|
【结 构 式】 
|
【分子编号】42644 【品名】(5R,6S,7Z,10S,11R)-11-[(1R,2S,3S,4Z)-2-[(4-methoxybenzyl)oxy]-1,3-dimethyl-4,6-heptadienyl]-5-[(1S)-2-[(4-methoxybenzyl)oxy]-1-methylethyl]-2,2,3,3,6,8,10,13,13,14,14-undecamethyl-4,12-dioxa-3,13-disila-7-pentadecene; (2S,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-11-[(4-methoxybenzyl)oxy]-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatrienyl 4-methoxybenzyl ether 【CA登记号】n/a |
【 分 子 式 】C50H84O6Si2 【 分 子 量 】837.38436 【元素组成】C 71.72% H 10.11% O 11.46% Si 6.71% |
合成路线1
该中间体在本合成路线中的序号：(XXXIV)The target compound has been obtained as follows: The condensation of ester intermediate (XI) with aldehyde intermediate (XXI) by means of lithium 2,2,6,6-tetramethylpiperidide (Li-TMP) gives the addition compound (XXXI), which is reduced at the ester group with LiAlH4, yielding the carbinol (XXXII). The reduction of this carbinol by sulfonation with mesitylenesulfonyl chloride, followed by reduction with LiAlH4, affords the corresponding methyl derivative (XXXIII), which is silylated at the secondary OH group with TBDMS-Otf, providing the fully protected compound (XXXIV). Elimination of the Pmb protecting groups of (XXXIV) with DDQ yields the diol (XXXV), which is selectively oxidized at the primary OH group to the corresponding aldehyde (XXXVI) by means of TEMPO. The Wittig condensation of (XXXVI) with phosphonate (XXXVII) by means of K2CO3 and 18-C-6 affords the octadecatetraenoic ester (XXXVIII), which is treated with trichloroacetyl isocyanate and K2CO3 to provide the carbamate (XXXIX). The reduction of the ester group of (XXXIX) by means of DIBAL gives the primary alcohol (XL), which is finally oxidized with DMP to the expected intermediate aldehyde (XLI).
| 【1】 Paterson, I.; et al.; Total synthesis of the antimicrotubule agent (+)-discodermolide using boron-mediated aldol reactions of chiral ketones. Angew Chem. Int Ed Engl 2000, 39, 2, 377. |
| 【2】 Paterson, I.; Florence, G.J.; Synthesis of (+)-discodermolide and analogues by control of asymmetric induction in aldol reactions of gamma-chiral (Z)-enals. Tetrahedron Lett 2000, 41, 35, 6935. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XI) | 42622 | 2,6-dimethylphenyl (Z,6S,7R,8S)-7-[[tert-butyl(dimethyl)silyl]oxy]-9-[(4-methoxybenzyl)oxy]-4,6,8-trimethyl-4-nonenoate | C34H52O5Si | 详情 | 详情 | |
| (XXI) | 42632 | (2R,3S,4S,5Z)-3-[(4-methoxybenzyl)oxy]-2,4-dimethyl-5,7-octadienal | C18H24O3 | 详情 | 详情 | |
| (XXXI) | 42641 | 2,6-dimethylphenyl (2S,3S,4S,5S,6S,7Z)-2-[(Z,4S,5R,6S)-5-[[tert-butyl(dimethyl)silyl]oxy]-7-[(4-methoxybenzyl)oxy]-2,4,6-trimethyl-2-heptenyl]-3-hydroxy-5-[(4-methoxybenzyl)oxy]-4,6-dimethyl-7,9-decadienoate | C52H76O8Si | 详情 | 详情 | |
| (XXXII) | 42642 | (2R,3R,4S,5S,6S,7Z)-2-[(Z,4S,5R,6S)-5-[[tert-butyl(dimethyl)silyl]oxy]-7-[(4-methoxybenzyl)oxy]-2,4,6-trimethyl-2-heptenyl]-5-[(4-methoxybenzyl)oxy]-4,6-dimethyl-7,9-decadiene-1,3-diol | C44H70O7Si | 详情 | 详情 | |
