.ALPHA.,.BETA.-Epoxy sulfoxides as useful intermediates in organic synthesis. 26. Ring-opening fluorination of .ALPHA.,.BETA.-epoxy sulfoxides: A novel synthesis of .ALPHA.-fluoroketones.
Some novel routes to 1-hetero-substituted 1-vinylcyclopropanes
作者:Richard T. Lewis、William B. Motherwell
DOI:10.1016/s0040-4020(01)92235-5
日期:1992.2
carbonyl compounds and diethyl diazomethylphosphonate, can be efficiently trapped by alkenes to give alkylidene-cyclopropane adducts which undergo either [1,3] allylseleniderearrangement or oxidative selenoxide [2,3] sigmatropic rearrangement to produce 1-phenylseleno- or 1-hydroxy-1-vinylcyclopropanes respectively.
Negishi cross-coupling reactions are described. This method readily provides various enones from enol triflates and diorganozinc reagents with catalytic amounts of nickel(II) chloride–4,4′-dimethoxyl-2,2′-bipyridyl under carbonmonoxide atmosphere. The rate of carbonmonoxide insertion is increased by the addition of lithium or magnesium halides and the use of polar solvents. Alkenyl iodides can also
Enones from Acid Fluorides and Vinyl Triflates by Reductive Nickel Catalysis
作者:Feng-Feng Pan、Peng Guo、Chun-Ling Li、Peifeng Su、Xing-Zhong Shu
DOI:10.1021/acs.orglett.9b01164
日期:2019.5.17
A nickel-catalyzed reductive coupling between acid fluorides and vinyl triflates has been described. This method provides an efficient access to various enones and avoids the requirement for acyl or vinyl metallic reagents in the conventional approaches. The reaction proceeds with a broad range of acid fluorides and cyclic vinyl triflates, tolerating several functional groups. The utility of this synthetic
Generation, trapping, and adduct rearrangement of 3-phenylselenoalk-1-enylidene carbenes: a novel direct route to 1-hetero-substituted 1-vinylcyclopropanes
作者:Richard T. Lewis、William B. Motherwell
DOI:10.1039/c39880000751
日期:——
condensation of α-phenylseleno carbonyl compounds and diethyl diazomethylphosphonate, may be efficiently trapped to give alkylidene-cyclopropane adducts which undergo either [1,3]allyl selenide rearrangement or oxidative selenoxide[2,3]sigmatropic rearrangement to produce 1-heterosubstituted 1-vinylcyclopropanes.