Total synthesis of pamamycin 607: applications of remote asymmetric induction in organic synthesis
作者:Olivier Germay、Naresh Kumar、Eric J Thomas
DOI:10.1016/s0040-4039(01)00921-2
日期:2001.7
A total synthesis of pamamycin 607 1 is described. The synthesis of the C(1)–C(18) fragment involved the tin(IV) chloride-promoted reaction between (3R)-3-(N-methyl)tosylaminohexanal 18 and the allylstannane 4 followed by cyclisation and reductive removal of the phenylselanyl group to give the tetrahydrofuran 20 which was taken through to the aldehyde 21. Aldol addition of the lithium enolate derived
描述了帕马霉素607 1的全合成。C(1)–C(18)片段的合成涉及(3 R)-3-(N-甲基)甲苯磺酰基氨基己醛18与烯丙基锡烷4之间氯化锡(IV)促进的反应,然后环化并还原除去苯基硒基得到四氢呋喃20,将其转化为醛21。在该醛中向该醛中醛化衍生自2,6-二甲基苯基丙酸酯的烯醇锂,然后进行O-甲硅烷基化,得到甲硅烷基醚25作为主要产物。将其转化为醛31其与二锡烷4反应,环化和还原得到双-四氢呋喃33。交换N-保护基,氢解和氧化,然后得到酸34。这使用醇酯化42,它已经从醛制备35和锡烷ENT - 4使用类似于化学,得到酯43。脱保护,得到开环-酸44和环化,Ñ -deprotection和Ñ -methylation给pamamycin 607 1。