高度融合和立体控制的方式合成了功能完备的altohyrtin A /海绵抑素1的C29-C51南半球,其中包含E和F环四氢吡喃环和不饱和侧链。合成该salt盐的关键步骤包括四个高度非对映选择性,受底物控制的硼醇醛缩醛反应,以建立关键的CC键和相应的立体中心,其中通过利用远程异构体实现引入氯二烯侧链和带有C47羟基的中心。 F环四氢吡喃的立体诱导。
Stereocontrolled Total Synthesis of (+)-Altohyrtin A/Spongistatin 1 Financial support was provided by the EPSRC (GR/L41646), Cambridge Commonwealth Trust (Scholarship to M.J.C.), EC (Marie Curie Postdoctoral Fellowship to J.L.A.), DFG (Postdoctoral Fellowship to T.T.), NSERC-Canada (Postdoctoral Fellowship to R.M.O.), Churchill College (Research Fellowship to D.J.W.), Kingapos;s College and Sims Fund, Cambridge (Scholarship to D.Y.K.C.). We also thank Merck and AstraZeneca Pharmaceuticals for generous support, and Dr. Anne Butlin (AZ) and Dr. Nick Bampos (Cambridge) for valuable assistance.
作者:Ian Paterson、David Y.-K. Chen、Mark J. Coster、Jose L. Aceña、Jordi Bach、Karl R. Gibson、Linda E. Keown、Renata M. Oballa、Thomas Trieselmann、Debra J. Wallace、Andrew P. Hodgson、Roger D. Norcross
antimitotic macrolide, altohyrtin A/spongistatin1 shows great promise in cancer chemotherapy but its extreme scarcity in the natural sponges has halted its further preclinical development. A highly stereocontrolled totalsynthesis, which exploits boron-mediated aldol bond constructions, has been realized to provide, for the first time, a useful amount of synthetic material.
作为一种异常有效的抗有丝分裂大环内酯,altohyrtin A / spongistatin 1在癌症化学疗法中显示出广阔的前景,但其天然海绵中的极度稀缺性阻止了其进一步的临床前开发。已经实现了利用硼介导的羟醛键结构的高度立体控制的全合成,首次提供了有用量的合成材料。
Deracemization of Acyclic α-Hydroxy Ketone Derivatives by Dynamic Resolution Using an Optically Active Host Compound
The dynamic resolution of racemic acyclic α-hydroxy ketone derivatives is accomplished using an optically active host compound, TADDOL, under basic conditions to give the corresponding optically active ketones.
The stereocontrolled total synthesis of altohyrtin A/spongistatin 1: the southern hemisphere EF segment
作者:Ian Paterson、Mark J. Coster、David Y.-K. Chen、José L. Aceña、Jordi Bach、Linda E. Keown、Thomas Trieselmann
DOI:10.1039/b504149j
日期:——
The fully functionalised C29-C51 southern hemisphere of altohyrtin A/spongistatin1 , incorporating the E- and F-ring tetrahydropyran rings and the unsaturated side chain, has been synthesised in a highly convergent and stereocontrolled manner. Key steps in the synthesis of this phosphonium salt include four highly diastereoselective, substrate-controlled, boron aldol reactions to establish key C-C
高度融合和立体控制的方式合成了功能完备的altohyrtin A /海绵抑素1的C29-C51南半球,其中包含E和F环四氢吡喃环和不饱和侧链。合成该salt盐的关键步骤包括四个高度非对映选择性,受底物控制的硼醇醛缩醛反应,以建立关键的CC键和相应的立体中心,其中通过利用远程异构体实现引入氯二烯侧链和带有C47羟基的中心。 F环四氢吡喃的立体诱导。
Optical Resolution of Acyclic α-Hydroxy Ketone Derivatives by Inclusion Complexation
new method for the preparation of optically active acyclic α-hydroxy ketone derivatives by thermodynamic resolution using a chiral host compound is described. We examined the resolution of racemic 2-benzyloxy-3-pentanone with chiral host compounds in various solvents. After optimization of the reaction conditions, it has become apparent that the opticalresolution could occur only under certain strict
描述了一种使用手性主体化合物通过热力学拆分制备光学活性无环 α-羟基酮衍生物的新方法。我们研究了外消旋 2-benzyloxy-3-pentanone 与手性主体化合物在各种溶剂中的拆分。在优化反应条件后,很明显,光学拆分只能在溶剂、主体化合物和底物浓度的某些严格条件下发生。在室温下在 MeOH-H 2 O (1:1) 中搅拌带有环己基环的 (-)-TADDOL 的酮悬浮液,该悬浮液源自 L-酒石酸乙酯,产生具有高对映选择性的包合物,得到 (S) - 含高达 99% ee 的酮。另一方面,从滤液中得到的(R)-酮的ee可以通过使用(+)-TADDOL的相同程序得到改善;最后,得到几乎光学纯形式的酮的两种对映异构体。通过 ESI-TOFMS 分析形成的复合体假设主客比为 1:1。这种拆分过程也适用于其他基材,以提供相应的光学活性酮。