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【结 构 式】 
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【分子编号】62849 【品名】 【CA登记号】 |
【 分 子 式 】C34H51LiO5Si 【 分 子 量 】574.80244 【元素组成】C 71.05% H 8.94% Li 1.21% O 13.92% Si 4.89% |
合成路线1
该中间体在本合成路线中的序号：(XLII)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 |