The stereocontrolled total synthesis of altohyrtin A/spongistatin 1: the CD-spiroacetal segment
作者:Ian Paterson、Mark J. Coster、David Y.-K. Chen、Karl R. Gibson、Debra J. Wallace
DOI:10.1039/b504148a
日期:——
Stereocontrolled syntheses of the C16-C28 CD-spiroacetal subunit of altohyrtin A/spongistatin1 , relying on kinetic and thermodynamic control of the spiroacetal formation, are described. The kinetic control approach resulted in a slight preference (60 : 40) for the desired spiroacetal isomer. The thermodynamic approach allowed ready access to the desired spiroacetal by acid-promoted equilibration
依赖于螺缩醛形成的动力学和热力学控制,描述了altohyrtin A /海绵抑素1的C16-C28 CD-螺缩醛亚基的立体控制合成。动力学控制方法导致所希望的螺缩醛异构体稍微偏爱(60∶40)。通过热力学方法,可以通过酸促进的平衡,C23差向异构体的色谱分离以及不希望的异构体重新达到平衡条件,从而容易地获得所需的螺缩醛。这种可扩展的合成序列提供了数克的,因此能够成功完成altohyrtin A /海绵体抑素1的总合成,如本系列文章的第4部分所报道。
The total synthesis of swinholide A. Part 3: A stereocontrolled synthesis of (−)-pre-swinholide A.
作者:Ian Paterson、Richard A. Ward、Julian D. Smith、John G. Cumming、Kap-Sun Yeung
DOI:10.1016/0040-4020(95)00548-m
日期:1995.8
(−)-pre-swinholide A were devised based on the analysis in Scheme 1. In the first route, a boron-mediatedaldolreaction between the ethylketone 19 and the aldehyde 3 was used to construct the C15-C16 bond with moderate diastereoselectivity. In the second route, a Mukaiyama aldolreaction between the methyl ketone 54 and the aldehyde 4 introduced the C18-C19 bond with complete stereocontrol.
Stereocontrolled aldol additions to α-methylene-β-alkoxy aldehydes: Application to the synthesis of a C13C25 segment of bafilomycin A1
作者:Ian Paterson、Shelley Bower、Malcolm D. McLeod
DOI:10.1016/0040-4039(94)02205-p
日期:1995.1
A boron-mediated, syn-aldol coupling between ethyl ketone 8 and aldehyde 9, followed by directed hydrogenation at C-16 and acetonide hydrolysis, gives the C-13-C-25 segment 6 of bafilomycin A(1).
Total Synthesis of (-)-Preswinholide A
作者:Ian Paterson、Julian D. Smith、Richard A. Ward、John G. Cumming
DOI:10.1021/ja00085a050
日期:1994.3
Studies in marine macrolide synthesis: Synthesis of a C16C28 subunit of spongistatin 1 (altohyrtin A) incorporating the CD-spiroacetal moiety
作者:Ian Paterson、Debra J Wallace、Karl R Gibson
DOI:10.1016/s0040-4039(97)10483-x
日期:1997.12
The C16C28 ketone 3, containing the CD-spiroacetal of spongistatin1 (1), was prepared in 17 steps from aldehyde 9. Both thermodynamic and kinetic conditions were explored for controlling the CD-acetal configuration.