E.; Rapamycin synthetic studies. 1. Construction of the C(27)-C(42) subunit. Tetrahedron Lett 1994, 35, 28, 4907.
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
52385 [4-(methyloxy)phenyl]methyl 2,2,2-trichloroethanimidoate C10H10Cl3NO2 详情 详情
(I) 14955 triisopropyl([(1R,2R,4R)-2-methoxy-4-[(phenylsulfonyl)methyl]cyclohexyl]oxy)silane; [(1R,3R,4R)-3-methoxy-4-[(triisopropylsilyl)oxy]cyclohexyl]methyl phenyl sulfone C23H40O4SSi 详情 详情
(II) 14956 tert-butyl[[(2R,3R)-3-methyloxiranyl]methoxy]diphenylsilane; tert-butyl(diphenyl)silyl [(2R,3R)-3-methyloxiranyl]methyl ether C20H26O2Si 详情 详情
(III) 14957 (2S,3R)-1-[[tert-butyl(diphenyl)silyl]oxy]-4-[(1S,3R,4R)-3-methoxy-4-[(triisopropylsilyl)oxy]cyclohexyl]-3-methyl-2-butanol C37H62O4Si2 详情 详情
(IV) 14958 triisopropyl[((1R,2R,4S)-2-methoxy-4-[(2R)-2-[(2S)oxiranyl]propyl]cyclohexyl)oxy]silane; (1R,2R,4S)-2-methoxy-4-[(2R)-2-[(2S)oxiranyl]propyl]cyclohexyl triisopropylsilyl ether C21H42O3Si 详情 详情
(V) 14959 [((1R,2R,4S)-4-[(2R,3R)-4-iodo-3-[(4-methoxybenzyl)oxy]-2-methylbutyl]-2-methoxycyclohexyl)oxy](triisopropyl)silane; (1R,2R,4S)-4-[(2R,3R)-4-iodo-3-[(4-methoxybenzyl)oxy]-2-methylbutyl]-2-methoxycyclohexyl triisopropylsilyl ether C29H51IO4Si 详情 详情
(VI) 14960 (4R)-4-[(E,3R)-3-(1,3-dithian-2-yl)-1-methyl-1-butenyl]-2,2-dimethyl-1,3-dioxolane C14H24O2S2 详情 详情
(VII) 14961 (1R,2R,4S)-4-[(2R,3S)-4-(2-[(1R,2E)-3-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-1-methyl-2-butenyl]-1,3-dithian-2-yl)-3-[(4-methoxybenzyl)oxy]-2-methylbutyl]-2-[(triisopropylsilyl)oxy]cyclohexanol C42H72O6S2Si 详情 详情
(VIII) 14962 (2R,3E,5R)-2-[[tert-butyl(dimethyl)silyl]oxy]-5-[2-((2S,3R)-2-[(4-methoxybenzyl)oxy]-4-[(1S,3R,4R)-3-methoxy-4-[(triisopropylsilyl)oxy]cyclohexyl]-3-methylbutyl)-1,3-dithian-2-yl]-3-methyl-3-hexenyl pivalate C51H92O7S2Si2 详情 详情
(IX) 14963 (2R,3S,6R,7E,9R)-9-[[tert-butyl(dimethyl)silyl]oxy]-10-hydroxy-3-[(4-methoxybenzyl)oxy]-1-[(1S,3R,4R)-3-methoxy-4-[(triisopropylsilyl)oxy]cyclohexyl]-2,6,8-trimethyl-7-decen-5-one C43H78O7Si2 详情 详情
(X) 14964 (2R,3E,5R,8S,9R)-1-[[tert-butyl(dimethyl)silyl]oxy]-7-[(4-methoxybenzyl)oxy]-9-[(1S,3R,4R)-3-methoxy-4-[(triisopropylsilyl)oxy]cyclohexyl]-2,4,8-trimethyl-5-oxo-3-decenoic 1,1-dimethylpropionic anhydride C48H84O9Si2 详情 详情
(XI) 14965 methyl 3-hydroxy-2-methylpropanoate; METHYL (S)-(+)-3-HYDROXY-2-METHYLPROPIONATE 80657-57-4 C5H10O3 详情 详情
(XII) 14966 (2R)-3-[[tert-butyl(diphenyl)silyl]oxy]-2-methylpropanal C20H26O2Si 详情 详情
(XIII) 14967 tert-butyl[[(2R)-2-(1,3-dithian-2-yl)propyl]oxy]diphenylsilane; tert-butyl(diphenyl)silyl (2R)-2-(1,3-dithian-2-yl)propyl ether C23H32OS2Si 详情 详情
(XIV) 14968 (2R)-2-(1,3-dithian-2-yl)propyl phenyl sulfone; 2-[(1R)-1-methyl-2-(phenylsulfonyl)ethyl]-1,3-dithiane C13H18O2S3 详情 详情
(XV) 14969 (4S)-2,2-dimethyl-1,3-dioxolane-4-carbaldehyde 22323-80-4 C6H10O3 详情 详情
(XVI) 14970 (3R)-1-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]-3-(1,3-dithian-2-yl)-1-butanone C13H22O3S2 详情 详情
Extended Information