| (XXXIII) | 42643 | (3Z,5S,6S,7S,8R,9S,11Z,13S,14R,15S)-14-[[tert-butyl(dimethyl)silyl]oxy]-6,16-bis[(4-methoxybenzyl)oxy]-5,7,9,11,13,15-hexamethyl-1,3,11-hexadecatrien-8-ol | C44H70O6Si | 详情 | 详情 | |
| (XXXIV) | 42644 | (5R,6S,7Z,10S,11R)-11-[(1R,2S,3S,4Z)-2-[(4-methoxybenzyl)oxy]-1,3-dimethyl-4,6-heptadienyl]-5-[(1S)-2-[(4-methoxybenzyl)oxy]-1-methylethyl]-2,2,3,3,6,8,10,13,13,14,14-undecamethyl-4,12-dioxa-3,13-disila-7-pentadecene; (2S,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-11-[(4-methoxybenzyl)oxy]-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatrienyl 4-methoxybenzyl ether | n/a | C50H84O6Si2 | 详情 | 详情 |
| (XXXV) | 42645 | (2S,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatriene-1,11-diol | n/a | C34H68O4Si2 | 详情 | 详情 |
| (XXXVI) | 42646 | (2R,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-11-hydroxy-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatrienal | n/a | C34H66O4Si2 | 详情 | 详情 |
| (XXXVII) | 41856 | methyl 2-[bis(2,2,2-trifluoroethoxy)phosphoryl]acetate | 88738-78-7 | C7H9F6O5P | 详情 | 详情 |
| (XXXVIII) | 42647 | methyl (2Z,4S,5S,6S,7Z,10S,11R,12R,13S,14S,15Z)-5,11-bis[[tert-butyl(dimethyl)silyl]oxy]-13-hydroxy-4,6,8,10,12,14-hexamethyl-2,7,15,17-octadecatetraenoate | n/a | C37H70O5Si2 | 详情 | 详情 |
| (XXXIX) | 42648 | methyl (2Z,4S,5S,6S,7Z,10S,11R,12R,13S,14S,15Z)-13-[(aminocarbonyl)oxy]-5,11-bis[[tert-butyl(dimethyl)silyl]oxy]-4,6,8,10,12,14-hexamethyl-2,7,15,17-octadecatetraenoate | n/a | C38H71NO6Si2 | 详情 | 详情 |
| (XL) | 42649 | (1S,2R,3R,4S,6Z,8S,9S,10S,11Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-13-hydroxy-2,4,6,8,10-pentamethyl-1-[(1S,2Z)-1-methyl-2,4-pentadienyl]-6,11-tridecadienyl carbamate | C37H71NO5Si2 | 详情 | 详情 | |
| (XLI) | 42650 | (1S,2R,3R,4S,6Z,8S,9S,10S,11Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-2,4,6,8,10-pentamethyl-1-[(1S,2Z)-1-methyl-2,4-pentadienyl]-13-oxo-6,11-tridecadienyl carbamate | C37H69NO5Si2 | 详情 | 详情 |
合成路线2
该中间体在本合成路线中的序号：(XLVIII)The reaction of (XXXVIII) with Li-TMP and LiBr in THF gives the lithium enolate (XLII), which is condensed with the chiral octadienoic aldehyde intermediate (XXV) in THF to yield the aldol adduct (XLIII). The reduction of the phenyl ester group of (XLIII) by means of LiAlH4 in THF affords the diol (XLIV), which is submitted to a regioselective esterification with mesitylenesulfonyl chloride (XLV) to provide the sulfonate (XLVI). The deoxygenation of (XLVI) by means of LiAlH4 gives the desired alcohol (XLVII), which is protected with Tbdms-OTf and TEA to yield the fully protected compound (XLVIII). The selective deprotection of (XLVIII) by means of DDQ in dichloromethane affords the diol (XLIX), which is selectively oxidated at the primary OH group with TEMPO and PhI(OAc)2 to provide the aldehyde (L). The condensation of (L) with phosphonate (LI) by means of K2CO3 and 18-C-6 in toluene furnishes the chiral octadecatetraenoic ester (LII).
