Ruthenium-catalyzed selective synthesis of monoalkylated barbituric acids through “borrowing hydrogen” methodology
作者:Anggi Eka Putra、Yohei Oe、Tetsuo Ohta
DOI:10.1016/j.tetlet.2017.01.070
日期:2017.3
An environmentally benign alkylation of barbituric acids via “borrowing hydrogen” process with ruthenium catalysis has been established. The corresponding 5-(alkyl)barubituric acids were obtained in good to excellent yields with low catalyst loading. Various substrates including aliphatic alcohols were tolerated in the present catalytic system. A novel method for construction of barbituric acid-fused
作者:Oleg V. Bityukov、Andrey S. Kirillov、Pavel Yu. Serdyuchenko、Maria A. Kuznetsova、Valentina N. Demidova、Vera A. Vil’、Alexander O. Terent'ev
DOI:10.1039/d2ob00343k
日期:——
The electrochemical thiocyanation of barbituricacids with NH4SCN was disclosed in an undivided cell under constant current conditions. The electrosynthesis is the most efficient at a record high current density (janode ≈50–70 mA cm−2). NH4SCN has a dual role as the source of the SCN group and as the electrolyte. Electrochemical thiocyanation of barbituricacids starts with the generation of (SCN)2
巴比妥酸与 NH 4 SCN 的电化学硫氰化反应在恒流条件下的未分隔电池中进行了公开。在创纪录的高电流密度( j阳极≈50–70 mA cm -2)下,电合成效率最高。NH 4 SCN 作为SCN基团的来源和作为电解质具有双重作用。巴比妥酸的电化学硫氰化反应始于 (SCN) 2的生成来自硫氰酸根阴离子。将硫氰加成到巴比妥酸的烯醇互变异构体的双键上,得到硫氰化巴比妥酸。各种具有不同官能团的硫氰化巴比妥酸以 18-95% 的收率获得,并显示出有希望的抗真菌活性。
Chemical modification of plant alkaloids. I. Aminomethylation of barbituric acid derivatives by cytisine
作者:K. A. Krasnov、V. G. Kartsev、A. S. Gorovoi
DOI:10.1007/bf02236429
日期:2000.3
Reaction of cytisine with 1-mono- and 1,3-disubstituted 5-arylmethylbarbituric acids in the presence of formaldehyde results in aminomethylation of C-5 to form the corresponding 5-cytisylmethylbarbituric acids. The structures of the products are found using PMR spectroscopy mid mass spectrometry. 1-Phenyl-5-(2,4-dimethoxybenzyl)-5-cytisylmethylbarbituric acid is obtained as a mixture of two steroisomers in an approximately 2:1 ratio.