635-90-5Relevant articles and documents
Synthesis of pyrrole by 1,5,3,7-diazadiphosphocine-1,5-dicarboxylic acid as acid catalyst
Lee,Lee,Jung,Hahn
, p. 2257 - 2259 (2015)
As a part of research program related to the synthetic study of pharmacologically interesting compounds and good chelating agent for transition metal ion, we here report the synthesis of an unusual medium-sized ring heterocyclic ligand with mixed carboxylic-amino-phosphonic donating group. We have synthesized 3,7-dihydroxy-3,7-dioxoperhydro-1,5,3,7-diazadiphosphocine-1,5-diacetic acid (1a), 2-[5-(1,2-dicarboxyethyl-3,7-dihydroxy-3,7-dioxo-3[1,5,3,7]diazadiphosphocan-1-yl)-succinic acid (1b) and 3,7-dihydroxy-3,7-diox-operhydro-1,3,5,7-diazadiphosphocine-1,5-di-(2-glutaric acid) (1c). In order to analyze reactivity of synthesized dicarboxylic acids 1a-c as acid catalysts, we tried reactions of pyrrole formation according to acid variation. We know that the catalytic ability of synthesized dicarboxylic acids (1a-c) are very good at pyrrole formation reaction.
A solvent-free manganese(II) -catalyzed Clauson-Kaas protocol for the synthesis of N-aryl pyrroles under microwave irradiation
Anilkumar, Gopinathan,Meera, Gopinadh,Rohit, Kizhakkekuttu Radhakrishnan
supporting information, (2021/10/12)
The first manganese-catalyzed modified Clauson-Kaas reaction for N-substituted pyrrole synthesis using 2,5-dimethoxytetrahydrofuran with variously substituted aromatic amines has been developed (up to 89% yield). This interesting neat strategy is free from additives including co-catalysts, ligands, and acids. Relatively low cost, environmentally benign, and handy Mn(NO3)2·4H2O is employed as the catalyst under microwave conditions with a very short reaction time (20?min). The above qualities attest to the green nature of this reaction.
Utilization of caffeine carbon supported cobalt catalyst in the tandem synthesis of pyrroles from nitroarenes and alkenyl diols
Balasubramaniam, Bhuvaneshwari,Dhara, Partha,Gupta, Raju K.,Kundu, Sabuj,Panja, Dibyajyoti,Sau, Anirban
, p. 244 - 254 (2021/09/07)
Employing bio-waste caffeine carbon-supported heterogeneous cobalt catalyst, synthesis of various substituted pyrrole derivatives is reported. In this methodology, pyrroles were synthesized through coupling between nitroarenes and alkenyl diols in a tandem manner. Among all the heterogeneous catalysts Co(OAc)2-CC-800 displayed the highest catalytic activity. Preparative scale synthesis of pyrroles and synthesis of anti-tubercular agent 5-(4-(1H-pyrrol-1-yl)phenyl)-1,3,4-oxadiazole-2-thiol revealed the practical applicability of this protocol. Several kinetic experiments and Hammett studies were conducted to understand the probable mechanism and electronic effects on this transformation.