| 【1】 Paterson, I.; Florence, G.J.; Gerlach, K.; Scott, J.P.; Sereinig, N.; A practical synthesis of (+)-discodermolide and analogues: Fragment union by complex aldol reactions. J Am Chem Soc 2001, 123, 39, 9535. |
| 中间体序号 | 中间体编号 | 品名 | CAS号 | 分子式 | 供应商 | 用于合成 |
|---|---|---|---|---|---|---|
| (XXV) | 42632 | (2R,3S,4S,5Z)-3-[(4-methoxybenzyl)oxy]-2,4-dimethyl-5,7-octadienal | C18H24O3 | 详情 | 详情 | |
| (XXXVIII) | 42622 | 2,6-dimethylphenyl (Z,6S,7R,8S)-7-[[tert-butyl(dimethyl)silyl]oxy]-9-[(4-methoxybenzyl)oxy]-4,6,8-trimethyl-4-nonenoate | C34H52O5Si | 详情 | 详情 | |
| (XLII) | 62849 | C34H51LiO5Si | 详情 | 详情 | ||
| (XLIII) | 42641 | 2,6-dimethylphenyl (2S,3S,4S,5S,6S,7Z)-2-[(Z,4S,5R,6S)-5-[[tert-butyl(dimethyl)silyl]oxy]-7-[(4-methoxybenzyl)oxy]-2,4,6-trimethyl-2-heptenyl]-3-hydroxy-5-[(4-methoxybenzyl)oxy]-4,6-dimethyl-7,9-decadienoate | C52H76O8Si | 详情 | 详情 | |
| (XLIV) | 42642 | (2R,3R,4S,5S,6S,7Z)-2-[(Z,4S,5R,6S)-5-[[tert-butyl(dimethyl)silyl]oxy]-7-[(4-methoxybenzyl)oxy]-2,4,6-trimethyl-2-heptenyl]-5-[(4-methoxybenzyl)oxy]-4,6-dimethyl-7,9-decadiene-1,3-diol | C44H70O7Si | 详情 | 详情 | |
| (XLV) | 41158 | 2,4,6-trimethylbenzenesulfonyl chloride | 773-64-8 | C9H11ClO2S | 详情 | 详情 |
| (XLVI) | 62850 | (2R,3R,4S,5S,6S,7Z)-2-{(Z,4S,5R,6S)-5-{[tert-butyl(dimethyl)silyl]oxy}-7-[(4-methoxybenzyl)oxy]-2,4,6-trimethyl-2-heptenyl}-3-hydroxy-5-[(4-methoxybenzyl)oxy]-4,6-dimethyl-7,9-decadienyl 2,4,6-trimethylbenzenesulfonate | C53H80O9SSi | 详情 | 详情 | |
| (XLVII) | 42643 | (3Z,5S,6S,7S,8R,9S,11Z,13S,14R,15S)-14-[[tert-butyl(dimethyl)silyl]oxy]-6,16-bis[(4-methoxybenzyl)oxy]-5,7,9,11,13,15-hexamethyl-1,3,11-hexadecatrien-8-ol | C44H70O6Si | 详情 | 详情 | |
| (XLVIII) | 42644 | (5R,6S,7Z,10S,11R)-11-[(1R,2S,3S,4Z)-2-[(4-methoxybenzyl)oxy]-1,3-dimethyl-4,6-heptadienyl]-5-[(1S)-2-[(4-methoxybenzyl)oxy]-1-methylethyl]-2,2,3,3,6,8,10,13,13,14,14-undecamethyl-4,12-dioxa-3,13-disila-7-pentadecene; (2S,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-11-[(4-methoxybenzyl)oxy]-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatrienyl 4-methoxybenzyl ether | n/a | C50H84O6Si2 | 详情 | 详情 |
| (XLIX) | 42645 | (2S,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatriene-1,11-diol | n/a | C34H68O4Si2 | 详情 | 详情 |
| (L) | 42646 | (2R,3R,4S,5Z,8S,9R,10R,11S,12S,13Z)-3,9-bis[[tert-butyl(dimethyl)silyl]oxy]-11-hydroxy-2,4,6,8,10,12-hexamethyl-5,13,15-hexadecatrienal | n/a | C34H66O4Si2 | 详情 | 详情 |
| (LI) | 27698 | methyl 2-(diethoxyphosphoryl)acetate | 1067-74-9 | C7H15O5P | 详情 | 详情 |
| (LII) | 42647 | methyl (2Z,4S,5S,6S,7Z,10S,11R,12R,13S,14S,15Z)-5,11-bis[[tert-butyl(dimethyl)silyl]oxy]-13-hydroxy-4,6,8,10,12,14-hexamethyl-2,7,15,17-octadecatetraenoate | n/a | C37H70O5Si2 | 详情 | 详情 |