using Ti(O-i-Pr)4/l-(+)-DIPT as a catalyst produced anti epoxy alcohol with >99% ee as the sole product in 82% yield. A subsequent functional group manipulation, including removal of the PMB group, produced the alcohol, which upon Swern oxidation afforded anti 4-hydroxy-5-TBS-oxy enal via epoxide ring opening of the resulting aldehyde. The Horner–Wadsworth–Emmons reaction was used to add the C9–C10 enal
                                    使用C1–C10二烯与已知的C11–C22 salt盐的Wittig反应可实现立体异构
D4(Rv
D4)的立体选择性合成。通过相应
乙炔酮的不对称转移加氢反应,然后进行Red-Al还原,在95%ee中合成了对应于C1-C8部分的(S,E)-对映体(S)-10。使用Ti(O- i -Pr)4 / l对该醇进行急剧的环氧化-(+)-DI
PT作为催化剂生产的抗环氧醇,其ee> 99%为唯一产品,收率为82%。随后的官能团操作(包括除去PMB基团)产生了醇,该醇经Swern氧化,通过所得醛的环氧开环提供抗
4-羟基-5-TBS-氧烯醛。使用霍纳-沃兹沃思-埃蒙斯反应将C9-C10烯醛部分添加到该醛中,然后将生成的二烯与C11-C22 salt盐进行Wittig反应,以提供Rv
D4的整个结构。伯醇转化为甲酯,并用TBAF脱除三个TBS基团的保护基,得到5,17-二羟基-γ-内酯,将其
水解为Rv
D4。此外,CD