Stereospecific syntheses of the Z–E and E–Z vinylogues of combretastatin A-4, and two B-ring related analogues, were achieved through a Suzuki–Miyaura coupling. As compared to CA4, the derivative with a phenyl moiety has shown increased potency in its ability to inhibit tubulin polymerisation.
Synthesis and Structure-Activity Relationships of Constrained Heterocyclic Analogues of Combretastatin A4
作者:Martin Arthuis、Renée Pontikis、Guy G. Chabot、Johanne Seguin、Lionel Quentin、Stéphane Bourg、Luc Morin-Allory、Jean-Claude Florent
DOI:10.1002/cmdc.201100154
日期:2011.9.5
A series of combretastatinA4 (CA4) analogues with a lactam or lactone ring fused to the trimethoxyphenyl or the B‐phenyl moiety were synthesized in an efficient and stereoselective manner by using a domino Heck–Suzuki–Miyaura coupling reaction. The vascular‐disrupting potential of these conformationally restricted CA4 analogues was assessed by various in vitro assays: inhibition of tubulin polymerization
A series of compounds related to combretastatin A-4 has been synthesized by a tandem Heck-carbocyclization/Suzuki coupling process. From various alkynamides and 3,4,5-trimethoxyphenyl boronic acid or the corresponding styryl derivative, (E)-3-arylmethyleneoxindoles (type I) and (EE)-3-alkylideneoxindoles (type II) were efficiently obtained in a stereoselective manner. Factors influencing yield and stereoselectivity are detailed. (C) 2007 Elsevier Ltd. All rights reserved.
We report herein a highly exo-selectiveintramolecularDiels–Alderreaction of alkenyl boronates which employs an N–B dative bond-involved bicyclic rigid tether. Complex C(sp3)-rich polycyclic molecules containing up to 8 stereocenters can be readily formed via an operationally simple two-step procedure.