Synthesis of β-ketophosphonates via AgNO3-catalyzed hydration of alkynylphosphonates: a rate-enhancement effect of methanol
摘要:
beta-Ketophosphonates were prepared via AgNO3-catalyzed hydration of alkynylphosphonates with a dramatic rate-enhancement effect of methanol. This benign aqueous-methanol method catalyzed by a low-(c)ost catalyst has simple, atom-economical procedure, and was used effectively with a wide range of substrates. (C) 2014 Elsevier Ltd. All rights reserved.
The silver‐catalyzed oxidative C(sp3)−H/P−H cross‐coupling of 1,3‐dicarbonyl compounds with H‐phosphonates, followed by a chemo‐ and regioselective C(sp3)−C(CO) bond‐cleavage step, provided heavily functionalized β‐ketophosphonates. This novel method based on a readily available reaction system exhibits wide scope, high functional‐group tolerance, and exclusive selectivity.
A simple and convenient copper‐catalyzed directoxyphosphorylation of enamides with P(O)‐H compounds and dioxygen has been developed under mild conditions. This methodology can allow the synthesis of a series of valuable β‐ketophosphine oxides/β‐ketophosphonates in moderate to good yields with a broad substrate scope simply by using readily‐available starting materials.
Cu/Fe-Cocatalyzed Formation of β-Ketophosphonates by a Domino Knoevenagel-Decarboxylation-Oxyphosphorylation Sequence from Aromatic Aldehydes and H-Phosphonates
作者:Mingxin Zhou、Yao Zhou、Qiuling Song
DOI:10.1002/chem.201501226
日期:2015.7.20
A domino Knoevenagel–decarboxylation–alkene difunctionalization sequence has been developed for the conversion of benzaldehydes into β‐ketophosphonates, catalyzed by a cooperative Cu/Fe system, whereby CP and CO bonds are formed simultaneously in a one‐pot reaction. The reaction proceeds in good yields and with a broad substrate scope and environmentally benign conditions.
Mn(OAc)<sub>3</sub>-Promoted Oxidative C<sub>sp<sup>3</sup></sub>–P Bond Formation through C<sub>sp<sup>2</sup></sub>–C<sub>sp<sup>2</sup></sub> and P–H Bond Cleavage: Access to β-Ketophosphonates
The Mn(OAc)3-promoted oxidative phosphonylation of N,N-dimethylenaminones with H-phosphonates, involving a chemo- and regioselective Csp2–Csp2 bond cleavage and Csp3–P bond formation in one step, provided successfully functionalized β-ketophosphonates under mild reaction conditions. Oxidative Csp3–H/P–H cross-coupling reactions via Csp3–C(C═O) bond cleavage and mechanistic studies are conducted preliminarily
Copper-Catalyzed Microwave-Expedited Oxyphosphorylation of Alkynes with Diethyl Phosphite and <i>t</i>-Butyl Hydroperoxide Synthesis of Densely Functionalized Phosphonylated Indenones
作者:Pablo Macías-Benítez、Alfonso Sierra-Padilla、Manuel J. Tenorio、F. Javier Moreno-Dorado、Francisco M. Guerra
DOI:10.1021/acs.joc.1c01763
日期:2021.12.3
Treatment of alkynes with diethylphosphite and t-butyl hydroperoxide in the presence of [Cu(MeCN)4]BF4 under microwave irradiation produced the oxyphosphorylation of the triple bond, giving rise to the corresponding β-ketophosphonates in moderate-to-good yields. When the triple bond was conjugated to a carbonyl group bearing an aromatic ring, it led to the cyclization of the resulting ketone intermediate