Development and Elucidation of a Pd‐Based Cyclization–Oxygenation Sequence for Natural Product Synthesis
作者:Heng Yi、Pengfei Hu、Scott A. Snyder
DOI:10.1002/anie.201913730
日期:2020.2.10
recent discovery of one such reaction in the course of a total synthesis program, we delineate herein that it has significant strength, both in terms of substrate scope as well as the terminating oxygen nucleophile. As a result, the reaction proved critical in achieving total syntheses of two oxygenated naturalproducts, one of which was prone to over-oxidation. Finally, a mechanistic proposal that accounts
Visible-Light Photoredox-Catalyzed Decarboxylative Alkylation of Heteroarenes Using Carboxylic Acids with Hydrogen Release
作者:Wan-Fa Tian、Chun-Hong Hu、Ke-Han He、Xiao-Ya He、Yang Li
DOI:10.1021/acs.orglett.9b02539
日期:2019.9.6
Herein, we have developed visible-lightphotoredox-catalyzed decarboxylating carboxylic acids for alkylation of heteroarenes under mild conditions. The transformation occurred smoothly without the requirement of stoichiometric oxidants in the presence of 0.3 equiv of base, which benefited from the release of hydrogen (H2) and carbon dioxide (CO2). Various substrates and functional groups were tolerated
Recognition of Carboxylate Anions and Carboxylic Acids by Selenium-Based New Chromogenic Fluorescent Sensor: A Remarkable Fluorescence Enhancement of Hindered Carboxylates
作者:Shyamaprosad Goswami、Anita Hazra、Rinku Chakrabarty、Hoong-Kun Fun
DOI:10.1021/ol901737s
日期:2009.10.1
new fluorescence sensor 5-pivaloylamino-1,2,5-selenodiazolo[3,4-d]pyrimidin-7-(6H)-one (receptor 1) has been reported for the recognition of monocarboxylic acids and carboxylate anions both by UV−vis and fluorescence methods. Receptor 1 recognizes carboxylate anions more than monocarboxylic acids and it is a selective sensor for carboxylates with specially hindered carboxylate anions. The changes of
据报道,基于硒金属的新型荧光传感器5-新戊酰氨基-1,2,5-硒代二氮杂[3,4- d ]嘧啶-7-(6 H)-one(受体1)可识别单羧酸和通过UV-vis和荧光方法均可羧酸化阴离子。受体1比单羧酸更能识别羧酸根阴离子,它是具有特殊受阻羧酸根阴离子的羧酸根的选择性传感器。在庞大的羧酸根阴离子存在下,荧光强度的变化随着红移而显着增强。已经报道了具有新戊酸的受体1的X射线晶体结构。