One-pot two-step synthesis of 4-vinylphenols from 4-hydroxy substituted benzaldehydes under microwave irradiation: a new perspective on the classical Knoevenagel–Doebner reaction
作者:Arun K. Sinha、Anuj Sharma、Bhupendra P. Joshi
DOI:10.1016/j.tet.2006.11.023
日期:2007.1
The classical Knoevenagel–Doebner reaction is reinvestigated wherein the direct synthesis of substituted 4-vinylphenols instead of the expected 4-hydroxycinnamic acids is described. The condensation reaction is performed on 4-hydroxy substituted benzaldehydes and malonic acid with a mixture of acetic acid–piperidine as condensing agent under focused microwave irradiation. The occurrence of simultaneous
Vanadium-Catalyzed Selective Oxidative Homocoupling of Alkenyl Phenols To Synthesize Lignan Analogs
作者:William C. Neuhaus、Adriana L. Jemison、Marisa C. Kozlowski
DOI:10.1021/acscatal.9b02608
日期:2019.12.6
subsequent trapping of the resulting quinone methide with a variety of oxygen and nitrogennucleophiles was achieved. Both β-β and β-O coupling isomers can be synthesized via either C-C coupling and two nucleophilic additions of one water molecule (β-β isomer) or C-O coupling followed by one nucleophilic addition of a water molecule (β-O isomer), respectively. Selectivity between these outcomes was achieved