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。
Stereoselective allylation of aldehydes on solid support and its application in biology-oriented synthesis (BIOS)
作者:Victor Mamane、Ana B. García、Jayant D. Umarye、Torben Lessmann、Stefan Sommer、Herbert Waldmann
DOI:10.1016/j.tet.2007.01.041
日期:2007.6
allylation of aldehydes on solid support is reported. Different kinds of chiral allylboron reagents with complementary direction of stereoinduction were applied successfully in this reagent-controlled transformation. The homoallylic alcohol products are generated with high levels of stereoselectivity and in high yields. The crotylation of aldehydes on solid support employing (E)- and (Z)-Ipc2crotylborane
The stereocontrolled total synthesis of altohyrtin A/spongistatin 1: the AB-spiroacetal segment
作者:Ian Paterson、Mark J. Coster、David Y.-K. Chen、Renata M. Oballa、Debra J. Wallace、Roger D. Norcross
DOI:10.1039/b504146e
日期:——
The convergent synthesis of the C1-C15 AB-spiroacetal subunit of altohyrtin A/spongistatin 1 is described. This highly stereocontrolled synthesis relies on matched boron aldol reactions of chiral methyl ketones, under Ipc(2)BCl mediation, to establish the C5, C9 and C11 stereocentres, and formation of the desired thermodynamic spiroacetal under acidic conditions. The scalable synthetic sequence developed
描述了altyryrtin A /海绵抑素1的C1-C15 AB-螺缩醛亚基的收敛合成。这种高度立体控制的合成依赖于手性甲基酮在Ipc(2)BCl介导下的匹配的硼醛醇缩醛反应,以建立C5,C9和C11立体中心,并在酸性条件下形成所需的热力学螺缩醛。如第4部分所述,开发出的可扩展的合成序列可提供数克量的,从而能够成功完成altohyrtin A / spongistatin 1的总合成。
Studies in marine macrolide synthesis: Stereocontrolled synthesis of the AB-spiroacetal subunit of spongistatin 1 (altohyrtin A)
作者:Ian Paterson、Renata M. Oballa、Roger D. Norcross
DOI:10.1016/0040-4039(96)01961-2
日期:1996.11
The C1C13 subunit 2, containing the AB-spiroacetal ring system of spongistatin1 (1), was prepared in 11 steps with 90% ds from 3-benzyloxypropanal. Key steps include (i) the aldol reaction between 4 and 11 using (−)-Ipc2BCl and (ii) the spiroacetalisation, 3 → 14.
含有海绵状抑素1(1)的AB-螺缩醛环系统的C 1 = C 13亚基2可以11步制备,其中3-苄氧基丙醛的ds为90%。关键步骤包括(i)使用(-)-Ipc 2 BCl在4和11之间进行羟醛反应,以及(ii)螺缩醛化3 → 14。
Convenient Synthesis of Stable Aldimine−Borane Complexes, Chiral δ-Amino Alcohols, and γ-Substituted GABA Analogues from Nitriles
作者:P. Veeraraghavan Ramachandran、Debanjan Biswas
DOI:10.1021/ol0710919
日期:2007.8.1
A one-pot synthesis of stable aldimine-trialkylborane adducts, the first synthesis of C- and N-deuterated imine-borane complexes, and their application for a highly enantioselective (84-99% ee) synthesis of delta-amino alcohols and gamma-substituted gamma-aminobutyric acids, including deuterated amino acids from nitriles, are described.