A convenient one-pot two-step synthesis of pyrazolylphosphonates from ethynylphosphonate
作者:Alexander Yu. Mitrofanov、Irina P. Beletskaya
DOI:10.1016/j.mencom.2021.07.033
日期:2021.7
A convenient one-pot preparation of pyrazol-3-ylphosphonates involves Cu-catalyzed cross-coupling of acyl chlorides with diethyl ethynylphosphonate followed by heterocyclization with hydrazine.
Selenium-π-Acid Catalyzed Oxidative Functionalization of Alkynes: Facile Access to Ynones and Multisubstituted Oxazoles
作者:Lihao Liao、Hang Zhang、Xiaodan Zhao
DOI:10.1021/acscatal.8b01595
日期:2018.7.6
Unprecedented selenium-catalyzed propargylic oxidation of alkynes is disclosed. Various propargylphosphonates and 3-alkynoates were efficiently converted to valuable ynones via unusual C–C triple bond migration and deselenenylation at a vinyl carbon. By the strategies of tautomerization of enamine intermediate and SN2 displacement, similar conditions were effective for the oxidative difunctionalization
公开了前所未有的硒催化炔烃的炔丙基氧化。各种炔丙基膦酸酯和3-链烷酸酯通过不寻常的CC三键迁移和乙烯基碳上的硒烯基化反应,有效地转化为有价值的炔酮。通过烯胺中间体的互变异构和S N 2置换的策略,相似的条件对于乙酰胺的氧化双官能化有效,从而提供了具有高区域选择性的多取代恶唑。机理研究揭示了这些详细的过程。
Denitrogenative dismantling of heteroaromatics by nucleophilic substitution reactions with diazomethyl compounds
作者:Soumen Biswas、Claire Empel、Luis Mario Sanchez-Palestino、Hadi Arman、Rene M. Koenigs、Michael P. Doyle
DOI:10.1039/d4sc01578a
日期:——
Nucleophiles from deprotonation of diazomethyl compounds having diverse electron withdrawing groups react with 4-carboxylato-1,2,3-triazines at the 6-position to extrude dinitrogen and produce diazovinylketoesters compounds with five or six linear contiguous sp2-hybridized carbons, whereas these same nucleophiles react with 4-carboxylato-1,2,3-triazine 1-oxides, also at the 6-position, to form pyrazolines
[EN] PHOSPHINE LIGANDS FOR CATALYTIC REACTIONS<br/>[FR] LIGANDS PHOSPHINE POUR RÉACTIONS CATALYTIQUES
申请人:ABBOTT LAB
公开号:WO2012009698A1
公开(公告)日:2012-01-19
The disclosure is directed to: (a) phosphacycle ligands; (b) methods of using such phosphacycle ligands in bond forming reactions; and (c) methods of preparing phosphacycle ligands.