A diastereoselective palladium-catalyzed domino Heck/arylborylation of aryl iodides yielding an alkylboronate containing a chroman is reported. The generated alkylpalladium(II) intermediate is intercepted with bis(pinacolato)diboron (B(2)pin(2)) in good yield as a single diastereomer.
A diastereoselective palladium-catalyzed domino Heck/arylborylation of aryl iodides yielding an alkylboronate containing a chroman is reported. The generated alkylpalladium(II) intermediate is intercepted with bis(pinacolato)diboron (B(2)pin(2)) in good yield as a single diastereomer.
Allyl-, Allenyl-, and Propargyl-Transfer Reactions through Cleavage of CC Bonds Catalyzed by an N-Heterocyclic Carbene/Copper Complex: Synthesis of Multisubstituted Pyrroles
作者:Masahiro Sai、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1002/anie.201100631
日期:2011.3.28
Cat. in the bag: The pictured copper complex can promote CC bond cleavage through retro‐allylation of homoallyl alcohols to form allylcopper species. This process is applicable to catalytic allylation of aldehydes and imines with homoallyl alcohols. The method has also been extended to regioselective allenylation and propargylation of imines.
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。