A Metal-Free Synthesis of 2-Alkyl(or Aryl) Thiomethyl-2-cyclohexenones from Cyclic<i>Morita</i>-<i>Baylis</i>-<i>Hillman</i>Bromides
作者:Narjes Baioui、Ahlem Abidi、Farhat Rezgui
DOI:10.1002/hlca.201600136
日期:2016.9
catalyst or an expensive additive is described herein. Treatment of the MBH bromides with various thiols or ethane‐1,2‐dithiol in the presence of Et3N regioselectively affords the corresponding 2‐alkyl(or aryl) thiomethyl‐2‐cyclohexenones or the perhydro benzo[1,4]dithiepinone, respectively, in moderate to good yields (40 – 73%). The reaction is rapid and carried out in THF at room temperature.
Transition-metal-free nucleophilic allylic substitutions of Morita–Baylis–Hillman bromides with aliphatic and aromatic amines
作者:Narjes Baioui、Haitham Elleuch、Farhat Rezgui
DOI:10.1080/00397911.2016.1228109
日期:2016.11.16
preparation of functionalized allylic amines under mild, transition-metal-free conditions from the reaction of Morita–Baylis–Hillman (MBH) bromides with amines is described herein. The treatment of the MBH bromides with various amines in the presence of NaI and Et3N in aqueous acetone solution and at room temperature affords the corresponding functionalized allyl amines in moderate to good yields (45–87%)
摘要本文描述了在温和、无过渡金属条件下通过 Morita-Baylis-Hillman (MBH) 溴化物与胺反应制备功能化烯丙胺的简单方案。在 NaI 和 Et3N 存在下,在丙酮水溶液和室温下,用各种胺处理 MBH 溴化物,以中等至良好的产率(45-87%)得到相应的官能化烯丙基胺。反应迅速并在室温下进行。图形概要
Regioselective Barbier reactions of 2-bromomethylcyclohexenone
作者:Renuka Manchanayakage、Scott T. Handy
DOI:10.1016/j.tetlet.2007.03.158
日期:2007.5
Although the addition of crotyl or prenyl organometallicreagents has certainly found application in organic synthesis, the use of other non-symmetric allylic organometallicreagents has not received much attention. In part this is due to potential problems in controlling the regioselectivity of the addition products. We have noted that the tin and zinc reagents derived from 2-bromomethylcyclohexenone
Electrophile-Controlled Regiodivergent Palladium-Catalyzed Imidoylative Spirocyclization of Cyclic Alkenes
作者:Shumin Ding、Yue Pu、Jiao Lin、Haixia Zhao、Qiang Tang、Jian Wang
DOI:10.1021/acs.orglett.4c00181
日期:2024.3.8
spirocyclization of isocyano cycloalkenes has been developed, offering efficient and selective approaches toward spirocyclic hydropyrrole scaffolds. 2-Azaspiro-1,7-dienes could be obtained through a “chain-walking” process with aryl/vinyl iodides as electrophiles, while the normal Heck product 2-azaspiro-1,6-dienes were selectively generated when aryl triflates were used as the coupling partner of isocyanides
diseases. However, due to the same active reaction site of the sulfydryl group in biothiols, it is inevitable to bear a confused signal of mutual influence on both nonselective detection and discriminate detection, which presents a serious challenge of accurately sensing or imaging the three biothiols. By assigning an α,β-unsaturated ketone moiety as a Michaelacceptor to trigger thiols to complete the irreversible