Regioselective α-Deuteration of Michael Acceptors Mediated by Isopropylamine in D<sub>2</sub>O/AcOD
作者:Vinod G. Landge、Kendra K. Shrestha、Aaron J. Grant、Michael C. Young
DOI:10.1021/acs.orglett.0c03839
日期:2020.12.18
hydrogen/deuteriumexchange is an important method to access deuterated compounds for chemical and biological studies. Herein is reported the first method for the regioselective α-deuteration of enals and enones. The transformation features D2O and AcOD as deuterium sources and amines as organocatalysts. The deuteration strategy is scalable and works on enals with a variety of substituted arene or heterocycle
特定地点的氢/氘交换是获取用于化学和生物研究的氘化化合物的重要方法。本文报道了第一种对 enals 和 enones 进行区域选择性 α-氘化的方法。转化的特点是 D 2 O 和 AcOD 作为氘源,胺作为有机催化剂。氘化策略是可扩展的,适用于具有各种取代芳烃或杂环基序以及烯酮的 enal。该方法已应用于氘代药物前体的合成。
An efficient synthesis of (E)-α,β-unsaturated ketones and esters with total stereoselectivity by using chromium dichloride
作者:José M. Concellón、Humberto Rodríguez-Solla、Carmen Méjica
DOI:10.1016/j.tet.2006.01.052
日期:2006.4
(E)-α,β-Unsaturatedketones 1 or esters 2 can be obtained with complete stereoselectivity by reaction of different 2-chloro-3-hydroxy ketones 3 or esters 4 and CrCl2. A comparative study of the results of synthesis of ketones 1 with CrCl2 or samarium is performed. A mechanism to explain both β-elimination reactions has been proposed.
Cationic Rhodium(I)/Bisphosphane Complex-Catalyzed Isomerization of Secondary Propargylic Alcohols to α,β-Enones
作者:Ken Tanaka、Takeaki Shoji、Masao Hirano
DOI:10.1002/ejoc.200700071
日期:2007.6
alcohols to α,β-enones. A kinetic resolution of secondary propargylic alcohols proceeded with moderate selectivity with [Rh((R)-BINAP)]OTf as a catalyst. Mechanistic studies revealed that the isomerization proceeds through intramolecular 1,3- and 1,2-hydrogen migration pathways. The isomerization of propargylic diol derivatives was also investigated, which revealed that 1,4-diketones, furans, and α,β-enones
An efficient and green synthesis of novel highly functionalized nitrogen-fused pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives using recyclable choline hydroxide
作者:Suresh Kumar Krishnammagari、Yeon Tae Jeong
DOI:10.1007/s11164-018-3558-y
日期:2018.12
has been found to be a green and efficient basic ionic liquid catalyst for the synthesis of highly functionalized pyrido[2′,3′:3,4]pyrazolo[1,5-a]pyrimidine derivatives through the reaction of a series of α,β-unsaturated ketones with 1H-pyrazolo[3,4-b]pyridin-3-amine under neat conditions. A series of α,β-unsaturated ketones with different substituted functional groups efficiently were converted to their
摘要 已发现胆碱氢氧化物(ChOH)是一种绿色高效的碱性离子液体催化剂,可通过以下反应合成高度官能化的吡啶并[2',3':3,4]吡唑并[1,5- a ]嘧啶衍生物。在纯条件下用1 H-吡唑并[3,4- b ]吡啶-3-胺形成的一系列α,β-不饱和酮。一系列α,β高效地将具有不同取代官能团的不饱和酮转化为相应的产物,分离产率高至优异,反应可轻松放大至几克。本发明对环境无害且可重复使用的ChOH催化剂具有几个优点,例如反应时间更短,官能团耐受性范围广以及通过简单的实验和后处理程序即可获得高产率的产物。 图形概要 该方法的主要特点是绿色反应,操作简便,可重复使用,易操作性强,ChOH效率高。
Oxidative Conversion of Silyl Enol Ethers to α,β-Unsaturated Ketones Employing Oxoammonium Salts
The oxidative conversion of silylenolethers to α,β-unsaturated ketones using a less-hindered class of oxoammonium salts (AZADO+BF4–) is described. The reaction proceeds via the ene-like addition of oxoammonium salts to silylenolethers.