Mechanism, regiochemistry, and stereochemistry of the insertion reaction of alkynes with methyl(2,4-pentanedionato)(triphenylphosphine)nickel. A cis insertion that leads to trans kinetic products
Photochemical Wittig reaction of quasi-phosphonium ylides
作者:Hideo Tomioka、Naoki Ichikawa、Hideki Murata
DOI:10.1039/c39920000193
日期:——
α-(Methoxycarbonyl)benzylidene quasi-phosphonium ylides, which are unreactive toward most carbonyl compounds, are found to undergo the Wittig reaction upon irradiation; irradiation with acyclic carbonyl compounds, e.g. benzaldehydes and acetophenones, afford the corresponding alkenes, whereas the reaction with cyclohexanone affords 1-phenyl-1-(methoxycarbonyl)hepta-1, 2-diene.
Mechanism, regiochemistry, and stereochemistry of the insertion reaction of alkynes with methyl(2,4-pentanedionato)(triphenylphosphine)nickel. A cis insertion that leads to trans kinetic products
作者:John M. Huggins、Robert G. Bergman
DOI:10.1021/ja00401a016
日期:1981.6
Stereospecific Electrophilic Fluorocyclization of α,β-Unsaturated Amides with Selectfluor
作者:Haiyang Fei、Zheyuan Xu、Hongmiao Wu、Lin Zhu、Hitesh B. Jalani、Guigen Li、Yao Fu、Hongjian Lu
DOI:10.1021/acs.orglett.0c00620
日期:2020.4.3
An efficient fluorocyclization of α,β-unsaturated amides through a formal halocyclization process is developed. The reaction proceeds undertransition-metal-freeconditions and leads to the formation of fluorinated oxazolidine-2,4-diones with excellent regio- and diastereoselectivity. The evaluation of the reaction mechanism based on preliminary experiments and density functional theory calculations