ABSTRACT p-TsOH-mediated the direct α-substitution of cyclic Morita–Baylis–Hillman alcohols with aliphatic and aromatic thiols in refluxing THF. The reaction proceeded with complete α-regioselectivity and provided the corresponding allyl sulfides in moderate to good yields. GRAPHICAL ABSTRACT
Substituted (
<i>E</i>
)‐2‐Methylene‐3,4‐cyclohexenones through Direct and Convenient Synthesis from Cyclohexenone‐MBH Alcohol in the Presence of DMAP
作者:Hong‐Xia Ren、Xiang‐Jia Song、Lin Wu、Zhi‐Cheng Huang、Ying Zou、Xia Li、Xiao‐Wen Chen、Fang Tian、Li‐Xin Wang
DOI:10.1002/ejoc.201801301
日期:2019.1.31
An unexpected new reaction of cyclohexenone‐MBH alcohol catalyzed by DMAP has been successfully disclosed to prepare a series of substituted (E)‐2‐methylene‐3,4‐cyclohexenones in excellent yields (up to 93 %) under convenient reaction conditions. Scale‐up preparation and synthetic transformations have been conducted.
Aldol Reaction of Aluminium Enolate Resulting from 1,4-Addition of R<sub>2</sub>AlX to α,β-Unsaturated Carbonyl Compound. A 1-Acylethenyl Anion Equivalent
Organoaluminium reagents R2AlX (X=SPh, SeMe) easily add to α,β-unsaturated carbonyl compounds in 1,4-fashion. The resulting aluminium enolates react with aldehydes to give aldol adducts in fair to good yields. Formal elimination of HX from the adducts provides α-substituted α,β-unsaturated carbonyl compounds. The overall transformation is an addition of aldehydes to 1-acylethenyl anion equivalent. Diethylaluminium iodide also is found to be an efficient reagent for the same type transformation.
Imidazole-catalysed Baylis–Hillman reactions: a new route to allylic alcohols from aldehydes and cyclic enones
作者:Rafik Gatri、Mohamed Moncef El Gaı̈ed
DOI:10.1016/s0040-4039(02)01515-0
日期:2002.10
An efficient one-pot synthesis of cyclic Baylis–Hillman adducts is described. An imidazole-catalysed coupling reaction between cyclic enones and both aliphatic and aromatic aldehydes leads to allylicalcohols in moderate to good yields.
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