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。
Ligand-controlled iridium-catalyzed semihydrogenation of alkynes with ethanol: highly stereoselective synthesis of <i>E</i>- and <i>Z</i>-alkenes
作者:Jinfei Yang、Chengniu Wang、Yufeng Sun、Xuyan Man、Jinxia Li、Fei Sun
DOI:10.1039/c8cc09714c
日期:——
iridium-catalyzed semihydrogenation of alkynes to E- and Z-alkenes with ethanol was developed. Effective selectivity control was achieved by ligand regulation. The use of 1,2-bis(diphenylphosphino)ethane (DPPE) and 1,5-cyclooctadiene (COD) was critical for the stereoselective semihydrogenation of alkynes. The general applicability of this procedure was highlighted by the synthesis of more than 40 alkenes, with
<i>N</i>-Methylphenothiazine <i>S</i>-Oxide Enabled Oxidative C(sp<sup>2</sup>)–C(sp<sup>2</sup>) Coupling of Boronic Acids with Organolithiums via Phenothiaziniums
we report the development of a transition-metal-free oxidative C(sp2)–C(sp2) coupling of readily available boronic acids and organolithiums via phenothiazinium ions. Various biaryl, styrene, and diene derivatives were obtained using this reaction system. The key to this process is N-methylphenothiazine S-oxide (PTZSO), which allows efficient conversion of boronic acids to phenothiazinium ions. The mechanism
Novel Carbazole‐Based<i>N</i>‐Heterocyclic Carbene Ligands to Access Synthetically Relevant Stilbenes in Pd‐Catalyzed Coupling Processes
作者:Tejpalsingh Ramsingh Girase、Anant R. Kapdi
DOI:10.1002/asia.201900419
日期:2019.8
A series of new carbazole‐based N‐heterocyclic carbene (NHC) ligands have been synthesized in a simple and facile synthetic route and subsequently used in a Pd/carbazole‐based NHC catalytic system, which was found to be effective in catalyzing Heck reactions to provide substituted stilbene derivatives in good yields. Several bioactive stilbenes, including pterostilbene, pinosylvin, trimethoxy resveratrol
One-Pot Dual Catalysis of a Photoactive Coordination Polymer and Palladium Acetate for the Highly Efficient Cross-Coupling Reaction via Interfacial Electron Transfer
charge generation was synthesized via a solvothermal reaction. The synthesized CP was successfully applied to the photocatalytic C–C cross-couplingreaction via the one-pot dual-catalysis method, in combination with the simple and ligand-free palladium salt of Pd(OAc)2 as a metal catalyst. The reaction features a short reaction time, mild reaction conditions, good recyclability, and a high yield of