Design of 1,2-dioxines with anti-Candida activity: aromatic substituted 1,2-dioxines
摘要:
In an ongoing effort to rationally design new antimicrobials, 47 new 1,2-dioxines have been synthesised. Broad antifungal structure-activity relationships governing aromatically substituted epoxy-1,2-dioxines 2 and 3 and their parent 1,2-dioxines 1 were assessed primarily against the pathogenic yeast, Candida albicans, with haemolytic activity of selected examples also reported. (c) 2007 Elsevier Ltd. All rights reserved.
Highly-functionalized pyrroles could be effectively synthesized from 3,6-dihydro-1,2-oxazines using a heterogeneous copper on carbon (Cu/C) under neat heating conditions. Furthermore, the in situ formation of 3,6-dihydro-1,2-oxazines via the hetero Diels–Alder reaction between nitroso dienophiles and 1,3-dienes and the following Cu/C-catalyzed pyrrolesynthesis also provided the corresponding pyrrole derivatives
Rhodium(<scp>iii</scp>) <i>vs.</i> cobalt(<scp>iii</scp>): a mechanistically distinct three-component C–H bond addition cascade using a Cp*Rh<sup>III</sup> catalyst
作者:Ruirui Li、Cheng-Wei Ju、Dongbing Zhao
DOI:10.1039/c8cc08792j
日期:——
Three-component C–H bond additions across two different coupling partners remain underdeveloped. Herein, we report the first three-component RhIII-catalyzed C–H bond additions to a wide range of dienes and aldehydes. Our method constitutes a complementary access with Ellman's CoIII-catalytic system to homoallylic alcohols.
The unique property of hexafluoroisopropanol (HFIP) enables the regioselective hydroamination of 1,3-dienes with nitrogen heterocycles in a Markovnikov manner in the presence of catalytic Brønsted acid. This transition-metal-free intermolecular hydroamination protocol is achieved under mild reaction conditions. The aggregation by HFIP and Brønsted acid helps to activate the terminal double bond regioselectively
Cu-Catalyzed Enantioselective Reductive Coupling of 1,3-Dienes and Aldimines
作者:Mingfeng Li、Jiping Wang、Fanke Meng
DOI:10.1021/acs.orglett.8b03216
日期:2018.11.16
3-disubstituted allyl–Cu complexes from a Cu–H addition to 1,3-dienes followed by in situ reactions with aldimines to construct homoallylic amines is presented. The method is distinguished by an unprecedented pathway to generate enantiomerically enriched allyl–Cu species, allowing reactions with a wide range of aldimines in high chemo-, site-, diastereo-, and enantioselectivity. Functionalization provides useful
CuH-Catalyzed Enantioselective Reductive Coupling of 1,3-Dienes and Trifluoromethyl Ketoimines or α-Iminoacetates
作者:Xue-Hua Deng、Jia-Xi Jiang、Qin Jiang、Ting Yang、Bo Chen、Long He、Wen-Dao Chu、Cheng-Yu He、Quan-Zhong Liu
DOI:10.1021/acs.orglett.2c01683
日期:2022.7.1
The intermolecular addition of allylic copper species generated from diene and copper hydride remains elusive. Herein copper hydride catalyzed asymmetric cross reductive coupling of conjugated dienes and ketoimines including trifluoromethyl ketoimines and α-iminoacetates was first achieved using chiral Ph-BPE as the ligand, providing rapid access to structurally and optically enriched homoallylic amines
由二烯和氢化铜产生的烯丙基铜物质的分子间加成仍然难以捉摸。在这里,氢化铜催化的共轭二烯和酮亚胺(包括三氟甲基酮亚胺和 α-亚氨基乙酸酯)的不对称交叉还原偶联首次使用手性 Ph-BPE 作为配体实现,提供了快速获得结构和光学富集的均烯丙基胺,该胺含有两个邻位立体中心,最高可达95% 产率、99% ee 和 11:1 非对映选择性。