Synthesis of Deuterated (<i>E</i>)-Alkene through Xanthate-Mediated Hydrogen–Deuterium Exchange Reactions
作者:Jiaming Li、Jian Li、Xiaoliang Ji、Runfa He、Yang Liu、Zebin Chen、Yubing Huang、Qiang Liu、Yibiao Li
DOI:10.1021/acs.orglett.1c02600
日期:2021.10.1
Herein we have developed a reversible hydrogen–deuteriumexchange reaction of nonactivated olefins. By using EtOCS2K as a mediator, the H/D exchange reaction was realized through repeated addition and elimination reactions, demonstrating reversible H/D exchange between ordinary olefins and deuterated olefins. Using the lowest cost D2O without precious metal catalysts and ligands, a broad spectrum of
在此,我们开发了非活化烯烃的可逆氢-氘交换反应。以EtOCS 2 K为介体,通过反复加成和消去反应实现H/D交换反应,证明了普通烯烃和氘化烯烃之间的H/D交换是可逆的。在没有贵金属催化剂和配体的情况下使用最低成本的 D 2 O,实现了广泛的官能团兼容性。
ALPHA-SYNUCLEIN LIGANDS
申请人:Washington University
公开号:US20170189566A1
公开(公告)日:2017-07-06
The present invention generally relates to various compounds that are useful as α-synuclein ligands. The invention further relates to methods of using these compounds and their radiolabeled analogs for the detection of synucleinopathies, including Parkinson's disease (PD).
Synthesis and solvatochromism of some dipolar aryl-phosphonium and -phosphine oxide systems
作者:David W Allen、Josephine P Mifflin、Peter J Skabara
DOI:10.1016/s0022-328x(00)00085-1
日期:2000.4
with a study of their course of alkalinehydrolysis, which provides a convenient synthetic route to related dipolar phosphine oxides. The phosphonium salts exhibit a modest degree of negative solvatochromism, whereas the related phosphine oxides show a small positive solvatochromic effect. In the case of the ferrocenyl systems, the electronic effects of the phosphorus acceptor group on the ferrocene
Substituent dependent photochemical rearrangements of halostyrylheterocycles in acid media
作者:Jinn-Hsuan Ho、Tong-Ing Ho
DOI:10.1016/s0040-4039(03)01056-6
日期:2003.6
New photorearrangement product 2 and hydrolysis product 3 are obtained by irradiating acidic halostyrylheterocycles 1a–f. The competing formal [1,3]hydrogen shift and ring opening of dihydrophenanthrene intermediate is responsible for the product formation. The halogen substituenteffect on the product distribution has been studied. Photolysis of 5 can reversibly be converted to 2. Similar photoreactivity
Synthesis and Characterization of a New Chiral Pentacyclic Phosphine
作者:Souad Moussa、Faouzi Aloui、Béchir Ben Hassine
DOI:10.1080/00397911.2011.596986
日期:2013.1
Abstract A new helically chiral pentacyclic phosphine, containing one thiophene ring, was prepared in good yield and purity via a five-step sequence involving a Wittig reaction, a palladium-catalyzed Mizoroki–Heck coupling, and classical oxidative photocyclization reactions. The investigation using ultraviolet–visible spectroscopy shows that the helicene precursor of the target helical phosphine as well