aerobic oxidative cyclization of β,γ-unsaturated hydrazones for the preparation of pyrazole derivatives has been developed. The hydrazonyl radical promoted the cyclization, along with a concomitant C═Cbondcleavage of β,γ-unsaturated hydrazones. This process has been verified via several control experiments, including a radical-trapping study, an 18O-labeling method, and the identification of the possible
Copper-mediated oxysulfonylation of alkenyl oximes with sodium sulfinates: a facile synthesis of isoxazolines featuring a sulfone substituent
作者:Li-Jing Wang、Manman Chen、Lin Qi、Zhidong Xu、Wei Li
DOI:10.1039/c7cc00090a
日期:——
A novel and efficient Cu(OAc)2-mediated oxysulfonylation of alkenyl oximes with sodium sulfonates was developed. The reactions are easy to conduct, occur under mild conditions, and form a broad range of...
Selective Oxyfunctionalization of Ketones Using 1-Oxopiperidinium Salt
作者:Tan Ren、You-Cheng Liu、Qing-Xiang Guo
DOI:10.1246/bcsj.69.2935
日期:1996.10
enolizable ketones. Regioselective α- or γ-oxygenated carbonyl compounds were obtained smoothly at ambient temperature in moderate to good yields. Oxyfunctionalization of (+)-carvone and (−)-carvone proceeded stereoselectively, and provided cis-product (5R, 6S)- and (5S, 6R)-2-cyclohexen-1-ones, respectively. Interestingly, unsymmetricalketones afforded isomeric α- and α′-oxygenated ketones, while allyl
A one-pot oxidation/allylation/oxidation sequence for the preparation of β,γ-unsaturated ketones directly from primary alcohols
作者:Catherine L. Moody、David S. Pugh、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2011.03.033
日期:2011.5
A one-pot oxidation/allylation/oxidation procedure has been developed for the conversion of primary alcohols into β,γ-unsaturated ketones. The methodology has been applied to a range of alcohols, and in some cases, isomerisation to produce the corresponding α,β-unsaturated ketones has been carried out.
Reaction of acid chlorides with lithium pentamethylcyclopentadienide afforded the corresponding pentamethyl-cyclopentadienyl ketones in high yield. These ketones were treated with an allylaluminum reagent to form the corresponding 3-butenyl alcohols. Removal of pentamethylcyclopentadiene upon heating or treatment with a catalytic amount of trichloroacetic acid yielded the corresponding β,γ-unsaturated