Chemical modification of plant alkaloids. I. Aminomethylation of barbituric acid derivatives by cytisine
摘要:
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.
Chemical modification of plant alkaloids. I. Aminomethylation of barbituric acid derivatives by cytisine
摘要:
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.
Sequential one-pot bimetallic Ir(<scp>iii</scp>)/Pd(<scp>0</scp>) catalysed mono-/bis-alkylation and spirocyclisation processes of 1,3-dimethylbarbituric acid and allenes
Microwave assisted indirect functionalization of alcohols with 1,3-dimethylbarbituric acid followed by spirocyclisation employing a sequential one-pot Ir(III)/Pd(0) catalysed process, involving the formation of three new C–C bonds, one spirocyclic ring and one di- or tri-substituted exocyclic alkene, is described.
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
Iridium supported on porous polypyridine-oxadiazole as high-activity and recyclable catalyst for the borrowing hydrogen reaction
作者:Jiahao Li、Anruo Mao、Wei Yao、Haiyan Zhu、Dawei Wang
DOI:10.1039/d2gc00190j
日期:——
HRTEM, SEM, and XPS, and revealed high catalytic activity for the reaction of dimethyl-6-aminouracil with benzylalcohols, 1,3-dimethylbarbituric acid with benzylalcohols and 2-aminobenzylamine and benzylalcohols through dehydrogenation and the borrowinghydrogenstrategy with alcohol or water as the solvent. In addition, this PPO-Ir catalyst could be recycled and reused without a manifest loss of
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.