A Pd(0)-catalyzed route to 13-methylidenefarnesyl diphosphate
作者:Richard A. Gibbs、Usha Krishnan
DOI:10.1016/s0040-4039(00)77157-7
日期:1994.4
The synthesis of the novel FPP analog 13-methylidenefarnesyl diphosphate 2 is described. The key step in the synthetic sequence involved the stereoselective coupling of enol triflate 8 with vinyltributyltin using Pd(AsPh(3))(2) and CuI as catalysts to afford primarily the desired cis-divinylester 7. It is also demonstrated that other 3-substituted famesyl analogs can be prepared by this Pd(0)catalyzed route.
A Stereoselective Palladium/Copper-Catalyzed Route to Isoprenoids: Synthesis and Biological Evaluation of 13-Methylidenefarnesyl Diphosphate
作者:Richard A. Gibbs、Usha Krishnan、Julia M. Dolence、C. Dale Poulter
DOI:10.1021/jo00129a023
日期:1995.12
The novel farnesyl diphosphate (FPP) analog 13-methylidenefarnesyl diphosphate (3-VFPP, 4) was designed as a potential mechanism-based inhibitor of the FPP-utilizing enzyme protein-farnesyl transferase (PFTase). A six-step stereoselective route to 3-VFPP is described. The key step in the synthetic sequence involved the stereoselective coupling of vinyl triflate 16 with vinyltributyltin using Pd(AsPh(3))(2) and CuI as catalysts to afford primarily the desired (Z)-divinyl ester 15. It was also demonstrated that other 3-substituted farnesyl analogs can be prepared in a highly stereoselective manner by this Pd(0)/CuI-catalyzed route. The presence of CuI significantly increases the stereoselectivity of the coupling reaction, and a possible mechanistic rationale for this observation is presented. Biological evaluation of 3-VFPP demonstrates that it is not a time-dependent inhibitor of recombinant yeast PFTase. Instead, 3-VFPP is an alternative substrate for this. enzyme that exhibits a K-m comparable to FPP but a k(cat) significantly lower than the natural substrate.
Synthesis and evaluation of 3- and 7-substituted geranylgeranyl pyrophosphate analogs
作者:Michelle Maynor、Sarah A. Scott、Emily L. Rickert、Richard A. Gibbs
DOI:10.1016/j.bmcl.2008.02.014
日期:2008.3
Protein prenyl transferases have been a focus of anti-cancer drug discovery in recent years due to their roles in post-translational modi. cation of small GTP binding proteins. Attention is now turning to the development of GGTase I inhibitors. Here, we present the synthesis and biological evaluation of four GGPP analogs versus mammalian GGTase I and the discovery that 7-allyl GGPP is a surprisingly efficient GGTase I substrate. (C) 2008 Elsevier Ltd. All rights reserved.