Diphenyl diselenide (PhSeSePh) was effective as a pre-catalyst for the vicinal dichlorination of α,β-unsaturated phosphonates with sulfuryl chloride. The reaction conditions were mild and the desired products were formed in up to 93% yield and moderate diastereoselectivity (10 : 1). The important diphenylselenium dichloride intermediate was obtained and characterized by X-ray crystallography.
reusable Pd-catalyzed mono and double Mizoroki–Heckreactions of aryl halides and dialkyl vinylphosphonates using iPr2NH as a base in aqueous medium under air were developed. For aryl iodides, the reaction could be conducted at 80 °C under a low catalyst loading (0.1–1 mol%). When aryl bromides were applied, however, a greater amount of catalyst (5 mol%) and a longer reaction time at 120 °C were required.
Synthesis and Characterization of Pd exchanged MMT Clay for Mizoroki-Heck Reaction
作者:Vivek Srivastava
DOI:10.1515/chem-2018-0065
日期:2018.6.20
cation exchange process. We characterized all the synthesized Pd@MMT clays using sophisticated analytical techniques before testing them as a heterogeneous catalyst for the Mizoroki - Heck reaction (mono and double). The highest yield of the Mizoroki-Heck reaction product was recovered using thermally stable and highly reactive Pd@ MMT-1 clay catalyst in the functionalized ionic liquid reaction medium
Synthesis of α-Aminophosphonates by Umpolung-Enabled Cu-Catalyzed Regioselective Hydroamination
作者:Shogo Nakamura、Soshi Nishino、Koji Hirano
DOI:10.1021/acs.joc.2c02632
日期:2023.1.20
A copper-catalyzed regioselective hydroamination of α,β-unsaturated phosphonates has been developed to form corresponding α-aminophosphonates of interest in medicinal chemistry. The introduction of an umpolung, electrophilic amination strategy with the hydroxylamine derivative is the key to achieving the α-amination regioselectivity, which is otherwise difficult under the conventional nucleophilic