Total Synthesis of Natural p-Quinol Cochinchinenone
摘要:
Cochinchinenone has been synthesized in only five steps and four pots and in 58% overall yield from commercially available 2,3-dimethoxy-4-hydroxy-benzaldehyde and OPMB-protected p-hydroxy acetophenone, the key step being the oxone-mediated oxidative dearomatization of the corresponding ketone-containing p-substituted phenol.
Visible-Light-Promoted Photocatalyst-Free Hydroacylation and Diacylation of Alkenes Tuned by NiCl<sub>2</sub>·DME
作者:Xinxin Zhao、Bing Li、Wujiong Xia
DOI:10.1021/acs.orglett.9b04595
日期:2020.2.7
4-dihydropyridines via an acyl radical addition and hydrogen atom transfer pathway under photocatalyst-free conditions. The efficiency was highlighted by wide substrate scope, good to high yields, successful scale-up experiments, and expedient preparation of highly functionalized ketone derivatives. In addition, this protocol allows for the synthesis of 1,4-dicarbonyl compounds through alkene diacylation in the presence
A new decarboxylative Csp3-Csp3 coupling approach for the benzylation of ketone enolates has been developed. A variety of raspberry ketone derivatives were conveniently synthesized in good to excellent yields under...
Ketone Synthesis by Direct, Orthogonal Chemoselective Hydroacylation of Alkenes with Amides: Use of Alkenes as Surrogates of Alkyl Carbanions
作者:Hui Geng、Pei‐Qiang Huang
DOI:10.1002/cjoc.201900252
日期:2019.8
and direct transformation of carboxamides are two exciting areas that have attracted considerable attention in recent years. We report herein that secondaryamides, the least reactive derivatives of carbonyl compounds, upon activated with triflic anhydride, can serve as effective hydroacylating reagents in partner with alkenes to yield ketones at ambient temperature. The method was applied to the one‐step
Unveiling the Reactivity of Propargylic Hydroperoxides under Gold Catalysis
作者:Benito Alcaide、Pedro Almendros、M. Teresa Quirós、Ramón López、María I. Menéndez、Aleksandra Sochacka-Ćwikła
DOI:10.1021/ja3108966
日期:2013.1.16
Controlled gold-catalyzed reactions of primary and secondary propargylic hydroperoxides with a variety of nucleophiles including alcohols, phenols, 2-hydroxynaphthalene-1,4-dione, and indoles allow the direct and efficientsynthesis of β-functionalized ketones. Moreover, the utility of some of the resulting products for the selective preparation of fused polycycles has been demonstrated. In addition
伯和仲炔丙基氢过氧化物与各种亲核试剂(包括醇、酚、2-羟基萘-1,4-二酮和吲哚)的受控金催化反应允许直接有效地合成 β-官能化酮。此外,已经证明了一些所得产物用于选择性制备稠合多环的效用。此外,还进行了密度泛函理论 (DFT) 计算和 (18) O 标记实验,以深入了解炔丙基氢过氧化物与外部亲核试剂在金催化下的受控反应性的各个方面。
USE OF 3-(3-HYDROXY-4-METHOXY-PHENYL)-1-(2,4,6-TRIHYDROXY-PHENYL) PROPAN-1-ONE
申请人:SYMRISE AG
公开号:US20190343777A1
公开(公告)日:2019-11-14
The present invention concerns the use of 3-(3-Hydroxy-4-methoxy-phenyl)-1-(2,4,6-trihydroxyphenyl)propan-1-one for masking, reducing or suppressing an unpleasant taste impression, preferably bitter, sour and/or astringent taste impression of unpleasant-tasting substances or mixture of substances, preferably bitter-, sour-, and/or astringent-tasting substances or mixtures of substances, and in particular the bitter taste impression of bitter-tasting substances, and/or modulating the taste impressions selected from the group consisting of cooling, umami, fruity and spicy notes of cooling-, umami-, fruity- or spicy-tasting substances or mixture of substances, and simultaneously intensifying the sweet-taste impression of sweet-tasting substances or mixtures of substances or both sweet- and bitter-tasting tasting substances or mixture of substances.