Use of heterocycles as chiral ligands and auxiliaries in asymmetric syntheses of sphingosine, sphingofungins B and F
作者:Shū Kobayashi、Takayuki Furuta
DOI:10.1016/s0040-4020(98)00484-0
日期:1998.8
prepared from 5 according to standard transformation. The chiral hydrophobic side chain (6) of sphingofungin B was synthesized using a catalytic asymmetric aldol reaction using chiral ligand 1-ent. Another key step in the total synthesis of sphingofungin B was a condensation of chiral aldehyde 7 and chiral heterocycle 2. Similarly, the reaction of chiral aldehyde 8 with heterocycle 3 was a key step for
D-赤型-鞘氨醇及其衍生物(二氢鞘氨醇,顺式鞘氨醇等),鞘氨醇B和F已经由简单的非手性化合物合成,使用杂环化合物作为关键的手性配体和助剂。5-苯甲氧基-4-乙炔基-2,2-二甲基-1,3-二恶烷(5位或5位)是合成鞘氨醇家族的关键中间体,是由1-三甲基甲硅烷基丙酸和乙烯酮甲硅烷基乙缩醛4制备的。 Sn(OTf)2-手性配体1或1-ent催化的不对称羟醛反应。鞘氨醇及其衍生物易于根据标准转化由5制备。手性疏水侧链(6)的鞘芬净B是通过手性配体1-ent催化的不对称醛缩反应合成的。全合成鞘氨醇单丁酯B的另一个关键步骤是手性醛7和手性杂环2的缩合。同样,手性醛8与杂环3的反应是合成鞘氨醇单胞菌F的关键步骤。在两种情况下,高度非对映选择性反应均能顺利进行,从而以高收率提供了相应的加合物。