Michael reactions of silylated nucleophiles with conjugated enones accompanied by silyl group transfer catalysed by copper(I) chloride under photoirradiation
Studies towards the Synthesis of Pentalenene: Mechanistic Insights into the Isomerization Phenomenon During RCM of Medium-Sized Rings
作者:Guillaume De Bo、István E. Markó
DOI:10.1002/ejoc.201001475
日期:2011.4
Isomerization issues have been encountered during the ring-closing metathesis (RCM) step of a new approach towardspentalenene. This paper describes the mechanisticinsights gained during the study of this side reaction from a substrate perspective. Isomerization issues have been encountered during the RCM step of a new approach towardspentalenene.
Studies towards the total synthesis of an epoxy isoprostane phospholipid, a potent activator of endothelial cells
作者:Michael E. Jung、Annika Kers、Ganesamoorthy Subbanagounder、Judith A. Berliner
DOI:10.1039/b209892j
日期:2003.1.7
We report studies toward the total synthesis of an epoxy isoprostane, namely the preparation of compound 9 which is an analogue of the elimination product 7 of the naturally occurring epoxy isoprostane 4 by a straightforward route using a three-component coupling, and have shown by several spectroscopic criteria that it closely resembles the natural material.
Mn(III)-mediated formal [3+3]-annulation has been developed using readily available vinylazides and cyclopropanols with a wide range of substituents. Vinylazides were successfully applied as a three-atom unit including one nitrogen to prepare pyridines and δ-lactams by the reactions with monocyclic cyclopropanols as well as to construct 2-azabicyclo[3.3.1] and 2-azabicyclo[4.3.1] frameworks with
Conjugate Addition Reactions of Allylic Copper Species Derived from Grignard Reagents: Synthetic and Spectroscopic Aspects
作者:Bruce H. Lipshutz、Claus Hackmann
DOI:10.1021/jo00103a042
日期:1994.12
A general study on the 1,4-addition chemistry of allyl, methallyl, crotyl, and prenyl Grignard-derived organocopper reagents has been conducted. While diallylic cuprates formed from such species are not effective Michael donors, the 1:1:1 combination of an allylic Grignard, CuBr.SMe(2), and Me(3)SiCl leads to high yields of 1,4-adducts. The stereo- and regiochemistry associated with the allylic ligand, where appropriate, has also been examined. Low temperature C-13 NMR studies provide insight as to the nature of these complexes.
A new 4-substituted-2-Cyclohexenone synthesis
作者:Kevin I. Booker-Milburn、David F. Thompson
DOI:10.1016/s0040-4039(00)79311-7
日期:1993.11
Conjugate addition of a variety of Grignard reagents to 2-cyclopentenone followed by cyclopropanation of the resulting enol ethers gave a range of substituted cyclopropyl silyl ethers in good yield. Treatment of these cyclopropyl silyl ethers with ferric chloride in DMF gave the one carbon ring expanded beta-chloro ketones which were eliminated to the corresponding 4- substituted-2-cyclohexenones.