基于锡 (II) 催化的不对称醛醇反应(手性路易斯酸控制合成(CLAC 合成)),已经开发了鞘氨醇 B 和 F 及其立体异构体的明确合成路线。使用催化量的手性源进行有效的对映选择性合成以及该策略在合成鞘氨醇家族中的有效性已被成功证明。使用合成的鞘氨醇 B 的立体异构体,揭示了其立体化学与其 SPT 抑制活性的相关性。
Asymmetric Total Synthesis of Botcinins C, D, and F
摘要:
Stereoselective total synthesis of botcinins C, D, and F is effectively carried out through asymmetric aldol reactions, 6-endo ring closure, and Sml(12)-mediated 3,4-trans or -cis stereoselective intramolecular Reformatsky reaction. Rapid esterification of the main skeleton of botcinins with the chiral side chain using MNBA and DMAP produced botcinin D, an antifungal chemical against a pathogen of rice blast disease.
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 chiralligand 1-ent. Another keystep 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 keystep for