Pd(0) catalyzed intramolecular Heck reaction: a versatile route for the synthesis of 2-aryl substituted 5-, 6-, and 7-membered O-containing heterocycles
作者:Shubhankar Samanta、Hemakesh Mohapatra、Rathin Jana、Jayanta K. Ray
DOI:10.1016/j.tetlet.2008.09.162
日期:2008.12
An efficient and convenient method for the synthesis of 2-aryl substituted tetrahydropyran, tetrahydrofuran, and oxepine derivatives via intramolecular palladium catalyzed cyclization is developed. The two exo-cyclic double bonds at adjacent carbon atoms in these ring systems could serve as potential dienes for cycloadditionreactions.
Synthesis of 2-hydroxytetrahydrofurans by Wacker-type oxidation of 1,1-disubstituted alkenes
作者:Rina Tanaka、Saki Komori、Yuhei Shimizu、Yasutaka Kataoka、Yasuyuki Ura
DOI:10.1039/d1ob02277f
日期:——
1,1-Disubstituted alkenes feature high steric hindrance, which renders their Wacker-type oxidation difficult. We demonstrate the stereoselective synthesis of 2-hydroxytetrahydrofurans via the Wacker-type oxidation of 3-methyl-3-buten-1-ols by using a PdCl2(MeCN)2/NO/BQ catalyst system under 1 atm O2 in H2O or H2O/DMF.
1,1-二取代烯烃具有高位阻,这使得它们的瓦克型氧化变得困难。我们通过使用 PdCl 2 (MeCN) 2 /NO/BQ 催化剂体系在 H 2中的 1 atm O 2下通过Wacker 型氧化 3-methyl-3-buten-1-ols展示了 2-羟基四氢呋喃的立体选择性合成。O或H 2 O/DMF。
From Building Blocks to Catalysts: The Underinvestigated Potential of Boronic Acid Esters
作者:Ava Bousselat、Jacques Rouden、Jérôme Blanchet
DOI:10.1021/acs.joc.4c00775
日期:2024.8.2
Lewis acids are crucial in chemistry, with applications in pharmaceuticals, agrochemicals, and materials science. In main-group chemistry, they offer alternatives to transition metals, prompting our study of halogenated boronicacid esters (BAEs). Although BAEs are well-known, their catalytic potential has been overlooked. Our investigation found their Lewis acidity superior to that of boron trifluoride