Regioselective Dihalohydration Reactions of Propargylic Alcohols: Gold-Catalyzed and Noncatalyzed Reactions
作者:Jarryl M. D'Oyley、Abil E. Aliev、Tom D. Sheppard
DOI:10.1002/anie.201405348
日期:2014.9.26
The regioselective conversion of propargylicalcohols into previously unreported α,α‐diiodo‐β‐hydroxyketones was achieved by treatment with N‐iodosuccinimide in the presence of a gold catalyst. The corresponding α,α‐dichloro‐β‐hydroxyketones were obtained by treatment with trichloroisocyanuric acid in the absence of a catalyst. The latter reaction can be extended to other alkynols. These transformations
[EN] 4-HEPTEN-2-YL SALICYLATE AND ITS USE AS FRAGRANCE INGREDIENT<br/>[FR] 4-HEPTENE-2-YLE SALICYLATE ET SON UTILISATION COMME AGENT PARFUMANT
申请人:GIVAUDAN SA
公开号:WO2006007755A1
公开(公告)日:2006-01-26
The present invention is related to 4-hepten-2-yl salicylate and its use as fragrance ingredient.
本发明涉及4-庚烯-2-基水杨酸酯及其作为香料成分的用途。
<i>De Novo</i> Asymmetric Synthesis of Phoracantholide J
作者:Kenneth F. Avocetien、Jiazhen J. Li、Xiaofan Liu、Yanping Wang、Yalan Xing、George A. O’Doherty
DOI:10.1021/acs.orglett.6b02432
日期:2016.10.7
A denovo asymmetric total synthesis of the macrolide natural product (S)-phoracantholide J has been achieved in 10 steps from the commodity chemicals (1-pentyne, ethyl acrylate, acetaldehyde, and hydrogen). The asymmetry of the route was introduced by a Noyori reduction of a 3-yn-2-one, which makes the route equally amenable to the synthesis of either enantiomer. In addition, this route relies upon
Hydrogenation Promoter, Hydrogenation Catalyst, and Process for Producing Alkene Compound
申请人:Hori Junichi
公开号:US20080033221A1
公开(公告)日:2008-02-07
A hydrogenation promoter of the present invention is produced by reacting an alkyne compound or an alkene compound, a palladium compound represented by a general formula Pd(II)X
j
L
k
(where L represents a monodentate ligand or a polydendate ligand other than a phosphorus-containing ligand (when two or more Ls are present in the compound, the Ls may be the same or different), X represents an anionic group, j represents a value determined according to the valence of X so that X
j
has a valence of −2 as a whole, and k represents an integer in the range of 0 to 4), and a base in an organic solvent. Specifically, The hydrogenation promoter of the invention includes palladium nanoparticles containing the alkyne compound or the alkene compound as an agglomeration-preventing agent.
Intramolecular alkyne hydroamidation represents a straightforward approach for the access to synthetically valuable cyclic enamides. Despite some advances made in this realm, the ability to attain a precise regiocontrol still remains challenging, especially for endo cyclization that leads to six-membered and larger azacyclic rings. Herein, we report a NiH-catalyzed intramolecular hydroamidation of
分子内炔烃加氢酰胺化代表了一种获得合成有价值的环状烯酰胺的直接方法。尽管在这一领域取得了一些进展,但获得精确区域控制的能力仍然具有挑战性,特别是对于导致六元和更大氮杂环的内环化。在此,我们报道了一种 NiH 催化的炔基二恶唑酮的分子内加氢酰胺化反应,该反应具有出色的内环选择性,从而提供了范围广泛的六至八元环内烯酰胺。机理研究表明,Ni(I) 催化在当前系统中是有效的,通过区域选择性顺式氢化镍、烯基镍E / Z进行异构化和以 Ni 为中心的内球 Nirenoid 转移。特别是,发现以前缺乏机械理解的关键烯基镍异构化步骤是通过 η 2 -乙烯基过渡态发生的。该协议的合成价值通过将获得的内环烯酰胺非对映选择性修饰为高度功能化的 δ-内酰胺支架来证明。