Efficient Preparation of Terminal Conjugated Dienes by Coupling of Dienol Phosphates with Grignard Reagents under Iron Catalysis
作者:Gérard Cahiez、Vanessa Habiak、Olivier Gager
DOI:10.1021/ol800816f
日期:2008.6.1
An efficient new route to prepare stereoselectively terminal conjugated dienes by coupling Grignardreagents and dienol phosphates in the presence of Fe(acac)3 is described. The synthetic utility of this new iron-catalyzed procedure is illustrated by the synthesis of the pheromone of Diparopsis castanea according to a very expeditious strategy.
Nickel-Catalyzed Cross-Coupling of Dienyl Phosphates with Grignard Reagents in the Synthesis of 2-Substituted 1,3-Dienes
作者:A. Sofia. E. Karlström、Kenichiro Itami、Jan-E. Bäckvall
DOI:10.1021/jo982060h
日期:1999.3.1
Synthesis of cyclohexadienylstannanes – Novel example of vinylic SRN1 mechanism: A theoretical and experimental study
作者:Viviana B. Dorn、Mercedes A. Badajoz、María T. Lockhart、Alicia B. Chopa、Adriana B. Pierini
DOI:10.1016/j.jorganchem.2008.04.018
日期:2008.7
The reaction of trimethyltinsodium (1) with 1-(diethoxyphosphoryl) oxy-1,3-cyclohexadienes in liquid ammonia under irradiation affords the corresponding 1-trimethylstannylcyclohexadienes. We suggest that these reactions occur by an S(RN)1 mechanism. On the other hand, 2-(diethoxyphosphoryl)oxy-1,3-cyclohexadiene reacts very slowly towards 1 and the substitution product decomposes under the reaction conditions employed. Thus, structurally similar compounds do not behave in the same way under ET conditions. We suggest that this behavior is mainly due to differences in spin density of their radical anions, which affect their fragmentation rates. Our results are supported by computational calculations. (C) 2008 Elsevier B.V. All rights reserved.
Iron Dienylphosphate Tricarbonyl Complexes as Water-Soluble Enzyme-Triggered CO-Releasing Molecules (ET-CORMs)
Monodeprotection of two dimethyl phosphate derivatives with trimethylamine led to the tetramethylammonium salts of the (cyclohexadienyl methyl phosphate)Fe(CO)3 complexes. These compounds are the first water-soluble enzyme-trigged CO-releasingmolecules (ET-CORMs). The phosphatase-induced CO release was monitored by means of GC. The biological activity was assessed in different cellular assays. The compounds were